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Large collection of Slide rules and a cased Vernier scale

A FINE GEORGE II/III MAHOGANY MERCURY STICK BAROMETER WITH LARGE SCALE THERMOMETERJOHN BENNETT, LONDON, MID 18th CENTURYThe break-arch case with central brass Classical bust finial over cavetto cornice and hinged brass-framed arch glazed door enclosing silvered Vernier scale calibrated in barometric inches to right hand side opposing the usual observations to the left beneath signature Bennett, LONDON to upper section, the caddy moulded trunk applied with a tall shaped-top silvered Fahrenheit Scale alcohol thermometer incorporating drilled brass shield to the bulb and with annotations ranging from Extreme Cold to Extreme Hot, over rounded base applied with a hemispherical cistern cover and incorporating level adjustment screw to underside.101cm (39.5ins) high overall 16.5cm (6.5ins) wide. Provenance:The Dr. Castle Collection of barometers and other weather instruments. Purchased at Sotheby's, London sale of Important Clocks, Watches & Wristwatches 14th December 2006 (lot 7) for £4,322.50. John Bennett (III) is recorded in Clifton, Gloria Directory of British Scientific Instrument Makers 1550-1851 as gaining his Freedom of the Clockmakers' Company in 1733, and working from Hatton Wall, London, until 1746, when he relocated to Old Bailey before finally moving to Fleet Street in 1751. Nicholas Goodison in ENGLISH BAROMETERS 1680-1860 notes that John Bennett worked up until 1768 and illustrates an undated trade card indicating that he was located at 'The Globe, Crown Court, between St. Ann's, Soho, and Golden Square'. Bennett was a fine maker who held warrants to three members of the Royal Family and most likely had a working relationship with the eminent scientific instrument maker Jonathan Sisson. 

A SCOTTISH GEORGE III CHEVRON-EDGED MAHOGANY MERCURY STICK BAROMETER BALTHAZAR KNIE, EDINBURGH, CIRCA 1800The onion-top chevron-edged case with visible tube and inset with an arched silvered Vernier scale calibrated in barometric inches to the right, opposing the usual observations to the left, beneath banner issuing floral sprays signed KNIE, EDIN'R to the arch, the base with oval lozenge-shaped cistern cover.99cm (39ins) high, 10cm (4ins) wide. Provenance:The Dr. Castle Collection of barometers and other weather instruments. Purchased from The Old Malthouse Antiques, Hungerford, 14th January 1989 for £1,500. Balthazar Knie is recorded in Goodison, Nicholas ENGLISH BAROMETERS 1680-1860 and Banfield, Edwin BAROMETER MAKERS AND RETAILERS 1660-1900 as working in Cork, Ireland from 1773 before moving to Edinburgh in 1776 where he remained until his death in 1817. He was born in Germany and spent several years travelling around Europe demonstrating his skills as a glass blower and barometer maker before finally settling in Edinburgh. He gained a considerable local reputation as a maker and repairer of barometers (and sand glasses including for maritime use). Knie was a notably inventive maker who is perhaps best known for developing a form of angle tube barometer which, by introducing a second acute angle bend into the tube, resulted in a more compact design (see Goodison, page 171, Plate 107); a very similar instrument to the present is illustrated by Goodison on page 175 (plates 112-13). 

Y A FINE GEORGE III FIGURED MAHOGANY BOWFRONTED 'FLAT-TO-THE-WALL' MERCURY STICK BAROMETERRAMSDEN, LONDON, CIRCA 1795With ebonised shouldered urn finial to the concave-sided upstand and cavetto cornice, over rectangular bow-glazed silvered Vernier scale calibrated in barometric inches to the right hand side opposing the usual observations to the left, the lower left corner signed Ramsden, London, the trunk of the same bowed profile incorporating Vernier setting square beneath the cavetto throat moulding over fine figured veneers line-edged in ebony, the base with turned ebonised half vase cistern cover flanked by canted angles inlaid with ebony 'flutes' over cavetto moulded underside.103cm (43ins) high, 11cm (4.25ins) wide.  Jesse Ramsden is recorded in Clifton, Gloria Directory of British Scientific Instrument Makers 1550-1851 as working from several addresses in London 1762 until his death in 1800, however by 1782 both his workshop and principal retail outlet were on Piccadilly. He was one of the finest instrument makers of the period being particularly well known for his invention of a dividing engine and subsequent equatorial telescope stands.  Condition Report: Tube is filled with no apparent airlocks (mercury column will rise all the way to the top of the tube when instrument is tilted). The silvering is in fine condition with nice even colour and the Vernier slide is in working condition. The case is generally in fine condition with faults very much limited to very minor age-related wear. There is no setting key for the Vernier/cistern level included with the instrument. Condition Report Disclaimer

A FINE EARLY VICTORIAN SCOTTISH MAHOGANY BOWFRONTED MERCURY STICK BAROMETERADIE AND SON, EDINBURGH, CIRCA 1835With domed gadroon carved domed caddy surmount over concave cornice and glazed rectangular silvered Vernier scale calibrated in barometric inches to right hand side opposing the usual observations to the left beneath signature Adie & Son, Edinburgh to upper margin, with straight bowfronted trunk beneath terminating in an conforming inverted reeded caddy cistern cover with stepped ogee top mouldings and leafy bud pendant incorporating a level adjustment disc to underside.107cm (42ins) high, 10cm (4ins) wide. Alexander Adie is recorded in Goodison, Nicholas ENGLISH BAROMETERS 1680-1860 as born 1774 and apprenticed to his uncle, the eminent Scottish instrument maker John Miller, in 1789. In 1804 his uncle took him into partnership under the name of Miller and Adie which continued until after Miller's death in 1815. Adie was particularly interested in meteorological instruments and is perhaps best known as the inventor of the Sympiesometer in 1818. In recognition of his work he was elected a Fellow of the Royal Society of Edinburgh in 1819. He was appointed optician to William IV and later Queen Victoria and took one of his sons, John, into partnership in 1835. Two of his other sons set up businesses; Robert in Liverpool and Patrick in London. Unfortunately John Adie was prone to 'fits of despondency' which resulted in him shooting himself in 1857, Alexander Adie died the following year - no doubt expediated by the stress of his son's demise. Condition Report: Instrument is generally in very fine condition. The tube is filled with no apparent airlocks however the mercury column will almost reach the top of the tube when the instrument is reclined slightly suggesting the presence of a very small amount of air. The scale is in fine condition with nice slightly mellowed colour to the silvering; the Vernier slide is in working order. The case is in very fine condition with the only notable fault being some edge wear to the small section of cavetto moulding applied to the left-hand upper edge of the cistern assembly. The finial is probably a replacement; faults are otherwise very much limited to very light age related wear and blemishes. Condition Report Disclaimer

Y A FINE GEORGE III EBONY BANDED MAHOGANY MERCURY STICK BAROMETER WITH HYGROMETERCARY, LONDON, CIRCA 1800The case with swan neck pediment over circular silvered hygrometer annotated DAMP/DRY set behind convex glazed brass bezel, over rectangular brass-framed glazed door enclosing silvered Vernier scale calibrated in barometric inches to right hand side opposing the usual observations to the left beneath signature Cary, London to upper margin, the ebony-banded caddy moulded trunk applied with arch glazed silvered Fahrenheit and Reaumur scale mercury thermometer over circular convex cistern cover to the rounded base incorporating level adjustment screw to underside.108cm (42.5ins) high, 14cm (5.5ins) wide. The celebrated Cary family business of scientific instrument and globe makers was established by John Cary at Johnson's Court, Fleet Street, London in 1782 moving to a new address at 'Corner of Arundel Square', Strand the following year. He was primarily an engraver of maps, charts and globes who moved again in 1783 to 188 Strand. By 1791 he had entered into what appeared to be a relatively casual partnership with his brother, William; this partnership lasted until circa 1816 by which time William and John Cary had moved again to 181 Strand before finally settling in 86 St. James in 1820. The following year he was succeeded by his sons, John (II) and George Cary, who continued from the firm's 181 Strand address until 1851/2 when the business was acquired by Henry Gould. Condition Report: Instrument is in good original condition having been cosmetically restored at some time in the fairly recent past. The tube is filled with mercury however the column stops a little short of the top of the tube when the instrument is tilted slightly suggesting the presence of some air. The register plate has good clean even silvering and. the brass door is in sound condition however we do not have a key for the lock. The thermometer is in fine working condition. The case is generally very good. The pediment appears original but with evidence that some of the ebonised mouldings may have come loose and been re-stuck at some point. Both sides of the case at the cistern level have some slight bruising otherwise faults to the case are limited to minor bumps, scuffs shrinkage and wear commensurate with age and use.Condition Report Disclaimer

A RARE GEORGE III SCOTTISH CHEVRON-EDGED MAHOGANY MERCURY STICK BAROMETERJOHN RUSSELL, FALKIRK, CIRCA 1790The chevron banded case with swan neck pediment above arch-glazed door enclosing fine engraved silvered brass scale with arched banner titled BAROMETER over Vernier scale calibrated in barometric inches to the right and opposing the usual weather observations to the left, the lower margin signed Rufsell, Falkirk, the trunk applied with full-height half column enclosing the tube flanked by forty-five degree angle-grain veneers and chevron angles, over a slightly domed oval cistern cover.98cm (38.5ins) high, 15cm (6ins) wide. Provenance:The Dr. Castle Collection of barometers and other weather instruments. Purchased at Bonhams, London sale of FINE CLOCKS Wednesday 7th July 2016 (lot 2) for £1,690. John Russell is recorded in Goodison, Nicholas ENGLISH BAROMETERS 1680-1860 as settling in Falkirk in 1770 where he set up shop opposite the top of Kirk Wynd. He proved to be a very talented watchmaker who was subsequently appointed maker to the Prince of Wales in 1811. In addition to making watches and barometers he advertised as being able to supply musical clocks, organs, microscopes and thermometers. Of his barometers his best known models are a type similar to the present lot, but also fitted with a hygrometer and thermometer (following the specification of Benjamin Martin's 'weather glasses'), and his landmark 'royal' barometers - which are essentially an early design of wheel barometer with subsidiary dials allowing changes in pressure to be obtained down to increments of 0.001 of an inch. John Russell died in 1817 and was succeeded by William Dobbie who was known to have produced a few barometers to Russell's designs. Condition Report: Instrument is filled with mercury but has a very small amount of air as the column will stop around 5mm short of the top of the tube when the instrument is inclined slightly. The scale is in good condition with fairly bright and relatively even colouring to the silvering. The case presents very well however the pediment has been restored and there is a small veneer patch repair to glazed aperture surround. Visible faults are otherwise visible faults are otherwise limited to a small stain to the lower part of the right hand-side and a few very minor age related bumps, scuffs, shrinkage and wear.Condition Report Disclaimer

Y A REGENCY CHEVRON-BANDED MAHOGANY MERCURY STICK BAROMETERP. CAMINADA, TAUNTON, CIRCA 1820The case with open triangular pediment above rectangular glazed mahogany door enclosing silvered Vernier scale calibrated in barometric inches and with the usual observations to right-hand side opposing spirit Fahrenheit scale thermometer to the left, beneath signature P. Caminada, FECIT to upper margin, with visible tube to the chevron banded caddy moulded trunk over domed circular cistern cover to the rounded base.96.5cm (38ins) high, 13cm (5.25ins) wide. Peter Caminada is recorded in in Banfield, Edwin BAROMETER MAKERS AND RETAILERS 1660-1900 as working in Taunton circa 1820-40. Condition Report: IVORY LICENCE REF - 6MNYFDS5Condition Report Disclaimer

Y A GEORGE III MAHOGANY MERCURY STICK BAROMETERTHOMAS HARRIS AND SON, LONDON, CIRCA 1805The case with open triangular pediment above rectangular glazed mahogany door, enclosing silvered Vernier scale calibrated in barometric inches and with the usual observations beneath signature Tho's Harrs & Son, Opticians to his Majesty to the right-hand side, opposing Fahrenheit scale mercury thermometer to the left, with Vernier adjustment square to throat and visible tube to the caddy moulded trunk over hemispherical cistern cover to the rounded base incorporating level adjustment screw to underside.99cm (39ins) high, 13cm (5ins) wide. Thomas Harris and Son are recorded in Clifton, Gloria Directory of British Scientific Instrument Makers 1550-1851 as a partnership between father and son, both named Thomas, formed in around 1802. Thomas Harris senior is noted as working as an optician, mathematical instrument and globe maker from 1790; and his son from 1802. Both makers are listed as worked from 140 Fleet Street, London in 1804, and then Thomas junior alone at Hyde Street, Bloomsbury in 1808 - having most likely inherited the business from his father who died in 1806. Thomas Harris junior served as a Sargeant in the Bloomsbury Volunteers and died in an unfortunate fire at Covent Garden Theatre in 1808. Condition Report: IVORY LICENCE REF - D2ZGKXV3Instrument is in fine working condition most likely having been cosmetically restored in the recent past. The tube is filled with no apparent air locks and the Vernier slide is operational. The silvering is fairly bright and even in colour. The case is in fine condition with only minor bumps, scuffs and other slight surface blemishes evident.Condition Report Disclaimer

Y A GEORGE III CHEVRON-BANDED MAHOGANY MERCURY STICK BAROMETERSNELLING, ALTON, CIRCA 1800The case with open triangular pediment above rectangular chevron-edged glazed mahogany door incorporating concave lower corners, enclosing silvered Vernier scale calibrated in barometric inches to right-hand side opposing the usual observations to the left beneath signature Snelling, ALTON to upper margin, with visible tube to the chevron banded caddy moulded trunk over domed circular cistern cover to the rounded base.96.5cm (38ins) high, 15cm (5.5ins) wide. Provenance:The Dr. Castle Collection of barometers and other weather instruments. Purchased at Dickens Fine Art Auctioneers, Middle Claydon, sale of the THE RICHARD COOKSON COLLECTION 20th April 2008 (lot 59) for £1,350 hammer. James Snelling is recorded in Banfield, Edwin BAROMETER MAKERS AND RETAILERS 1660-1900 as a clock and watchmaker and silversmith working from High Street, Alton, Hampshire, 1793-1830. Condition Report: Instrument is in fine working condition with tube filled and no apparent airlocks. The register plate has good fairly bright even silvering. The case has some historic worm train damage to the rear upper section (behind the scales) infestation has long gone. Otherwise case is in very good original condition although has been given a coat of polish resulting in a slightly muddy appearance to the surface.Condition Report Disclaimer

Double Frame Sextant, Troughton, LondonEnglish, c.1840, engraved in copperplate script below the scale 'Troughton London', sextant with magnifier to vernier scale, all filters, turned wooden handle, single telescope, finished in black lacquer with lacquered brass scale, 30cm tall

Box Sextant, Hicks, LondonEnglish, c.1890, engraved 'J. Hicks 8, 9 & 10 Hatton Garden, London', of typical form with screw in telescope, platinum scale with vernier and magnifier, with screw on lid

Surveying & Mining Aneroid Barometer, Negretti & Zambra,English, c.1890, the dial marked 'Surveying and Mining Aneroid Compensated NEGRETTI & ZAMBRA LONDON 8911' with geared scale running 0-4000 ascent and 0-2000 decent, and second geared vernier scale with magnifier, in polished aluminium case 12cm diameterNote: responds well to the bag test

A George III mahogany cased stick barometer by Fraser of Bond Street, London - with a broken arch pediment above the bow fronted case with silvered dial incorporating vernier scale, thermometer and urn shaped bell, 100cm long, Note: William Fraser is recorded as born circa 1720 and died 1815. He worked as 'Optician and Mathematical Instrument maker to the King and The Prince Wales' from 3 New Bond Street, London, and took his son into partnership in 1799. Ivory reference number TBPHVQHA

Escort-based RS1600i superbly prepared by Lavant Garage for Group 1 and presented in iconic Royal Mail 'Datapost' livery. Followers of saloon car racing in the mid-1980s will certainly remember the distinctively presented 'Group A' Datapost RS1600i Escorts prepared by Richard Longman Racing for himself and Alan Curnow. Whether it was the fact that the staid old Post Office had decided to go racing, or the fact that the cars were very competitive, or simply that they were painted Post Office Red and looked great is not clear, but they are well remembered and have been the subject of diecast scale models from half a dozen different companies.The Datapost-liveried Escort on offer here is not one of those early Richard Longman cars but was built to a high standard in the early 2000s from a rust-free shell to RS1600i specification and raced successfully in CTCRC with numerous class wins. It subsequently spent ten years in a heated garage before our vendors instructed classic Ford Escort RS1600i specialists, Lavant Garage in Chichester, to recondition the car and fully prepare it to return to the circuits.All the safety equipment is up to date including a new fire extinguisher with 16 years of life and all correct nozzles and mountings. Most importantly, the list of components renewed or serviced on this RS is exhaustive (full details in the history file) The CVH engine features Accralite forged high-compression pistons, ARP big end bolts, Kent race cam (solid lifters), Vernier cam sprocket, Bosch K Jetronic PI, DTA management, an Ashley 4-1 tubular exhaust manifold, Mocal oil-cooler and Direnza alloy radiator, all of which contribute to a willing and respectable 145bhp. The Quaife 5-speed gearbox is straight-cut with a Motorsport LSD and ZF Sachs paddle-clutch. Much of the drive train and brakes (AP) are new as is most of the fuel system with a high pressure fuel pump, injectors and 25-litre foam-filled tank. All the bearings are new with ZX1 Super Grease and the car is fitted with a race wiring loom and the essential heated screen.This beautifully-presented 1980s 'homologation special' with its period correct livery could be a very cost effective way into some lovely championships, including the HRDC Gerry Marshall Trophy and CTCRC 'Group 1' and is a very rewarding car to drive, after all it has 'Group A' underpinnings. It's been prepared by the best and should represent cost effective and reliable racing for the coming seasons.Specification Make: FORD Model: RS 1600I Year: 1983 Chassis Number: TBA Registration Number: N/A Transmission: Manual Drive Side: Right-hand Drive Make: RHD Interior Colour: RaceClick here for more details and images

EARLY VICTORIAN MAHOGANY AND EBONISED STICK BAROMETER, BY HENRY FRODSHAM, LIVERPOOL MID 19TH CENTURY the bow-front case with silvered vernier scale from 27 to 31 inches and a thermometer, signed ‘H. Frodsham, Liverpool’, beneath a concave-moulded pediment, the base with ebonised urn-shaped cistern cover 100cm long For a comparable example, see Christies, London, Important Clocks & Scientific Instruments, 11 Jul 2003, Lot 125, sold for £5,375

A 19th Century Rosewood Stick Barometer and Thermometer, by Easton of Glasgow, with silvered vernier and scale, contained in case with arched top and turned cover to cistern, 36ins high

An early 19th century mahogany stick barometer, signed 'Desbois Grays Inn Passage London', the caddy top over a 17cm silvered register with vernier scale, signed with the makers name, above a thermometer and domed cistern, 95cm high

Inclinatorium with vernier scale. Indication of inclination. Device with vernier with which one can read the angle of deviation. (inclination), 23 cm high

Chesterman Vernier caliper 36 cm scale, measures to 1/50th mm. Not available for in-house P&P

A Mahogany Stick Barometer, signed Abraham, Optician, Bath, circa 1800, nicely figured mahogany case with turned cistern cover, concealed mercury case with a single vernier silvered dial signed, thermometer tube, ivory adjustment knob 94cm highWith Non-Transferable Standard Ivory Exemption Declaration Number 2SSU1NN3 Case with some small cracks and chips in parts, case edges with small dents in parts, top side of the case with a small portion of outer crossbanded moulding missing, dial is clean, vernier scale is moving correctly when turning the adjustment ivory knob, visible mercury in the tube, thermometer tube is complete.

A Victorian figured mahogany stick barometer, the ivorine dial with vernier scale and inscribed 'J. Amadio 6.Shorters Court City', the Gothic Revival case with castellated pediment and tracery frieze, mercury thermometer to trunk and square cistern cover, height 101cm.

A 20th century gilt lacquered brass laboratory stick barometer of cylindrical form, the glazed upper section enclosing a silvered vernier scale, detailed 'J.W Towers & Co Ltd Manchester', the trunk with mercury thermometer, mounted on a mahogany backplate, total height 112cm.

AN EARLY VICTORIAN MAHOGANY BOW-FRONT STICK BAROMETERBy Adie & Son, EdinburghWith a stepped rectangular pediment above the signed silvered dial with vernier scale, above a figured veneered bow front, above a rectangular block cistern cover100cm highIMPORTANT INFORMATIONThis lot contains ivory and has been registered in accordance with the Ivory Act (section 10).  Reference No. VQ9L8PC9Prospective buyers should be aware that some countries have limitations on importing items made from endangered species, including materials such as coral, ivory, and tortoiseshell.  Therefore, it is advisable for potential buyers to familiarize themselves with relevant customs regulations before placing bids, particularly if they intend to import this lot into another country.  CONDITION REPORTPlease note there is no mercury visible in the tube.  The case is in good order.  The bottom block appears a later replacement?

A BRASS AND WALNUT FORTIN LABATORY BAROMETERBy A. Gallenkamp & Co. Ltd., London, No. 6728, 20th CenturyWith a cylindrical shaft and glazed silvered scale with vernier, above a thermometer scale with reservoir below, on a rectangular stepped walnut back back113cm highCONDITION REPORTThe barometer appears in good order, but not tested.

An ebony octant by R Millar, Leith. Circa 1850, with a lacquered brass radius arm and vernier scale, cased, height 34cm.

Large Brass Theodolite By Stanley, London English, c.1890, engraved to the silvered compass dial 'Stanley Gt Turnstile Holborn London 8217' on 4 levelling feet, on 6" silvered scale with vernier magnifiers, with A frames supporting telescope with 6" scale, telescope with rack and pinion focus, in large fitted mahogany case

Large Reversible Surveyors Level By Morin, Paris, French, .1880, engraved ‘H. Morin, 11 Rue Dulong (Anct rue Boursault), Ateliers H Morin & Gensse a Paris’, level on 3 screw feet, engraved silver sale and vernier scale, long spirit level (empty), with reversible telescope with rack and pinion focusing and spirit level, 37cm long

Early 19th century mahogany cased mercury barometer, by C. Tagliabue & Casella. The mahogany cased barometer having a Vernier scale calibrated in barometric inches with weather observations beneath the signature C. Tagliabue & Casella 23 Hatton Gardens London, with bone knop adjusters, name plate with a thermometer below, approx 103 cms x 16 cms at its widest point.  4Q53U4VD

A Portuguese brass marine stick barometer, the silvered register calibrated in barometric inches with vernier scale inscribed 'J.J.B.L.M 16a22 R.N. Desterro Lisbon', with gimbal mount and bracket, 95cms high

EBONY AND BRASS NAVIGATIONAL OCTANT BY SPENCER, BROWNING AND CO., LONDON, c. 1840, The 11 inch frame incorporating central T-shaped hand-piece inset with bone signature plate inscribed beneath turned bone finial, the index arm mounted with mirror opposing Vernier aperture scale calibrated in minutes of arc for reading the inset curved scale divided for every twenty seconds of arc, the underside with pivot clamp and endless tangent screw adjustment, the sight vane with twin pin-holes and shutter opposing horizon glass and set of three hinged shades/filters, the tapered mahogany case with loose inner lid paper label for JOHN BLISS & CO., 110 Wall Street, New York, the box 33cms (l), and with loose swing tag inscribed 'From Capt. Ralph Stocking, c/o Dr E. M. Beckley....Conn.'Provenance: the Karl Johansen (1937-2021) Collection, by family descent

* Sextant. A ship's sextant by E. Lorieux, Paris, circa 1872, with brass ladder frame signed and dated 1872, with silvered scale divided to 160º, vernier with hinged magnifier on index arm stamped 'E. Lorieux constructeur A Paris', contained in a mahogany box with brass handles, with accessories including telescopes, shades etc QTY: (1)

A Victorian oak cased Admiral Fitzroy Royal Polytechnic barometer, the circular dial with vernier scale, and inscribed ‘Joseph David & Co., Sole Manufacturers Fitzroy Works, Kennington Park Rd. London’, above special remarks panel, and pair of mercury thermometers, 107.5cm high, 31cm wide.

Metal thermometer. Temperature measurement. Works on bi-metal and then expands and contracts. This is mechanically made visible on a vernier scale, 31 cm high

Proof of mirror law. Reflection of light rays. Müller's reflection apparatus. The apparatus is set to 0°. Light ray falls through the diaphragm slit. Then the mirror is turned and the reflected ray falls on the upright vernier scale, which indicates the angle of the mirror, 11 cm high

Total Reflection Apparatus. Apparatus for visualizing the refraction of light. Apparatus is filled with water and a few drops of fluorescent solution. At the center of the vernier (scale division) mirror and lenses allow the refraction of light and the lens laws to be explained, 52 cm high

A Collection of Various Vintage Empty Boxes,a Vernier Caliper, Scale Weights Etc

A George III mahogany stick barometer, by J. Search, Soho, London, c.1780, the silvered vernier scale in arched window, beneath three acorn finials, further signed to the lower scale, 103 cm.The tube seems intact and shows a consistent column of mercury that responds either up or down with the reservoir adjustment screw, the spirit of the thermometer is evident and looks as if it responds to a finger placed on the tube (but very faintly)Generally good order, and seems to be functioning, this is no guarantee of accuracy or reliability as with any antique scientific instrument..

A J King ebony octant, English, circa 1837, stamped J King Bristol,the ebony octant with ivory scale, vernier and maker's plaque, fore and back sights and one set of coloured filters, in stepped painted pine case with owners name carved on the lid ED RENOUF 1837, octant 28cm (11in) case 10 by 34 by 38cm (4 by 13 1/2 by 15in) Footnotes:Ivory license no. 5DS6WE7W Edward Renouf was a Jersey-born captain of the brig Patruus as portrayed in lot 29.This lot is subject to the following lot symbols: Y ФY Subject to CITES regulations when exporting items outside of the UK, see clause 13.Ф This lot contains or is made of ivory and cannot be imported into the USA or any country within the EU.For further information on this lot please visit Bonhams.com

A Langford ebony octant, English, circa 1830,signed Langford Quay Bristol, with ivory scale, vernier and maker's plaque, horizon glass and two sets of coloured filter,. in shaped mahogany case with two oculars, octant 23cm (9in) radius, case 12 by 30.5 by 33cm (4 3/4 by 12 by 13in) Footnotes:Ivory license no. FTC54FEThis lot is subject to the following lot symbols: Y ФY Subject to CITES regulations when exporting items outside of the UK, see clause 13.Ф This lot contains or is made of ivory and cannot be imported into the USA or any country within the EU.For further information on this lot please visit Bonhams.com

A. E. Abraham, Exeter, an oak stick barometer the arched silvered dial engraved with barometric scale and vernier and signed A.E. Abraham, Optician, Exeter, the arched-top oak case having a visible tube, turned cistern cover and glazed door, height 98cm.A.E. Abraham is recorded as working in Exeter in the early 1800s.

TWO ANTIQUE BAROMETERS including, 19TH C. OAK STICK BAROMETER, Baily, Birmingham, celluloid vernier scale, mercury thermometer, later brass window glass frame, 96cms (h), restorations, FRENCH BRASS SHIP'S BAROMETER, J. Salleron, Paris, no. 67, on gimble mount, steel vernier scale, engraved 'Depot de la Marine', mercury thermometer, 89cms (h), restorations (2)Comments: deceased estate PenarthComments: restorations to both, inspection advised

An Early First Form, Wollaston Pattern Crystallographic Goniometer, Thomas Jones, English, c.1810, engraved to the front 'Thomas Jones, 62 Charring Cross' the goniometer on a turned French polished wooden base with supporting 'A' frame terminating in a split bearing, with 2 knurled wheels at the rear, 1 to turn the spindal holding the armature the other to turn the spindal and the scale, with a silvered vernier scale at the side reading to arc-minutes, this is the first form of Wollaston goniometer with the the sprung stop at the 0 and 180 positions which was a feature dispensed with on later devices, in the original Mahogany case with catches, case height 15cm, with period glass dome cover Jones, Thomas, according to Clifton Jones was working at 62 Charing cross from 1816, was apprentice to Jesse Ramsden History and Operation of the Wollaston Crystallographic Goniometer The Wollaston crystallographic goniometer was a significant development in the field of crystallography, enabling scientists to measure the angles between crystal faces with great precision. The invention of this device is attributed to William Hyde Wollaston, a British scientist and polymath, in the early 19th century. His work not only advanced the study of crystallography but also laid the foundation for future innovations in mineralogy and materials science. Before the development of the goniometer, scientists faced challenges in accurately measuring the geometry of crystals. Crystals, with their symmetrical and structured shapes, had long intrigued scientists and mathematicians alike. However, understanding their internal symmetry required precise measurements, particularly of the angles between their faces. Traditional tools used for such measurements, were inadequate for obtaining the level of accuracy needed for detailed scientific study. In 1809, Wollaston introduced his crystallographic goniometer. This instrument allowed for highly precise angular measurements of crystal faces, down to fractions of a degree. Considered the first reflecting goniometer, a type of instrument that relies on measuring the reflection of light to determine the angle between crystal faces, as opposed to contact goniometers, which require physical interaction with the crystal. Wollaston’s invention significantly impacted mineralogy and crystallography because it allowed for the accurate measurement of the fundamental angles of crystals, leading to better classification and understanding of crystal structures. By measuring the angles between different faces, researchers could deduce the symmetry and internal structure of the crystal. This was particularly useful for the study of minerals, as crystals often form naturally in these materials. Operation of the Wollaston Goniometer The Wollaston goniometer is classified as a reflecting goniometer, where the measurement of angles is based on the reflection of light. The basic principle involves aligning the reflection of a light source on one face of the crystal, followed by measuring the angle at which the light reflects from another face. The operation of the Wollaston goniometer can be broken down into a few key steps: 1: Mounting the Crystal: The crystal specimen is carefully mounted on a spindle that can rotate using a small piece of wax. The crystal is positioned so that one of its faces can reflect light. Precise mounting is critical, as the measurement accuracy depends on the crystal's stability and the reflected light's clarity. Aligning the Light Source: A light source is directed at the mounted crystal. In Wollaston’s design, this was often natural light or a simple lamp. The goal is to ensure that the light strikes one of the crystal's faces at a specific angle and reflects back toward an observer. Measuring the Reflected Angle: The observer views the reflection of the light from one face of the crystal. The goniometer is equipped with a graduated circle that can rotate along with the crystal. Once the reflection is observed, the goniometer is rotated until the light reflects from another face of the crystal. The angle of rotation is measured using the graduated circle. This angle corresponds to the interfacial angle between the two crystal faces. Repeating for Different Faces: The process is repeated for different pairs of faces to fully characterize the crystal. By systematically measuring the angles between different faces, it is possible to derive the symmetry and geometry of the crystal. The precision of the Wollaston goniometer allowed for measurements to within 30 seconds of arc, which was a major improvement over previous instruments. The reflecting goniometer, unlike contact goniometers, did not require any physical contact with the crystal, which could damage fragile specimens. Furthermore, by using the reflection of light, it was possible to obtain much more accurate measurements, as light reflection is a highly precise phenomenon that can be accurately measured. Impact on Crystallography - The Wollaston goniometer became an essential tool in crystallography, enabling researchers to explore the geometrical properties of crystals with a great level of detail. Its use led to the discovery of several important principles in crystallography, including the identification of crystal symmetries and the formulation of laws such as the law of constant interfacial angles, which states that the angles between equivalent faces of crystals of the same substance are constant. Wollaston’s contribution also paved the way for the development of more advanced goniometers and crystallographic tools. Later innovations included more precise optical systems and automated goniometers, which could be used to measure crystals with even greater accuracy and efficiency. In modern crystallography, the basic principles of angle measurement established by the Wollaston goniometer remain relevant, even as X-ray diffraction and other techniques have expanded the toolkit available to researchers. References: 1: P. Gay, *Wollaston and His Reflecting Goniometer: A Historical Review*, Nature, 1966. 2: C. Giacovazzo, *Fundamentals of Crystallography*, Oxford University Press, 2011. 3: G. L. Clark, *Applied X-ray Crystallography*, McGraw-Hill, 1955. 4: B. E. Warren, *X-ray Diffraction*, Dover Publications, 1990.

Astronomical Transit Instrument, Schmalcalder, London, English, c. 1840, signed in script along the vernier arm ‘Schmalcalder 82 Strand, London’, standing on a delicate brass frame with fine height adjustment via geared wheel, tall uprights with lamp mounts (lamp missing) to both sides, telescope with a 6inch scale with 2 vernier scales, clamp with fine screw adjustment, spirit level, telescope with 90degree eyepiece with cross hairs in place, rack and pinion focus, achromatic cell to front behind lens cap, telescope length 60cm, with original spirit level with engraved scales to read the bubble position, height 48cm, width 34cm, circle 14cm, telescope focuses, lenses dusty, image inverted

A GEORGE III MAHOGANY STICK BAROMETERBY DOLLOND, LONDON, LATE 18TH CENTURY / EARLY 19TH CENTURYinlaid with ebony edging, the swan neck pediment with bone rondels, above a silvered dial, with vernier scale, inscribed 'Dollond London', enclosed by a glazed door with brass frame, with a conforming thermometer compartment103cm highProvenanceThe contents of The Grange, Wendover.

Sextant no makers mark, 7" diameter, with Vernier scale, black lacquered frame and Certificate of Examination dated January 1918, cased

A George III mahogany stick barometer by William Horrod of London - the broken architectural pediment over a signed, silvered register with sliding vernier scale and mercury thermometer, the trunk with feathered veneers, moulded angles and exposed tube, terminating in a domed, bulb-shaped cistern cover, 96.5 cm high, moulding missing from one side of pediment.

AN AUSTRIAN OXIDISED BRASS THEODOLITENEUHOFER AND SOHN, VIENNA, EARLY 20th CENTURYThe telescope with rack and pinion focus adjustment and fitted with a spirit level to top, mounted via a horizontal pivot terminating with a spoked vertical circle incorporating fine silver Vernier scale to circumference with pivoted scale magnification glass to one end opposing fine screw angle adjustment bar to the other, onto a pierced U-shaped frame and rotating table incorporating X and Y orientated spirit levels, Vernier sector with pivoted magnifier, and rotation locking clamp with fine thread adjustment and signed NEUHOFER & SOHN, VIENNA beneath serial number 7135 to the arm, the fixed base with silvered ring calibrated in degrees of rotation divided for half degree increments to the circumference, the whole raised on squat column upright issuing triform radial supports with screw feet, in original wooden box with some accessories and pasted factory calibration label to the inside of the door.The instrument 20.25cm (8ins) high, the tube 16.5cm (6.5ins) long with focus closed; the box 30cm (11.75ins) high, 20.25cm (8ins) wide, 22cm (8.75ins) deep. The firm of Neuhofer and Sohn was established when Carl Neuhofer joined his father, Joseph, as a partner in the business previously known as 'Optisches Institut Carl Cross and Comp.' trading from 8 Kohlmarket, Vienna. The business became particularly well known for their optical and surveying instruments and continued trading up until around 1940. 

A FINE VIENNESE LACQUERED BRASS CAMPAIGN THEODOLITE CHR. AND G. STARKE, VIENNA, MID 19th CENTURYThe single short draw focusing telescope inscribed K. K. polytechn. Institut in Wien. Chr. & G. Starke to one side held within oxidised brass frame supporting a spirit level to top and with micrometer screw elevation adjustment to eyepiece end, fitted via a rotating joint onto a horizontal degree circle with fine silver scale and Vernier applied to an arm screwed to the telescope frame, the base with ball and socket sleeve joint for mounting on a tripod, in unusual tooled and textured paper covered 'admiral's hat' shaped carrying case finished to resemble leather and with moulded fabric lined interior incorporating a small selection of accessories; with a wooden tripod, 19th century, incorporating oxidised brass knuckles and threaded instrument mounting socket, (2).The case 12cm (4.75ins) high, case 18.5cm (7.25ins) wide; 11.5cm (4.5ins) deep; the tripod 84cm (33ins) long closed. The current lot was presumably made by Georg Christoph Starke (1794-1865) in partnership with his son, Gustave (1832-1917) suggesting that it was made in around 1850. 

A VICTORIAN SCOTTISH OXIDISED BRASS SEXTANTROBERT YOUNG AND SON, GLASGOW, SECOND HALF OF THE 19th CENTURYThe pierced 7 inch frame with pivoted arm mounted with mirror opposing hinged magnification lens over aperture for reading the fine silver inset brass Vernier scale signed Robert Young & Son, Glasgow, with two sets of hinged filters, brass telescopic sighting tube and wooden grip to rear of frame, the fitted mahogany box with two additional eyepiece sections for the sighting tube and a solar filter.The box 12.5cm (5ins) high, 28cm (11ins) wide, 25cm (9.75ins) deep. Provenance:The personal collection of the former owners of Marine Instruments Limited, Falmouth, Cornwall.

AN EARLY VICTORIAN LACQUERED BRASS THEODOLITETROUGHTON AND SIMMS, LONDON, CIRCA 1840The telescope with rack and pinion focus adjustment and fitted with spirit level to top, mounted within a frame positioned between two A-frame uprights incorporating a half circle adjusted for inclination via a rack and pinion and inset with silvered scale reading against a Vernier fixed at the base of one of the uprights, set on a circular brass revolving table applied with a glazed compass divided for degrees and labelled with eight cardinal points to centre as well as X and Y orientated spirit levels, the table signed Troughton & Simms, LONDON over a silvered Vernier sector with another to the opposing side for reading against the fixed canted silver ring to the circumference of the base calibrated for degrees of rotation divided for half degree increments, fitted with clamp and fine screw rotation adjustment over a column upright with elaborate triple-screw adjustable mount with threaded socket to underside, in original mahogany box with an additional eyepiece tube and a brass plumb weight.The instrument 22.5cm (8.75ins) high minimum, the tube 26cm (10.25ins) long with focus closed; the box 15cm (6ins) high, 29cm (11.5ins) wide, 22.5cm (8.75ins) deep. The partnership between Edward Troughton and William Simms is recorded in Clifton, Gloria Directory of British Scientific Instrument Makers 1550-1851 as formed in 1826 and operating primarily from addresses in Fleet Street, London. Edward died in 1835 followed by William in 1860; the business was subsequently continued by their successors until 1922 when the name was changed to Cooke, Troughton and Simms. 

Y&nbspA FRENCH WALNUT-CASED PART SET OF NAVAL ARCHITECT OR CARTOGRAPHERS DRAWING INSTRUMENTSE. LORIEUX, PARIS, MID 19th CENTURYComprising a heavy 16.5 inch hinged brass sector engraved with two opposing angled scales each marked for single units annotated in tens 10-600, the left upper margin inscribed (Les parties egales) and signed E. Lorieux, A Paris, No. 5 and the lower inscribed Depot des cartes et plans de la marine, the right-hand side engraved with initials E.F. over N. 5 and P.B., contained in a hinged polished mahogany case; a brass and steel draughtsman's protractor with radius divided for degrees and annotated in tens in both directions, with hinged arm pivoted at the centre incorporating Vernier scale and also engraved Depot des Cartes et Plans, de la Marine (10), E. Lorieux, A Paris and initialled P.B, E.F., both the arm and the base of the arc fitted with steel extension rules; two compass radius arms, the first with 42 inch boxwood beam fitted with steel sharp point set in a T-shaped mount engraved Depot de la Marine, 22 and P.B. over E.F. to verso, opposing a conforming sliding mount fitted with a loop for a pencil and engraved E. Lorieux a Paris, the second of similar design but smaller with 23.75 inch steel beam and signed ...Hurlimann a Paris over initials E.F. to mount; four ebony square-section straight edges; three various boxwood rulers; two steel rulers; and a boxwood set square, all contained in a solid walnut box inset with brass plate engraved E. Fichol to lid and with substantial hinged cast brass carrying handles to each end.The box 120cm (47.25ins) long including handles, 13cm (5ins) high, 26cm (10.25ins) deep. The firm Lorieux was one of the most important Parisien manufacturers of sextants and other maritime instruments during the second half of the 19th century. The business was established in 1845 by two pupils of the renowned instrument maker Henri Gambey; in around 1902 the firm moved from 43, Passage Dauphine, Paris, to 6 rue Victor Considerant. It was then taken over by Albert Lepetit, in about 1914, and moved to Montrouge at 204 avenue Marx Dormoy, before passing into the hands of Roger Poulin in around 1950. 

Y&nbspA REGENCY MAHOGANY MERCURY STICK BAROMETERTHOMAS BLUNT, LONDON, EARLY 19th CENTURYThe caddy moulded case with swan neck pediment over rectangular glazed silvered Vernier scale calibrated in barometric inches and signed T. Blunt, 22 Cornhill, LON, DON to upper margin, the ebony-edged trunk with Vernier adjustment square to throat and flame-figured veneers, over ogee-moulded domed cistern cover to the rounded base incorporating level adjustment square to underside.98.5cm (38.75ins) high, 12.5cm (5ins) wide. Provenance:The Leonard Fuller Collection. Thomas Blunt is recorded in Goodison, Nicholas ENGLISH BAROMETERS 1680-1860 as apprenticed to the celebrated scientific Instrument maker Edward Nairne in 1760, with whom he subsequently formed a partnership after gaining his freedom of the Spectaclemakers' Company in 1771. Edward Nairne died in 1806 although some instruments signed for 'Nairne and Blunt' are believed to have been made after that time. Thomas Blunt was a distinguished instrument maker who was credited with assisting J.H. Magellan with some of the features of his 'New Barometer' devised in 1779. Blunt is believed to have continued alone from his Cornhill address until his death in 1822; he was succeeded by T. Harris. 

A VICTORIAN MAHOGANY MERCURY STICK BAROMETERJACKSON, DERBY, THIRD QUARTER OF THE 19th CENTURYThe arch top case with hinged cushion-moulded glazed door for the brass Vernier scale calibrated in Barometric Inches and with the usual observations to the right-hand side opposing a Fahrenheit scale spirit tube thermometer to the left, the upper margin signed Jackson, Derby, above slender trunk with visible tube over domed cistern cover to the rounded base.90cm (35.5ins) high, 11cm (4.375ins) wide. 

A PORTUGESE OXIDISED BRASS SEXTANTJ.J. RIBEIRO, LISBON, SECOND HALF OF THE 19th CENTURYThe pierced 7 inch triple-circle frame with pivoted arm mounted with mirror opposing hinged magnification lens over aperture for reading the fine silver inset brass Vernier scale signed J.J. Ribeiro Lisboa, with two sets of hinged filters, brass telescopic sighting tube and wooden grip to rear of frame, the fitted mahogany box with two additional eyepiece sections for the sighting tube.The box 12.5cm (5ins) high, 25.5cm (10ins) wide, 23cm (9ins) deep. Provenance:The personal collection of the former owners of Marine Instruments Limited, Falmouth, Cornwall.

A mid 19th century mahogany cased stick barometer by Melling of Liverpool, the 18cm signed silvered register with double ivory vernier scale, above the mahogany case and enclosed mercury tube, extending to the domed cistern, 91cm highPlease note this lot is offered for sale in accordance with the Ivory Act 2018, Trevanion Auctioneers & Valuers LLP have applied for an exemption licence for the ivory in this lot Ref: 5V8X82D4

A George III style mahogany stick barometer - by Comilli of Holborn, with a silvered register incorporating a vernier scale, the base with a turned cistern.

A BRASS MARINE STICK BAROMETER, modern, the glazed tube with silvered vernier scale stamped XO35 and signed F Dalton & Co. Watford, with thermometer, 43" high, mounted in a glazed mahogany square case with hinged door, 8 1/4" x 48 3/4" (Est. plus 24% premium inc. VAT)Condition Report: Appears to be in very good condition.

A George III mahogany stick barometer, the silvered rectangular dial with vernier scale and inscribed 'H. Foy Fecit', the case with broken arch pediment, the door and trunk with chequer band inlay, the visible mercury tube above a turned cistern cover, height 96.5cm (lacking thermometer and faults).

An early 19th century mahogany stick barometer, the silvered rectangular dial with alcohol thermometer and vernier scale, inscribed 'Watkins 16 St. Augustins Back Bristol', the case with domed surmount above a glazed door, visible mercury tube and turned cistern cover, height 96.5cm. Note: William Watkins is a recorded barometer maker working at 16 St Augustins Back (now St. Augustines Parade) from 1825 to 1830.