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A Fine Pair of Compass Dividers by Charles Augustus Schmalcalder, English, c. 1815, in brass and steel, combination dividers engraved 'Schmalcalde...
Charles Hoare's Double Slide Rule for the Iron & Steel Trade, English, late 19th century, in boxwood and brass, two slides with scales A, B, C ...
An Ivory-mounted Compass by Nairne & Blunt, English, c. 1780, of small size, enamel 16 point compass rose further divided, agate pivot, signed 'Na...
A Slide Rule by James Tree,
A Slide Rule by James Tree, English, c. 1835, in boxwood, entitled 'Scale for Weight of Malleable Iron plates and Bars' with scales for breadth i...
Ewart's Cattle Gauge Slide Rule, English, c. 1832-1842, in boxwood with ivory slide, stamped 'The Cattle Gauge & Key to the Weighing Machine arra...
A Curta II Calculator,
A Curta II Calculator, Liechtenstein, 1970, by Contina Ltd, no. 558212, black and grey in black case.
A Boxwood Clinometer Rule by Stanley, English, c. 1900, in boxwood and brass, with inset magnetic compass, protractor hinge divided to one degree,...
A Rare Proell Pocket Calculator or New Slide Rule, English, c 1901-2, complete with card and celluloid scales, instruction manual and cloth case,...
A Complex Double Slide Rule for Acreage, English, mid-19th century, in boxwood, unsigned, logarithmic scales calibrated in perches, roods and acre...
An Early Fuller's Calculator Model No. 1, an unusual example, possibly c. 1880 signed only on the scale cylinder 'Stanley, Maker, London, Entd. ...
An American Surveyor’s Compass, late 18th century, engraved ‘C. M.’ to side and dated ‘1790’ to underside, wooden body of circumferentor, with eng...
An American Surveyor’s Compass, late 18th century, unsigned, wooden body of circumferentor, with engraved graduated brass scale 0-90-0, trough com...
A Ferranti Pegasus Computer Plug-In Package Unit, English, c. 1960, with an aluminium label for 'FERRANTI 07-p-00730', wired pre-printed electroni...
A Bohemian Equinoctial ring Dial, sundial with one quadrant graduated 0-90, chapter ring I-XII-XII marked for half-hour, engraved to reverse with ...
Large 2in Telescope Astronomical Transit Instrument, English, c. 1870, signed in script along the rear barrel ‘J. H. Dallmeyer, London’, standing ...
A Hand-held Becquerel Phosphoroscope, French, C. 1860, signed in script J. Duboscq a Paris', consisting of a lacquered brass chamber with a hand t...
An Early Electric Arc Lamp,
An Early Electric Arc Lamp, English, c. 1880, signed on a plaque to the base 'F. J. Cox, 26 Ludgate Hill, London', standing on a French polished ...
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