Fine Circular Protractor by William Cary, London c.1810

Victorian brass cased Aneroid barometer by Stanley, London. Brass cased aneroid barometer housed in the original leather fitted case. Silvered dial with original ‘blued’ st...

Vernier Nautical Sextant, G.W. Butters, London. A fine curved frame vernier sextant, the polished silver arc signed G.W. Butters, London. Eng...

Pre World War I Nautical Compass by E.S.Ritchie Nautical compass mounted by a brass gimbal into a copper brass bound case with sloping glazed aperture with heavily bevelled glass. Flat brass bezel with five holding screws signed ‘E.S.Ritchie’ and numbered 5779. Side opening compartment for a lighted wick with drawer beneath. The compass is mounted in a heavy painted brass bowl with very fine copper pivot supporting the floating direction card. A diaphragm is located in the base of the bowl for temperature compensation. E.S.Ritchie founded the business in 1850 to manufacture mechanical, electrical and scientific instruments. In 1857 he turned his attention to navigational instruments and begun making marine bearing compasses for the U.S.Navy before the American civil war. At the time the British admiralty dry mounted nautical compasses were considered by all navies and commercial shipping companies as the highest technological standard of the day, however, in 1860 Ritchie had received a US patent for the first successful and practical liquid-filled marine compass...

Pre World War I Nautical Compass by E.S.Ritchie Nautical compass mounted by a brass gimbal into a copper brass bound case with sloping glazed aperture with heavily bevelled glass. Flat brass bezel with five holding screws signed ‘E.S.Ritchie’ and numbered 5779. Side opening compartment for a lighted wick with drawer beneath. The compass is mounted in a heavy painted brass bowl with very fine copper pivot supporting the floating direction card. A diaphragm is located in the base of the bowl for temperature compensation. c.1910 E.S.Ritchie founded the business in 1850 to manufacture mechanical, electrical and scientific instruments. In 1857 he turned his attention to navigational instruments and begun making marine bearing compasses for the U.S.Navy before the American civil war. At the time the British admiralty dry mounted nautical compasses were considered by all navies and commercial shipping companies as the highest technological standard of the day, however, in 1860 Ritchie had received a US patent for the first successful and practical liquid-filled marine compass for general use. A major step forward in the technology of the compass. With the damping provided by the liquid, together with gimbal mounting, the floating card of the Ritchie compass...

These educational wheels, with copper and black painted surfaces, were used by Physics teachers in the late 19th century. Please note we have two of these wheels available. One i...

This is an antique vineyard setter's compass. A French, brass surveyor's instrument with mahogany case and stand, dating to the late Victorian period, c...

With hinged gnomon, hour ring and latitude arc, silvered compass rose with two inset bubble levels, raised on three levelling screws, in velvet lined and shaped leather covered case,...

A brass ship's inclinometer, circa 1910. Scale in degrees from the vertical to 40° of tilt/list. An inclinometer, or clinometer, is an instrument used for measuring angles of s...