Single Opera Glass by Chevalier, with helical focussing, in leather case, Chevalier family, France, 1800-1848. Single Opera Glass by Chevalier 1800-1848
Compound (two lenses) magnifying reading glass with painted silver plated brass body, in cardboard black leather covered cylindrical case, unsigned, European, 1800-1899. Compound magnifying reading glass in leather case 1800-1899
Miniature spyglass telescope with ivory and tortoiseshell tube and incomplete (lid missing) cylindrical fishskin case, unsigned, European, 1776-1800. Miniature spyglass telescope with cylindrical fishskin case 1776-1800
Hand-held Asterioscope in brass mount in red leather morocco case, by Murray and Heath, 43 Piccadilly, London, England, 1850-1880. Consists of fine diffraction grating rulings on glass in rotating frame, thought to be an optical toy in the manner of the kaleidoscope. Asterioscope in leather case 1850-1880
Prospect glass (spyglass) telescope with silver-plated metal body, 1-draw metal with shutter lens covers (front one missing) in fishskin case, unsigned, European, 1730-1750. Prospect glass (spyglass) telescope in fishskin case 1730-1780
Pair of pocket field binoculars, 'Trieder Binocle' model, x3 power, in velvet lined leather case, by C. P. Goerz, Berlin, Germany, 1910-1926. Supplied by W. Gregory, 51 The Strand, London. Fitted with dual lens focus and side slide intra-ocular adjustment . Pair of field binoculars with case 1910-1926
Large brass framed hand magnifying glass with 12-inch focal length (305mm), in tooled leather case case (incomplete - lid missing), unsigned, German, 1700-1750. Brass magnifying glass in leather case 1750-1750
Folding opera glasses, French patent, in purple velvet case, unsigned, Europe, 1850-1950 Folding opera glasses, French patent, in velvet case 1850-1950
Surveyor's quintant invented by George Beck and made by M. Dawson, Plymouth, about 1780. Polished brass frame, a detached wooden handle. Signed on the index arm: M,, Dawson fecit | Plymo Dock No 6. Marked on the index arm: G. Beck Invt. Polished brass scale from -10° to 205° every 30', measuring to 193°. Brass vernier to 1', zero at the centre. The double-ended tangent screw and the clamping screw are on the back of the index arm. No shades. Two index glasses, adjustment by screws; adjustment of the horizon glass by two levers and a milled clamping screw. A partly silvered sight vane with a peephole is fixed next to the index glass; a second sight vane on a swivelling arm is fitted on the centre strut. In a shaped mahogany box. Brass framed surveyor's quintant with case. 1775-1785
Brass lacquered sextant with straight-bar-pattern, 24 pillar frame, polished brass limb, wooden handle with counterbalanced tripod pillar stand and mercury artificial horizon in wooden box, all by John and Edward Troughton, 136 Fleet Street , London, England, 1790-1800. Consists of brass 127° scale (-5° to 140°) with 20’ divisions and brass vernier (10”), three index-filter shades (red & green), two horizon filters (red & green), scale magnifier on 90mm swivelling arm. Fitted with threaded telescope bracket for sighting telescope (182mm – inverted image) with 2 extra draw tubes, 131mm sighting tube and other accessories. The fitted rectangular case has in the lid the trade card for J. & E. Troughton. The artificial mercurial horizon consisting of a rectangular wooden trough fitted in a tin tray and a brass-framed, roof-shaped cover with glazed side panels, unsigned, made later, 1845-55. Brass framed sextant with stand, artificial horizon and case. 1790-1800
Hassler's reflecting circle, 11-inch diameter with counterpoise stand, by Troughton, London in case, no key [RAS No.43, Sheepshanks No.17]. Presented to the Royal Astronomical Society in 1857 by Miss Anne Sheepshanks sister of Rev. Richard Sheepshanks. Hassler type reflecting circle with case. 1790-1826
Gyroscopic sextant very probably made by Carl Plath, Hamburg, Germany, about 1943. Marked on the left side of the casing: Seekreiselsextant | Gerat 616-42A | Hersteller gtl. Casing of grey and black-lacquered aluminium and artificial materials, with black plastic fittings, housing optical equipment, a clockwork averaging mechanism, electrical equipment, and a rubber eyecup. Four shades, no. 2 is missing (all grey). Three batteries, of which two are incomplete (one is possibly from another instrument); a battery charger; eight spare light bulbs (2,5 volt); two blue light bulbs (110 volt), one possibly from another instrument. The bayonet handle is stored separately (hazard). In a fitted wooden carrying case containing in the lid printed handling instructions in German by the Deutsche Seewarte. The case is marked on the outside: 6380. Aircraft gyroscopic sextant with case. 1941-1945