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Nautical interest. A G Bradner, 82 Minories, London mahogany cased octant together with a box of nautical instruments to include two rolling rulers, small by A. G. Thornton, large by Capt. Field's Improved, W & HC compass divider points, magnifier etc.

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

An early 19th century Maritime Octant sextant, unnamed brass and mahogany body, ivory register 0-90, 46cm x 37.5cm, c.1810Ivory submission reference 4DKVQX69

Octant. James Hughes London ca. 1820. Nautical navigation instrument, with which the vertical angle between a celestial body and the horizon is measured. An octant is one eighth of 360º = 45º. Was most commonly used until 1767, then succeeded by the sextant. It is an invention of John Hadely, 1682-1744, 10 cm high

Spencer Browning & Rust. A Late 18th/Early 19th Century octant sextant with original box. By Spencer Browning & Rust, London.

Ebony and brass octant, navigational instrument, c. early 19th century. Complete with all filters and sighting fittings, lacks makers brass plate and scale, 35cm x 29cm.Recovered from a shipwreck on the Isles of Scilly c1890 by a prominent Scillonian pilot, and found in his attic following his death.

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

Spencer Browning & Rust. A Late 18th/Early 19th Century octant sextant with original box. By Spencer Browning & Rust, London.

Antique early 19th century brass and Ebony octant marked E Cohen, Newcastle

A Victorian octant by James Imray & Son of London, late 19th Century, originally lacquered brass but with later finish applied, the body with two sets of filters and interchangeable eyepieces, the arm with microscope reader, 24.5cm high, in fitted mahogany case with paper retailer's label for John Bruce & Sons Marine Opticians

A Victorian brass mounted ebony octant with ivory scale, 36cm. Condition - poor, glass filter cracked and other minor damage overall. Ivory submission reference THSXLF51

Nautical interest: 19th Century octant in an fitted oak case; the frame of dark ebony and polished brass; the graduated ark and maker's mark of ivory and inscribed 'Heather London'; paper label 'William Heather, chart and map seller'; written inscription 'For use of Harrow school from Spencer P. Butler 1881' (29cm x 34cm ). Ivory submission reference: ZZNB3LEA.

A 19th Century ebony octant, maker 'D McGregor & Co, Glasgow & Greenock', lacquered brass radius arm on an A-frame inset ivory scale calibrated to 105° and ivory name plate as per title, fitted mirrors and shades, together with accessories in a mahogany keystone case.* ivory exemption licence VJU1EHVU

A 19th century octant, the brass and silvered scale indistinctly signed, lignum vitae grip, 27cm wide

A brass octant, by Henry Barrow & Co, London, silvered scale, 22cm wide

A 19th century ebony and brass octant. The central panel reads Owen Owens Liverpool, length 31cm.

Oktant. England, um 1800, unsigniert, Ebenholz mit Beineinlagen und zaponierten Messingmontierungen, Grad-Teilung auf Bein, ein Fernrohransatz, fünf Filter, in originalem Holzkasten aus Mahagoni, mit alten Siegelmarken. Maße des Holzkastens: ca. 33 x 30 x 12,5 cm.An octant. England c. 1800, not signed, ebony with bone inlays, lacquered brass, bone degree scale, one telescope, five filter, in original mahogany case with parts of old seals. Dimensions of the case c. 33 x 30 x 12.5 cm

An ebony and brass octant. Circa 1850, height 29cm, in a mahogany stow case, with labels for Chas W. Price, Bristol, and Wilson & Gillie, North Shields.Ivory exemption certificate: NS2RFFB2 One of the brass stands is off with an associated chip to the ebony which is present, very soiled throughout and the brass is tarnished, lacking an extra eyepiece. All moving parts are free. Images of affected areas online.

ROSS, LONDON; a small brass octant inscribed with the maker's details and dated 1917, in associated shaped and brass inlaid box.Condition Report: Missing the objective mirror, and the eyepiece connector is loose, box is slightly worn but intact

X J. HUGHES, LONDON; an ivory inset ebony and brass octant with two additional telescopic eyepieces and rosewood handle, in fitted mahogany case. CITES Self Certification No. 3H9CCN2A.Condition Report: Brassware is dull and tarnished with areas of verdigris, originally lacquered with only small traces remaining, ivory measurement markers are clear and visible, although there is a crack by the no. 40 and possible crack from the left had side, with a small chip missing by the makers tab, otherwise appears complete and functional

X A 19th century French ivory set ebony and brass octant in fitted case, with paper label inscribed 'Exposition 1844 Fabrique Colombi Opticien De La Marine, Brevete'. CITES Self Certification no. HRBDA7HL.Condition Report: Missing two section mirrored sighting pane, the measurement markers on the ivory are clear and visible, the brass has slight tarnishing, wooden finish is dull otherwise appears ok

X J. MANN; an 18th century ivory inset ebony and brass octant, inscribed to the sliding arm 'J.Mann Maker Liverpool', and further inscribed to the inset ivory tab 'William. Lindsey', in fitted box with remnants of paper label to the lid. CITES Self Certification No. J1PQ98CT.Condition Report: The brassware has a dull finish throughout and the box is coming away to the left-hand side and bottom right corner

Antique naval ebony octant

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

Engeland, ebbenhouten octant in kist, 19e eeuw; Uitgevoerd met koperen indexarm, stelschroeven en filters. h. 30 cm, b. 25 cm [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 Georgian mahogany brass mounted octant with ivory inlay, 40cm wide (CITES Submission reference 183KT4NW)

WWII Luftwaffe Libellen Oktant (Dragonfly Octant) for use on German aircraft, in original box

A Victorian ebony and gilt-brass vernier octant, by John Crichton, London, second half 19th century, the ivory inlaid scale graduated to 105°, with vernier graduated to 20° and inset ivory plaque inscribed Crichton London, with three sight shades, horizon mirror and index mirror, in mahogany case bearing makers label and Great Exhibition label of 1851, octant - 30cm high, 24.5cm wide  Ivory submission reference: W7KCCD5M    Please note that Roseberys do not guarantee the working order of any scientific instrument. Footnotes: Note: The era of modern navigational instruments was ushered in by the concurrent invention of a doubly reflecting instrument by Thomas Godfrey (1704-1749) of Philadelphia and John Hadley (1782-1744) of London in the early 1730s. Originally this instrument was referred to as 'Hadley's quadrant' after the English inventor. Today it is known as an octant, the name given it by Godfrey. The instrument proposed by Hadley and Godfrey resembled the quadrant in shape but contained an arc of only forty-five degrees, one eighth of a circle. In addition, it had two mirrors which reflected the light of the sun or a star and enabled the observer to measure altitudes (the angle between the sun, the moon or a star or planet above the horizon) up to ninety degrees. This ability to measure large angles made the instrument especially useful for celestial navigation at sea.

NAVIGATIONAL OCTANT. A late 18th/early 19th century ebony & brass navigational octant by Spencer, Browning & Rust, London. Named on ivory slip beneath ivory finial (pencil missing). The ivory curved scale worn & loose. 17ins/43cm. Pine tapering case with stepped lid & printed paper trade label for 'J. Hughes, Real Manufacturer of Sextants, Quadrants, Compasses & Telescopes, 16, Queens Str., Ratcliffe Cross, London. Ivory exemption licence ref: K38GMK4L.  Please note that all items in this auction are previously owned & are offered on behalf of private vendors. If detail on condition is required on any lot(s) PLEASE ASK FOR A CONDITION REPORT BEFORE BIDDING.  The absence of a condition report does not imply the lot is perfect.WE CAN SHIP THIS LOT, but NOT if part of a large, multiple lots purchase.

A good quality modern commemorative mariner's octant by Burke & Jones of Bristol with brass mounted fitted mahogany case

A brass and ebony octant. Early 19th century, contained in an oak case, height 36cm. Ivory exemption ref no BB4XARQ4

AN EBONY AND LACQUERED BRASS OCTANT BY RICHARD LEKEUX, CIRCA-1800 Inset with ivory plaque reading "Made by RICHd LEKEUX, No. 137, near Execution Dock Wapping London" and scale divided to 90 degrees; measuring approx. 33.5cm in height overall and housed in a wooden keystone case, retaining key. Ivory declaration reference: SGNUZYFD Condition Report:Available upon request

A George III mahogany and brass 19 inch radius octant by William Gibbons: the 'T' frame with inset ivory nameplate inscribed as per title, with ivory inset arc calibrated to 95°, fitted brass mounted mirrors and shade.* Ivory exemption licence number KN3V5ABW

Ø A 17½IN RADIUS VERNIER OCTANT, DUTCH, CIRCA 1755the mahogany 'T' frame with arc sandwiched between brass plates, the front divided to 90º, brass index arm, vernier scale with central '0', arm stop, fore and aft pinhole sights, mirrors and two pad rests -- 20in. (51cm.) high overall; together with a 13½in. radius example in ebony signed Heather London (old losses and wear overall), IDN: MJLVS1NJ(2)Dutch: inset maker's plate missing, scales much worn, but just readable; index arm loose but secure, main pinhole sight bent, lacking interchangeable shades, missing one pad foot;Heather: both pinhole sights bend, lacking mirrors (plates only), lacks shades, lacks pencil, no case.

Ø AN 11½IN. RADIUS VERNIER OCTANT BY SPENCER, BROWNING & RUST, LONDON, CIRCA 1840the ebony 'T' frame with inset ivory maker's plate and scale marked 'SBR' to centre, brass index arm, pinhole sights and shades, contained within stepped keystone case with decorative lock plate -- 13½in. (34.5cm.) wide, IDN: YH9XLF88; together with a surveying level for the Board of Ordinance; and a telemeter in a leather case(3)

Ø A 9½IN. RADIUS VERNIER OCTANT BY KEEN AND FRODSHAM, LIVERPOOL, CIRCA 1840ebony 'T' with inset ivory maker's plate and scales, braced index arm, pinhole sights, contained in keystone box with trade label for Janet Taylor & Co. -- 13in. (33cm.), IDN: V7MRVJWZ; together with a 1in. three draw wood and brass telescope in card tube, and a 4in. aneroid barometer(3)Pinhole sight bent, shades missing, lid detached.

Ø A COLLECTION OF NAVIGATIONAL INSTRUMENTS comprising a brass sextant by Griffin in keystone box; a heart pattern sextant; ebony octant, with later scale; two roller rules; a parallel rule; and a station pointer, IDN: TC9GV9U8(a lot)

19th century cased octant by Walker Brothers of Liverpool, 10ins radius, measures 0-100 degrees, ebony frame with brass arms and fittings, inlaid ivory scale (Please note: Franklin Browns have applied for a de minimis exemption licence for the ivory in this lot RR7RM25E)

X A 19th century Thompson Yarmouth octant, ebony body, coloured glass, brass fittings and ivory cards, length 34cm, in shaped box (af).Condition Report: Cites self declaration ref H5WPPTP5

An early 19th Century octant by Cary, circa 1830, with ebony frame and limb, brass indexing arm and fittings, an inset ivory scale & nameplate, Dolland type back adjustment, with turned finial unscrewing to reveal a pencil within, and cmplete with original oak case, the octant 24.5cm wide x 30cm highIn good condition, some minor oxidation to the lacquer and also to the mirror plates, the pencil not original, the case with knocks and marks and some small losses and signs of repair, overall condition consistent with age and use.

MARITIME, antique ebony framed octant in remains of original casing

An early 19th century Macassar ebony octant with brass mounts. Three coloured glass filters length 30.5cm.

A decorative painted wooden gilt decorated novetly ships octant, titled Stewart & Son, 109 x 95cm

A 19thC octant, by Winter of Newcastle upon Tyne, the label and numbered sections are ivory, 33cm long.

Diderot, Denis, and d’Alembert, Jean de, bound plates and text from Encyclopedia, ou dictionaire raisonne des sciences, des arts et des mtiers, comprising of 7 plates titled 'Astronomie' showing astronomical calculations, how to use an octant, and other equipment, along with a further 26 pages from the same book showing an armillary sphere, various astronomical calculations, globes, telescopes, eyepiece micrometer, folio, printed Paris 1762-1777

An ebony and ivory octant,mid 19th century, by Norie & Co, London, with an ivory scale and name plate, housed in a fitted ebonised case stamped 'S.F. Harrison', 9.5inches wide (24cm) IMPORTANT NOTEThis lot contains elephant ivory material. Please be advised that several countries, including those in the EU and the USA, now prohibit the importation of ivory items unless under specific conditions. Accordingly, prospective buyers should familiarise themselves with the relevant customs regulations of their country and ensure they are able to import this item prior to bidding.This item has been registered as exempt from the UK Ivory Act 2018, on account of it being made before 3 March 1947 with less than 10% ivory by volume. Ivory declaration submission reference: CQ14N495.Condition ReportRegister 8 plaque worn, paper label to inside of case worn, discoloured and with losses.Case worn, catch missing, wooden panels loose.

TIBBETTS, G.R. Arab navigation in the Indian Ocean before the coming of the Portuguese. 1971. W. fold. maps & charts. Obrds. -- C.A. DAVIDS. Zeewezen en wetenschap. De wetenschap en de ontwikkeling v.d. navigatietechniek in Ned., 1585-1815. (1985). Obrds. w. dust-j. -- W.F.J. MÖRZER BRUYNS. Schip recht door zee. De octant in de Republiek i.d. 18de eeuw. 2003. Obrds. -- J.-B.Ph. Dictionnaire de marine. Avec huit planches. (Repr. 1831. 1998). Lge-8°. Ocl. w. dust-j. -- Added: R. GLEBOCKI & A. ZBIERSKI, ed. On the 300th anniversary of the death of Johannes Hevelius. 1992. Ocl. w. dust-j. -- And 11 o. (16).

Englischer Oktant von Gilbert, London, um 1790Ebenholz und Messing, Limbus mit eingesetzter Skala aus Bein, Teilung 5-100°, Alidade 0-20°, eingesetzte Plakette "J. Gilbert, Tower Hill, London", 1 Diopter, 3 Spiegel, 3 Filter, Maße 33 x 40 cm. Leichte Abplat-zungen an der Plakette und der Alidaden-Skala. Start Price: EUR 280 Zustand: (3-4/-)English Octant by Gilbert, London, c. 1790Ebony frame and brass fittings, inset bone scale divided 5-100°, bone vernier scale divided 0-20° from right to left, inset plaque "J. Gilbert, Tower Hill, London", 2-hole peep sight, 3 mirrors, 3 sunshades, size 13 x 15 3/4 in., minor losses on plaque and vernier scale. Start Price: EUR 280 Condition: (3-4/-)

Englischer Oktant von Crichton -London, um 1850Ebenholz und Messing, Limbus mit eingesetzter Skala aus Bein, Teilung 5-100°, Alidade 0-20°, eingesetzte Plakette "Crichton - London", 1 Diopter mit 2 Öffnungen, 2 Spiegel, 3 Filter, Maße 26,5 x 30 cm. Start Price: EUR 300 Zustand: (3/3)English Octant by Crichton - London, c. 1850Ebony frame and brass fittings, inset bone scale divided 5-100°, bone vernier scale divided 0-20° from right to left, inset plaque: "Crichton - London", 2-hole peep sight, 2 mirrors, 3 sun shades for the index mirror, 10 ½ x 11 4/5 in. Start Price: EUR 300 Condition: (3/3)

An 11" radius ebony, brass and ivory octant, 19th century, probably by Henry Hughes of London, of typical form with brass index arm, inset ivory scale calibrated from 0 to 105 degrees, three round sun filters, three square horizon filters, two horizon mirrors and pinhole sight, in fitted mahogany case with paper label for "H. Hughes" of London (case at fault) Please note this lot is offered for sale in accordance with the Ivory Act 2018, Trevanion Auctioneers & Valuers LLP have applied for a de minimis exemption licence for the ivory in this lotRef: 884HNQDE

Pâris (Louis-Michel). Cartes Élémentaires d'Astronomie et de Géographie, par M. l’Abbé Pâris, Falaise: chez Brée frères, Paris: chez Marcilly, Rouen: chez le Lecrêne-Labbey, [1807], 40 (of 42) hand-coloured engraved numbered cards (lacking cards 41 & 42), depicting various astronomical and geographical diagrams, plans and instruments, each verso with explanatory note in French, some light spotting, occasional generally minor marks, card 23 (a volvelle card) without its moving part, card 1 a little rubbed to blank area, each card 97 x 62mm, with original folded sheet of printed rules, contained together in original card slipcase with lift-off lid (rubbed with some wear), printed paper label to front, with engraved vignette of a globe, telescope and octant (browned and rubbed with some loss to edges) QTY: (1)NOTE:Louis-Michel Pâris (1740-1806) was a French priest and teacher who produced these cards as a teaching-aid for his pupils. He first engraved and coloured the almost identical (although slightly smaller) set published by John Wallis in London in 1795: Pâris lived there for several years at the end of the 18th century before returning to France. He then had this French set produced 'chez Brée frères', which additionally contained three volvelles: cards 23 (here present but without the moving part), 41 & 42 (neither present here).

A brass octant by Henry Barrow & Co London in a later box plus two brass ships bells

A mixed lot, comprising: a clear glass lustre, 26cm high; a set of six Waterford 'Coleen' pattern wine glasses, (two chipped); an Old Sheffield plate basket; a pair of electroplated knife rests; a Samson desk stand; and a reproduction brass octant.

A 19th century German ebony and brass octant by W. Ihlder of Bremerhafen, the frame with inset bone scale and maker's plaque, fitted with coloured filters, mirror and handle, length 30.5cm.Buyer’s Premium 29.4% (including VAT @ 20%) of the hammer price. Lots purchased online via the-saleroom.com will attract an additional premium of 6% (including VAT @ 20%) of the hammer price.

A 19th century Macassar ebony octant with ivory insert, brass mounts and three coloured filter lenses, 'Prince & Co outfitters 11 Leadenhall St', height 32cm.

A 9½IN. RADIUS OCTANT BY SPENCER BROWNING & CO., LONDON, CIRCA 1840the ebony T-frame with plates signed as per title and inset arc scale divided to 100° and SBR mark at 50°, braced index arm, pinhole sights, two mirrors, five shades, pin feet, contained within keystone box -- 12¾in. (32.5cm.) wideGood overall condition.