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Sextant by Jesse Ramsden with case

Sextant by Jesse Ramsden with case

1770-1775
Surgical instrument case

Surgical instrument case

1890-1910
Twelve inch astronomical quadrant by Bird

Twelve inch astronomical quadrant by Bird

1760-1769
Instrument case, England, 1650-1700

Instrument case, England, 1650-1700

1650-1700
Brass quadrant with stand and case.

Brass quadrant with stand and case.

1771
Spectrometer, fitted with replica of Rowlands grating

Spectrometer, fitted with replica of Rowlands grating

1905-1907
Brass framed repeating circle with case.

Brass framed repeating circle with case.

1815-1825
Brass framed octant with case.

Brass framed octant with case.

1794-1801
Wooden thermometer case (thermometer missing)

Wooden thermometer case (thermometer missing)

1850-1924
Prospect glass (spyglass)

Prospect glass (spyglass)

1725-1735
Diamond-frame pattern sextant with case.

Diamond-frame pattern sextant with case.

1845-1855
Box for avoirdupois weights

Box for avoirdupois weights

1588
Brass framed sextant with case.

Brass framed sextant with case.

1775-1782
Red leather case for glass prism

Red leather case for glass prism

1845-1885
Miniature spyglass telescope with boxwood case

Miniature spyglass telescope with boxwood case

1725-1735.
Dark grey fishskin case for spyglass telescope

Dark grey fishskin case for spyglass telescope

1701-1800
Leather spyglass case with side-opening

Leather spyglass case with side-opening

1800-1817
Instrument case

Instrument case

1880-1920
Decorated cylindrical instrument case

Decorated cylindrical instrument case

Medicine scale in fish skin case

Medicine scale in fish skin case

1850-1920
Red leather case, for miniature spyglass

Red leather case, for miniature spyglass

1801-1900
Shagreen case for Volute compass

Shagreen case for Volute compass

1760
Elaborately engraved lancet case

Elaborately engraved lancet case

Accessories case for microdensitometer, 1978

Accessories case for microdensitometer, 1978

1978
Wooden case with moulded bronze covering with five bronze surgical instruments

Wooden case with moulded bronze covering with five bronze surgical instruments

3000BCE-100CE
Felt case for the largest of three double volvelles in brass

Felt case for the largest of three double volvelles in brass

Case, for four German hexagonal section measuring rods

Case, for four German hexagonal section measuring rods

1870-1880
Pocket cylindrical surgical instrument case

Pocket cylindrical surgical instrument case

500 BCE-500 CE
Case containing lancets and knife blades

Case containing lancets and knife blades

1801-1930
Lid only of pocket surgical instrument case

Lid only of pocket surgical instrument case

500 BCE-500 CE
Case for Micromap viewer, 1995-1998

Case for Micromap viewer, 1995-1998

1995-1998
Leather case for glass demonstration prism

Leather case for glass demonstration prism

1701-1800
Leather case for cataract knives from opthalmic instrument set

Leather case for cataract knives from opthalmic instrument set

1810-1850
Case for Bertrand type refractometer

Case for Bertrand type refractometer

1870-1893
Copy of surgical instrument box

Copy of surgical instrument box

1901-1936
Mahogany box for Differential Screw Micrometer

Mahogany box for Differential Screw Micrometer

1801-1811
Folding opera glasses, French patent, in velvet case

Folding opera glasses, French patent, in velvet case

1850-1950
Red leather case lined with black velvet for spyglass

Red leather case lined with black velvet for spyglass

1831-1900
Mahogany case for planimeter patented 1904 by Connolly Brothers

Mahogany case for planimeter patented 1904 by Connolly Brothers

Pocket surgical instrument case

Pocket surgical instrument case

500 BCE-500 CE
Leather case for single opera glass

Leather case for single opera glass

1800-1848
Pocket box sextant with leather carrying case (damaged), made by Elliott Brothers, 30 Strand, City of Westminster, London, England. 1855-1865. Consists of two circular lacquered brass plates with lid that acts as a handle when used. Fitted with Inlaid silver scale (-5° to 165°) with 30' divisions and a silver vernier (1' div.). The index arm is rotated by a milled knob on the upper plate with two filter shades (red & green) operated by lever. The index glass is fixed with adjustment for the horizon glass. Fitted with magnifier (single lens) on hinged 40 mm swivel arm and choice of a large and a small pinhole. Marked 'Walter I. Tatham' on lid (possibly owner).

Box type pocket sextant with case.

1855-1865
Ball recording sextant with brass and alloy frame and plastic handle in rectangular fitted wooden box with a leather strap, made by the Mergenthaler Linotype Company, Brooklyn, New York, USA, 1944. Consists of scale (0° to 90°), on reverse, with 1°’ divisions and micrometer (1’), day and night telescopes (236mm) and no filter shades. In use, the celestial body is viewed directly and instead of a plumb bob, a falling steel ball records the altitude on a screen, and is read off the scale and micrometer.

Ball recording sextant with case.

1944
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
Opera glass telescope, 'Galilean' type, gilded brass, 2-draw tube with ivory body and red leather covered wooden case with silk lining, by George Dollond, London, 1820-1840.

Opera glass telescope with gilded brass tube and leather case

1820-1840
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
Repeating circle (Borda circle) made by Etienne Lenoir, Paris, France, about 1780. Circular polished brass frame, limb and fittings, a wooden handle. Signed on one of the struts: Lenoir AParis no. 53. Brass scale from 0° to 720° every 20'. Two brass verniers to 1', zeros at the right. The index arm carries the index glass; the telescope arm carries the horizon glass. The tangent screw is on the front of the index arm; the clamping screw is on the back. A second tangent screw and clamping screw are on the back of the telescope arm, at the objective end. Three detached index shades (all red); two detached horizon shades (red and green), all the shades are secured by thumb screws. Magnifier on a 60 mm swivelling arm. Index- and horizon-glass adjustment by square-headed screws and a detached key. Two bubble levels are fixed at a right angle on the front of the telescope arm. Telescope (170 mm), inverted image, two parallel cross-wires, is fixed on two telescope brackets, with perpendicular adjustment on both by rising-pieces and milled knobs. A round plane mirror (probably not original to this instrument), a diaphragm, an adjusting key, and a screwdriver. A square, fitted oak box with the remains of a leather carrying handle.

Borda type repeating circle with case.

1775-1785
Repeating circle (Borda circle) made by George Dollond, London, abut 1850. Circular anodized brass frame, polished limb, a wooden handle; a detached U-shaped bracket holds a second handle. Signed on the bottom of the index arm: Dollond | London. Inlaid silver scale from 0° to 720° every 20' (the digits are engraved in brass). Two silver verniers to 20", zeros at the centres. The second scale is to 180° every 5° on either side of 0°, engraved in brass. The index arm carries the index glass; the tangent screw, working against a spring-loaded stop, and the clamping screw are on the back of the index arm. Three index arms, moving with a brass scale and the second vernier on the inside of the limb; they carry the telescope and the horizon glass. One arm has a tangent screw, working against a spring-loaded stop, and a clamping screw on the back of the arm. Index-glass adjustment by a screw; adjustment of the horizon glass by screw and capstan screw. Three index shades (two red, one green); three horizon shades (two red, one green). Two magnifiers on 65 mm swivelling arms. Threaded telescope bracket with perpendicular adjustment by rising-piece and a milled knob. Telescope (96 mm) erect image; telescope (158 mm) inverted image, four cross-wires; extra draw tube ( 50 mm) inverted image, four cross-wires; extra draw tube (48 mm) inverted image, four cross-wires. Sight tube 84 mm); shaded eyepiece (red). Square fitted mahogany box containing in the lid a trade label for J.D. Potter, 31 Poultry, London.

Borda type repeating circle with case.

1845-1852
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
Brass sextant with black lacquered frame, polished brass limb, wooden handle and fitted with gyroscopic artificial horizon invented by French Admiral Fleuriais, and made by Hurlimann, Ponthus and Therrode, Paris, France, 1910-19. Consists of inlaid polished silver 126° scale (-5° to 107°) with 20’ divisions and silver vernier (30”), three index-filter shades (red, green & orange), two horizon filters (orange), scale magnifier on 70mm swivelling arm. Fitted with threaded telescope bracket for sighting telescope (191mm – upright image). Supplied with horizon light, magnifier, adjusting key and other accessories with circular brass box and mahogany case with manuscript instructions. The artificial horizon consists of an airtight housing containing a gyroscope that can be locked with a lever mechanism. The gyroscope has a glass piece through the body, with a series of horizontal lines, and is propelled by an air pump. The air gauge is calibrated from 0 to 76 cm of mercury.

Brass sextant with gyroscopic artificial horizon and case.

1910-1919