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An early 20th century rosewood stick barometer, with a silvered scale with adjustable vernier, above a thermometer, the case with moulded decoration and turned cistern cover, 100cms high

A late 19th century 9 inch radius vernier sextant, maker J. Coombes, Devonport, serial number '6151' , the lacquered three circle frame with brass arc inset silvered scale calibrated to 110° and signed as per title, fitted magnifier, mirrors and shades, together with sighting scopes and accessories in a mahogany case.

A collection of early 20th century surveyor's scale rulers - together with a vernier calliper.

Portuguese brass marine stick barometer, the silvered register calibrated in barometric inches with Vernier scale and inscribed 'J.J.B.L.M 16a22 R.N. Desterro Lisbon', with gimbal mount and bracket, 97cm high overall

λ A ROSEWOOD STICK BAROMETERBY THOMAS HARRIS, LONDON, C.1820-40with an ivory thermometer and vernier scale inscribed 'Thos Harris Opticians to the Royal Family, Opposite the British Museum, LONDON', with a bone adjuster and turned reservoir cover91.8cm high*This item is offered for sale in accordance with the Ivory Act 2018 and has been assigned an exemption certificate.

A 19th century lacquered brass pocket sextant of cylindrical drum form, having a silvered vernier scale and adjustable arm with magnifying lens, engraved Brush & MacDonnell Sydney, dia. 3", in brown stitched leather case later marked William H. Coombs Hodgley River Survey 1910.

Unusual early 19th century stick barometer, Charles Aiano London, the engraved signed rectangular brass scale reading from 28 to 31 inches of pressure with vernier and Remarks, the ethanol thermometer with Centigrade scale and Remarks, flanking partially exposed main tube, on oval backing, the hinged oval cover with verre églomisé surround and crossbanded border, the trunk with wooden cover to main tube between crossbanding, to a turned cistern cover, 96.5cm highLiterature: See Banfield, Edwin: "Barometer Makers and Retailers 1660-1900", where Charles Aiano is recorded as working in London circa 1790-1820; he is believed to have moved to Canterbury around 1825.

An Exceptionally Fine Powell & Lealand "No. 1" Compound Monocular/Binocular Microscope English, dated 1898, signed in script to the top of the bar-limb ‘POWELL & LEALAND, 170 Euston Road, London’, of standard No.1 construction standing on a massive lacquered tripod base with rectangular feet each with cork pads, trunnions to the top supporting the body, with large plano-concave mirror to the base as typically supported on one side at the end of an articulated arm sliding on a collar, above which is the fully mechanical stage with X & Y control via screw and rotation controlled through a crown and gear, with focusing via rack and pinion to the rear, with platinum circular scale and vernier, rotation controlled via a crown and gear mechanism that can be disengaged for quick movement, with large Turrel-type mechanical stage with X-Y control, main course focus to rear of body, bar-limb incorporating fine focus lever mechanism, nose piece with prism blanking plate, limb with threaded boss to accept binocular or monocular tubes, the microscope comes with the following accessories in a mahogany case: Pair of Binocular eyepieces

A late George III mahogany stick barometer, the silvered dial with vernier scale and signed 'Storr York', the case with arched top above visible mercury tube, fluted cistern cover and pierced terminal, length 103cm.

A late Victorian walnut stick barometer, the arched ivorine dial with Vernier scale and inscribed 'A & N. C. S. L.', the arched case with bevelled glass panel above a mercury thermometer to trunk and turned circular cistern cover, length 95cm.

Bergbau-Diopter-Bussolen-Theodolit von "Wilton & Co", um 1840Signiert: "Wilton & Co, St. Day, Cornwall", zaponiertes Messing, versilberter Kompaß, Ø 13 cm, Skala mit Nonius-Ablesung, 2 Diopter, 4 Stablibellen, 2 davon trocken, Gesamthöhe 25 cm, mit Deckel. Start Price: EUR 350 Zustand: (3/3)Early Wilton & Co Brass Miner's Dial and Theodolite, c. 1840Signed "Wilton & Co, St. Day, Cornwall", lacquered brass, silvered compass scale with vernier, Ø 5 in., two sights, four spirit levels, two dry, overall height 10 in., with lid. Start Price: EUR 350 Condition: (3/3)

Unusual Elliot Aneroid Barometer, English, c.1880, silvered face engraved 'Elliot Bros, Charing Cross, London' face with moveable vernier scale to read barometric pressure, with curved thermometer, in original leather covered case Note

A Watson Petrological Edinburgh Microscope, English, c.1910, engraved to the back of the tripod stand 'WATSON & SONS Ltd, Depot 2 Easy Row Birmingham' and to the side of the foot 'GEOL. BIRM. UNIV. II' for Geology Birmingham University, also engraved 'G.D.B.U.II' to the objective, and polariser, the microscope on typical Edinburgh tripod stand, brass trunnions support the body with the plano-concave mirror in gimbal on a sliding collar, polariser with Nicol prism, engraved scale with pointer, with clip-on condenser lens on focusing substage collar, goniometer stage with engraved scale around circumference with vernier to rear, body tube with slide in/out polariser, slide in /out Bertrand lens on internal collar, eyepiece with cross hairs, height 41cm

Swing Arm Protractor, English, c.1840, engraved across the vernier arm'Watkins & Hill Charring Crofs London' with silver scale, gearing around the edge both arms with steel springs, in a shaped French polished mahogany case

An Exceptionally Fine Powell & Lealand "No. 1" Compound Monocular/Binocular Microscope English, dated 1898, signed in script to the top of the bar-limb ‘POWELL & LEALAND, 170 Euston Road, London’, of standard No.1 construction standing on a massive lacquered tripod base with rectangular feet each with cork pads, trunnions to the top supporting the body, with large plano-concave mirror to the base as typically supported on one side at the end of an articulated arm sliding on a collar, above which is the fully mechanical stage with X & Y control via screw and rotation controlled through a crown and gear, with focusing via rack and pinion to the rear, with platinum circular scale and vernier, rotation controlled via a crown and gear mechanism that can be disengaged for quick movement, with large Turrel-type mechanical stage with X-Y control, main course focus to rear of body, bar-limb incorporating fine focus lever mechanism, nose piece with prism blanking plate, limb with threaded boss to accept binocular or monocular tubes, the microscope comes with the following accessories in a mahogany case: Pair of Binocular eyepieces

A Fuess Petrological Microscope, German, c.1910, engraved to the rear of the foot ‘R. FUESS, STEGLITZ-BERLIN 1365’, microscope standing on a lacquered ‘Y’ shaped base, lead filled for stability, tall upright supports the body on small trunnions, plano-concave mirror in gimbal on sliding collar, focusing substage collar with substage analyser, with Nicol prism, condenser lens, and iris, nickel plated circular stage engraved around circumference with 2 vernier scales , with swing in/out condenser, centering marks and slide clips, screw fine focus with engraved scale and vernier scale, course focus acting on diagonal rackwork, body with quick change objective holder, centering nosepiece, slide in/out analyser, slide in/out Bertrand lens on focusing collar, goniometer eyepiece with engraved scale and internal Nicol prism, complete with a micrometer eyepiece, marked ‘M’ another eyepiece marked 3, a box of accessories including 3 objectives marked 0, 4 & 7 and a few associated plates, all in the original wooden case, Note: for a similar instruments see ‘The Petrographic Microscope: Evolution of a Mineralogical Research Instrument, by Dan Kile’ p.25 fig. 22 for a very similar instrument.

A Cary Presentation Brass Box Sextant, English, circa 1860,signed Cary, London, Brass body with sliding shutter sight and dark lens, wheeled rack drive to index arm reading from 0 to 150 degrees on the silvered scale, with magnifying lens to vernier, with separate telescope, the lid engraved Royal Military College. Presented to Gentleman Cadet William S. Cooke for Attention to and Progress in Military Surveying, June, 1860, in baize lined mahogany case with maker's label reading Cary Optician 181 Strand, London and instruction pamphlet, sextant 3in (7 1/2cm) diametercase 4 3/4in x 2 1/2in x 4in (12cm x 5cm x 10cm) Footnotes:Provenance:According to the 3rd July 1860 edition of The London Gazette, Gentleman Cadet William Smith Cooke from the Royal Military College was appointed to the 2nd Regiment of Life Guards in the Summer of that year. This Cary box sextant would likely have been a presentation gift to commemorate this occasion.For further information on this lot please visit Bonhams.com

A large Thomas Blunt brass universal equinoctial ring dial, English, circa 1770,signed T Blunt London, made for use in both hemispheres, hours dived to 2 minutes, latitudes from N - 90 - 0 - 90 - S, bridge divided to one day intervals and Zodiac signs to one degree intervals, the reverse of the dial with a quadrant 0-90 and 90-0 degrees divided to 1/2 degree intervals, large suspension ring and mount sliding over latitude scale with vernier, 12in x 10in x 2/5in (30 1/5cm x 25cm x 1cm) Footnotes:Provenance:Hansord, Lincoln, 2014.Private collection.For further information on this lot please visit Bonhams.com

A large Thomas Wright double sided gunner's quadrant, English, circa 1730,signed Made by Tho Wright, Instrument Maker to his MAJESTY, the brass quadrant with index arm moving over 0-90 degree scale with Vernier, mounted with bubble level below plate with engraved signature, with obsolete broad arrow ordinance marks, 10in x 15in x 1in (25 1/2cm x 38cm x 2 1/2cm) Footnotes:Thomas Wright was apprenticed to John Rowley in 1707 and freed in 1715. From 1718 to 1748 he had a workshop at the 'Orrery & Globe', Fleet Street, London and he was granted a royal appointment to the Prince of Wales and George II in 1727.For further information on this lot please visit Bonhams.com

5IN. RADIUS VERNIER SEXTANT BY TROUGHTON LONDON, CIRCA 1800with single cast lacquered brass 'TY' frame, signed on the crossbar Troughton London, the arch with inset silver scale divided to 160º, Vernier with clamp and magnifier sighting tube, mirrors, 5 shades and threaded fruitwood handle, contained in fitted box of issue with accessories including two sighting tubes and a sun filter -- 9in. (23cm.) diameter missing one foot, swivel arm repaired, otherwise good overall condition.

7½IN. RADIUS BRIDGE-FRAMED VERNIER SEXTANT BY JESSE RAMSDEN, LONDON, NO. 1227, CIRCA 1794with lacquered-brass frame signed at the apex Ramsden London and numbered '1227' behind, the inset silvered scale divided to 130°, Vernier with lateral adjusting magnifier and rotating light prism, bridge-frame supporting adjustable sighting tube socket, mirrors and six shades, now mounted on pillar stand within glazed wooden box and presentation plate along top, with telescope's test certificates for 1902 and 1922, a privately written manuscript on vellum of the history of Jesse Ramsden along with a history of this instrument before presentation in 1921, both in full calf gilt embossed bindings -- 20 x 13½ x 14in. (51 x 34.5 x 35.5cm.)The Honourable Company of Master Mariners.original owner informs us in his history of the instrument that he had one mirror replaced, added the rotating glass prism and had the scale redivided by a London instrument maker, which he admitted was not quite as accurate as Ramsden's, when he mounted the instrument in this display case the original threaded wooden handle and stepped keystone case were disgarded, the certificates are foxed and have some losses

A fine Regency mahogany cased stick barometer, by Charles Porta, London, circa 1810, with a silvered face, engraved scale from ‘Stormy’ to ‘Very Dry’, with sliding vernier scale, a thermometer offset to the side, and signed ‘Chas Porta, London’, in a case with ‘break arch’ pediment, the body with chequered inlays, over a turned reservoir cover. 98cm high (Care: Contains Mercury. Leave upright at all times)

J Hicks - Hatton Garden London, - late 19th century carved oak cased Fitzroy barometer in a richly carved case with a carved crested pediment and square cistern cover, inverted opaline register reflecting FitzRoy's predictions and a scale from 27 to 31 inches of barometric pressure, with a thick bore cistern tube and adjustable rack and pinion twin vernier, fitted with a glazed snail bulb mercury thermometer recording the air temperature in both Fahrenheit and Celsius. Mercury clean and present.James Joseph Hicks was born in Ireland, however, early in his life he moved to London where he was apprenticed to the instrument maker Louis P Casella. In 1860 he went into business in his own right as a scientific instrument maker at 8 Hatton Gardens. In 1864 he was granted membership to the British Meteorological Society and exhibited instruments at the Royal Society Exhibitions between 1876 and 1913. Hicks was one of London's most prolific and eminent barometer makers. Dimensions: Height: 110cm Condition Report: The two vernier adjustment buttons are missing.

A Victorian oak Admiral Fitzroy's storm barometer by Negretti & Zambra, instrument makers to Her Majesty, circa 1870, having arched bevel glazed double ceramic vernier scales flanking the large bore mercury tube, each calibrated in barometric inches and with the usual observations, No. 1493, the trunk with vernier setting squares and applied glass mercury tube with Fahrenheit scale thermometer, further signed Negretti & Zambra London, h.102cmAll mercury intact and working.Left setting square is not moving, and the right side is lacking knob.Case with some age/handling wear, but otherwise good.Upper right scale with two cracks.Otherwise no apparent faults.

A bow fronted Mahogany cased Mercurial Stick Barometer having a swan-neck pediment, a turned brass finial and ebonised stringing and an urn feature to the base, 39'' long overall. The silvered imperial calibrated scale having a vernier reader operated by a turn-key (which is present).

A 19th century mahogany stick barometer and thermometer by Watkins & Hill Charing Cross, London, with silvered scale, height 97cm Wood finish fair to good, not treacly; urn-shape cistern cover held on with blue tack; white vernier adjustment knob not meshing with vernier; silvered dials generally good; glasses good; mercury-filled thermometer tube; working order unknown.

A SCOTTISH GEORGE III CHEVRON-EDGED MAHOGANY MERCURY STICK BAROMETER IN THE STYLE OF BALTHAZAR KNIECOUTTS, KINROSS, CIRCA 1800The onion-top chevron-edged case applied with arched silvered Vernier scale calibrated in barometric inches and with the usual observations beneath flowering urn motifs to upper margins and signed Coutts, Kinross to the lower, the trunk with visible tube and the base with oval lozenge-shaped cistern cover.100cm (39.5ins) high 10cm (4ins) wide. A Coutts of Kinross does not appear to be recorded in the usual sources however a James Coutts is recorded in Smith, John Old Scottish Clockmakers, FROM 1453 to 1850 as working in Perth 1800-48 including an address in Barosa Street from 1837 onwards. The design of the present lot is very much in the style of the renowned Edinburgh barometer maker, Balthazar Knie. An example of Knie's work of related design can be found in Goodison, Nicholas ENGLISH BAROMETERS on page 175 (plates 112 and 113). Condition Report: Tube is filled with no apparent airlocks hence is in working condition. The register plate has a solder repair and some distortion at apex above the tip of the tube otherwise is in good original condition with delicate detail within the engraving still clear. The silvering has streaky oxidation/tarnishing. The case has old glaze-type polish finish, some localised small replacements to the edging (none missing) and minor veneer shrinkage only. Condition Report Disclaimer

Y&nbspA GEORGE IV MAHOGANY MERCURY STICK BAROMETERW. HARRIS AND COMPANY, LONDON AND HAMBURG, CIRCA 1815With swan neck pediment over silvered Vernier scale calibrated in barometric inches and with the usual observations beneath signature W'm Harris & Co., 50 Holb'n London, & at, Hamburg to upper margin of the right-hand side of the tube, opposing mercury Fahren't and Reau'r scale thermometer to the left, set behind hinged brass framed glazed door over caddy moulded ebony line edged flame-figured trunk with Vernier setting square to throat, the rounded base applied with moulded domed cistern cover over level adjustment key to underside.97cm (38.25ins) high, 14cm (5.5ins) wide. The firm of William Harris and Company is recorded on the Science Museum Group website as trading from Bey dem Rathhause no.26, Hamburg, Germany in 1820; 50 Holborn, London 1816-39; 35 Crown St., Liverpool 1816-39, and 50 High Holborn, London 1816-35. The business was renamed William Harris and Son in 1840. Condition Report: Instrument is in fine working condition with no airlocks to the tube and only slight mellowing/oxidation to the silvering. The case is undamaged and free from visible restoration or replacements.Basically a nice example essentially in 'take home' condition. There is no key present for the bezel lock (can be opened and closed without).Condition Report Disclaimer

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. 

A FINE WILLIAM IV/EARLY VICTORIAN MAHOGANY BOWFRONTED MERCURY STICK BAROMETERFRANKHAM, LONDON, CIRCA 1830-40With concave-sided upstand and cavetto cornice over rectangular bow-glazed silvered Vernier scale calibrated in barometric inches and with slider to the right-hand side opposing the usual observations to the left, the upper margin engraved FRANKHAM, 12 Wilson St't, Grays Inn R'd, London, the flame figured mahogany trunk of the same bowed profile incorporating bone Vernier setting key beneath the cavetto throat moulding over applied glazed mercury tube Fahrenheit scale thermometer with ogee moulded crests to the upper and lower rails, the base with turned ebonised half vase cistern cover flanked by canted angles over cavetto moulded underside incorporating level adjustment square.97cm (38.25ins) high, 11cm (4.25ins) wide.  Richard and Henry Frankham are recorded in Banfield, Edwin BAROMETER MAKERS AND RETAILERS 1660-1900 as engravers working from 12 Wilson Street, Grays Inn Road, London, 1829-55. 

A GEORGE III MAHOGANY MERCURY STICK BAROMETERFRASER, LONDON, CIRCA 1770With open triangular pediment and cavetto cornice projecting at the sides over silvered Vernier scale calibrated in barometric inches and with the usual observations beneath engraved signature Fraser, London to the right hand side of the tube opposing Fahrenheit scale thermometer incorporating brass protective cover to the bulb to the left, over caddy moulded trunk with visible tube, the base with inverted baluster-vase shaped cistern cover.98cm (38.5ins) high, 16.5cm (6.5ins) wide. William Fraser is recorded in Banfield, Edwin BAROMETER MAKERS & RETAILERS 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. 

Y&nbspA REGENCY MAHOGANY MERCURY STICK BAROMETERBERRINGER, LONDON, CIRCA 1815With swan neck pediment over glazed silvered Vernier scale calibrated in barometric inches and with the usual observations beneath signature Berringer, London to upper margin, over caddy moulded ebony line edged trunk with Vernier setting square flanked by ogee side corbels to throat and arch glazed Fahrenheit alcohol thermometer to front, the rounded base applied with ring-turned domed cistern cover over level adjustment square to underside.98.5cm (38.75ins) high, 14cm (5.5ins) wide. Henry Berringer is recorded in Banfield, Edwin BAROMETER MAKERS & RETAILERS as working in London circa 1810-30.Please note Dreweatts have an ivory exemption license for this lot XYWLRLAY

A REGENCY LINE INLAID MAHOGANY MERCURY STICK BAROMETERJOHN GALLY, EXETER, CIRCA 1810With open triangular pediment above rectangular silvered Vernier scale annotated in barometric inches and with the usual observations beneath signature John Gally, EXETER to right-hand side opposing Fahrenheit scale spirit barometer to the left, set behind hinged glazed triple-line edged door over conforming line decorated caddy moulded trunk with visible tube, the rounded base with ring turned domed cistern cover.95cm (37.5ins) high, 13cm (5ins) wide. John Gally is recorded in Banfield, Edwin BAROMETER MAKERS AND RETAILERS 1660-1900 as working in Exeter circa 1810-30. Condition Report: The instrument has been recently serviced by a specialist for the vendor hence is fine working condition with good clean silvering to the register plate. The cistern cover is a replacement otherwise case is in very good original condition with only very minor age-related blemishes. Condition Report Disclaimer

A GEORGE III MAHOGANY MERCURY STICK BAROMETERFRASER, LONDON, CIRCA 1790With swan neck pediment over glazed silvered Vernier scale calibrated in barometric inches and with the usual observations beneath signature Fraser, London to upper margin, over caddy moulded flame figured trunk with Vernier setting square flanked by cavetto sides to throat, the rounded base incorporating cavetto-capped part-cylindrical cistern cover with shallow ogee dome underside.100cm (39.5ins) high, 16cm (6,25ins) wide. William Fraser is recorded in Banfield, Edwin BAROMETER MAKERS & RETAILERS 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. 

LATE 19TH CENTURY the domed brass cap above glazed cylindrical silvered vernier scale calibrated in inches (26.4 to 32.5), engraved with a crown and numbered ‘B.T. 213’, then signed Adie, London, the patinated brass and black enamel cylindrical shaft with vernier adjustment screw and concealed-bulb mercury thermometer with ivory Fahrenheit scale above canister shaped cistern, mounted via centre brass gimbal 90cm high, 8cm wide Note: Patrick Adie, son of the renowned Scottish Instrument maker Alexander Adie (1775-1858) is recorded in Banfield, Edwin, ‘Barometer Makers and Retailers 1660-1900’ as working from several addresses in London 1846-86. In around 1855 Patrick Adie and John Welsh of the Kew Observatory worked together to develop an improved design of marine barometer. Their design incorporated a sealed iron cistern and the tube featured dampening constriction and Bunten air trap. The thermometer bulb is enclosed within the frame to measure the temperature of the mercury within the barometer tube, the outer brass case offered increased protection compared to earlier wooden cased models.Sold in compliance with UK Government and APHA regulations, with (non-transferable) exemption registration reference  V3PP3T2TPlease be aware that this lot contains material which may be subject to import/export restrictions, especially outside the EU, due to CITES regulations. Please note it is the buyer's sole responsibility to obtain any relevant export or import licence. For more information visit https://www.defra.gov.uk/ahvla-en/imports-exports/cites/

Heath & Co Sextant 6 1/2" radius with Vernier scale, in mahogany case; together with a pair of Ross 7x50 Steplux binoculars (2)

A brass cased cylindrical Marine mercurial Barometer complete with gimballed mount and a hardwood wall-mounting board, the silvered scale reading in metric and imperial having a vernier reader adjusted by a milled wheel to the right hand side, 38 1/2'' long overall.

A mixed woods Mercury stick Barometer with light and dark-wood rope-style strung decoration and engraved "Bulgarani Fecit" and having a small glazed door giving access to the thermometer and the adjustable vernier type scale pressure-reader slide and having an architectural design pediment with a turned brass central finial. 38 1/2" high overall.

A Victorian oak Admiral Fitzroy's storm barometer by Negretti & Zambra, instrument makers to Her Majesty, circa 1870, having arched bevel glazed double ceramic vernier scales flanking the large bore mercury tube, each calibrated in barometric inches and with the usual observations, No. 1493, the trunk with vernier setting squares and applied glass mercury tube with Fahrenheit scale thermometer, further signed Negretti & Zambra London, h.102cmAll mercury good and intact, no bubbles.Vernier scale with several hairlines.Thermometer scale good.Left hand rise-and-fall scale in vernier scale not working.Oak case with some age wear but generally good.

A Victorian steel and brass vernier 9" radius octant by Norte & Wilson of Leadenhall Street, London, having ivory inset scale, in fitted mahogany caseIvory submission ref: 2NEFNUPD

Cameron & Blakeney Glasgow & Sunderland - Victorian rosewood marine stick barometer, the arched and canted three-piece scale reading from 27 to 31 ins, with Remarks and vernier above a mercury thermometer, brass weighted base and suspension ring, H95cm

Mrs Janet Taylor, 104 Minories, London, England - Victorian mahogany cased Sympiesometer c 1860, glazed mahogany case with a cavetto moulded pediment, rectangular silvered register and Fahrenheit temperature scale, hydrogen gas filled syphon tube and a separate sliding vernier calibrated in barometric inches, to the left a separate mercury filled Fahrenheit thermometer and makers signature beneath, circular rotating recording disc within a curved aperture.Mrs Janet Taylor is recorded as a barometer retailer and navigation teacher in London, England, 1845-1875.The Sympiesometer patented in 1818 by the Edinburgh barometer maker Alexander Adie was an improved version of Robert Hooke's Thermobarometer. The hydrogen gas in the syphon tube is affected by both the temperature and air pressure. In order to take a reading the temperature is taken from the thermometer and the sliding vernier adjusted until the pointer on the top of the vernier corresponds with the temperature on the register scale. The barometric air pressure is then read from the top of the fluid in the syphon tube. The Sympiesometer was thought to be a safer, reliable and more portable barometer for use primarily at sea. Dimensions: Height: 60cm  Length/Width: 10cm 

A Large & Unusual Vernier Calliper, English, c.1880, engraved 'TROUGHTON & SIMMS LONDON', the caliper constructed of brass with finely engraved scale in inches with vernier scales for inside and outside measurements, with vernier scale lock and fine screw adjustment in fitted French polished mahogany case with mounting blacks on the lid. case length 67.5cm

English, dated October 1891, engraved to the rear of the tripod foot ‘WATSON & SONS, 313 HIGH HOLBORN, London, 2740’ the microscope is arranged on a large tripod foot with cork filled pad feet, the body is supported on conical trunnions, plano-concave mirror to base on a gimbal, focusing substage collar with polariser notch cut to inside of collar, with fine focus screw adjustment, mechanical stage with full silvered engraved scale around circumference with solid silver vernier scales to X-Y movement, course focus via diagonal rack and pinion to rear of body tube, body tube with interchangeable drawer tubes, one plane the other with silvered top to accept analyser eyepiece, with rack and pinion focus to drawer tube, with 3 Watson Objectives and one by Zeiss, with 3 Watson Eyepieces, all in the original French polished mahogany case with lock and key, case height 40cm.The Earliest Known Watson Van Heurck Microscope?The first Van Heurck microscope sold by Watson & Sons was on 17th March 1891 No. 2641, the entry in the Watson Records (i) reads ‘Van Heurck Microscope, with divisions to stage’ this microscope was at the time very expensive with a price of £12.0.0.From the Watson records there were 4 Van Heurck microscope sold prior to No.2740. They are numbered 2641 (the first to appear in the sales record), 2688, 2706, 2718 (which was delivered 15 days later than the one offered in this listing). From the Watson record, this microscope, No. 2740 was sold 5th October 1891, the original entry reads ‘Van Heurck Microscope, rack to draw, cork feet’ and was priced at £13.10.0.We have been unable to locate any of the previous microscopes so must assume that this, No.2740, is the earliest known version of the famous Watson Van Heurck Microscope. Little Imp Archive https://littleimp.quekett.org/Watson2/index.htm

A GEORGE III MAHOGANY AND CHEQUER STRUNG STICK BAROMETERBy J. Colombo, 180 High Holborn, LondonWith an architectural pediment and glazed panel door, signed silvered scale with vernier and thermometer, above the trunk with turned reservoir cover96cm highCondition reportIn good condition.  The scale has some discolouration to the lacquer surface.

A GEORGE III MAHOGANY STICK BAROMETERBy W & S. Jones, Holborn, LondonThe swan-neck pediment with turned ivory finial, above glazed panel and signed silvered scale with vernier, plain trunk and turned reservoir cover at the base102cm highWilliam and Samuel Jones are recorded working 1784-1860.  See Sir Nicholas Goodison, English Barometers, Woodbridge 1977, p. 168.Ivory Declaration number: NA9KNKA4Condition reportIn good restored condition.

A GEORGE III MAHOGANY STICK BAROMETERUnsignedWith brass scale and vernier, above a plain column and oval cistern cover92cm highCondition reportIn restored condition.  The plate is not silvered.

A GEORGE III MAHOGANY STICK BAROMETERBy George Adams, 60 Fleet Street, LondonThe architectural pediment, above signed silvered scale with vernier, plain trunk above turned reservoir cover101cm highGeorge Adams succeeded to the business and Royal Appointment on the death of his father in 1772.  See Sir Nicholas Goodison, English Barometers, Woodbridge, 1977, p. 126.Condition reportIn good condition. There is an air bubble in the mercury tube. 

A GEORGE III SATINWOOD AND OUTLINED STICK BAROMETERBy George Stones, BlackburnThe arched pediment above a hinged glazed door, with signed silvered scale and vernier93cm highCondition report Veneer on hood is split in places.  A small veneer loss to upper side of cistern cover on right.

A 1930s Vernier scale, cased, various cased gauges, instruments and a light master metal, in brown leather case. (qty)

A quality Irish mahogany cased Stick Barometer, the arch top inset with etched dial, marked 'Yeates & Son, Opticians, Dublin' with thermometer and barometer scale, and sliding vernier scale, exposed glass tube and spherical cistern cover, approx. 89cms (35"). (1)

Ø A 10½IN. RADIUS VERNIER OCTANT BY E. & G.W. BLUNT, CIRCA 1810the ebony 'T' frame with inset ivory maker's plate and scale divided to 105º, brass index arm, pinhole sights and shades, contained within stepped keystone case with decorative lock plate -- 14in. (35.5cm.) wide, IDN: G2ZBL3V6Sclae time stained. Mirrors spotted. Case missing lock.Lot 237 & 238: please note that the images for lots 237 & 238 in the printed catalogue have been transposed. The octant on the left is 238. The octant in the middle is 237.  

Ø A 9½IN. VERNIER OCTANT BY HORNE & THORNTHWAITE, LONDON, CIRCA 1850with ebony pi frame with inset ivory scale and maker's plate, lacquered brass fittings including shades, mirrors, index arms, contained in keystone case with sighting tubes and maker's label -- 12in. (30.5cm.) wide, IDN: EAEKSYAL; together with A 1¾IN. ACHROMATIC THREE-DRAW TELESCOPE BY TROUGHTON & SIMMS, LONDON, CIRCA 1850, signed on the third draw as per title, the leather-covered main tube with lens cap and inscribed on the brass cuff with owner's name JOHN MACKRORY, LITTLE HALES, NEWPORT, SALOP, in fitted leather case -- 11in. (28cm.) cased (2)One leg detached.SALEROOM NOTICE: Lot 237 & 238: please note that the images for lots 237 & 238 in the printed catalogue have been transposed. The octant on the left is 238. The octant in the middle is 237. A Troughton & Sims telescope, c. 1840/50 is included with the octant in 238.

Ø A 9½IN. RADIUS VERNIER OCTANT BY GEORGE LOWDEN JUNIOR, DUNDEE, CIRCA 1840the ebony 'double T' frame with inset ivory maker's plate and scale divided to 105º, brass index arm, sighting tubes, seven shades, mirrors and wooden handle, contained within lined keystone case -- 12in. (30.5cm.) wide, IDN: 53WLV5Y1Good overall condition. Case has corner missing from base.

A FINE AND HIGHLY ORIGINAL PLATINUM-SCALED PRIZE SEXTANT FROM H.M.S. WORCESTER, 1886with lacquered and gilt ladder frame, signed, inscribed and numbered on the arc 'Henry Hughes & Son, 59 Fenchurch Street, London, Platina & Gold, no. 2914', scale divided to 150º, vernier with magnifier, adjustable telescope holder, mirrors and shades with oxidised facings, with wooden handle with brass lined stand socket, contained in fitted box with complete set of accessories including magnifying glass, rotating sight shade, screwdriver and five sighting tubes, the lid with test certificate dated '30th June 1886', an external dedication prize plate to 'Charles George Budge' -- 11½in. (29cm.) wideExtremely fine original condition. Apparently unused.

A 7IN. RADIUS VERNIER SEXTANT BY HEATH AND CO., LONDON, CIRCA 1916with oxidised brass bell frame, inscribed on the arc 'Made for H.G. Blair and Co., Cardiff & Barry' and numbered 'N 788', inset silvered scale, vernier with magnifier, 7 shades, with wood handle, contained in fitted box with complete set of accessories including binoculars, 4 lacquered brass sighting tubes and original test certificate inside lid, with gilt embossed leather outer case -- 11in. (28cm.) wideFrame spotted and would benefit from a clean. otherwise good overall condition. leather case dry and stained commensurate with age.

An early 20th century lacquered brass and cast iron Vernier type monocular microscope, the scale marked Philip Harris Ltd, Birmingham, England, height 27cm

A 20th century sextant by the 'Hezzanith' instrument works, number 68486, having a 9" brass vernier scale, with examination certificate dated 21st October 1968, in oak case with brass plaque to lid naming John Percy 5/4/1969, w.28cm

A Thomas Armstrong Brass Triple Ring Sextant, English, late 19th century,signed Thomas Armstrong & Brother, with silver scale and Vernier, magnifier, two sets of coloured filters, in fitted mahogany case with two telescopes, sextant 6 1/2in (16.5cm) radiuscase 5 1/4in x 10in x 9 1/2in (13.5cm x 25.5cm x 24cm) For further information on this lot please visit Bonhams.com

Early 19th century mahogany stick barometer by Francis Pelegrino Early 19th century mahogany stick barometer by Francis Pelegrino, silvered plate signed 'F. Pelegrino Fecit' with Fahrenheit mercury thermometer, manual vernier scale and seven weather predictions to the 27-31' scale, in a mahogany case with broken swan neck pediment and central brass finial, over a glazed door, with chequered strung borders throughout, terminating in a circular turned cistern cover98cm highGood overall condition, plate in good order and stringing all present. There is evidence of a small repair to the bottom left, see image.