Early chart divider of brass with iron tips in fine condition with irreducible engravings. Catalog: NM.5-21 Date: 17th century L: 7 cm Signed: not signed Origin: unknown Condition: perfect for its age, in working condition, wear consistent with age and use

Remarkable navigational protractor with cross piece in a green baize lined mahogany case. With a 0-360 degree scale and four 0-90 degree scales in the quarters. Diameter 30.6 cm. Made by Chas. Smith, London and used by the War Department. Catalog: NM.5-19 Date: 1900-1920 D: 30.5 cm (1 foot) Case: Signed: C.S © Ltd. And…

Artificial or mercury roof horizon, rectangular black-lacquered cast iron trough with pouring hole and brass-framed roof-shaped cover with clear glass panels. Round iron bottle filled with mercury with stopper and iron funnel, in fitted wooden carrying box, signed and made by Sewill, maker tot he Royal Navy, Liverpool. Only a few copies of Sewill are…

Very rare nautical slide rule made of plywood by A. M. Gordon, Glasgow, Scotland. With ‘scales of power & speed for proposed vessels on measured mile trials’ and ‘scale of IHP constant’ on the other side. Catalog: NM.5-12 Date: ca. 1910 HWL: 0,5x34x9,5 cm Signed: A.M. Gordon, M.I.N.A. Baltic Chambers, Glasgow Origin: Scotland Condition: perfect

Nice quality single draw telescope with two bras tubes, sunshade and good optics. Eye and objective lensos with a protective shutter. The mainbody is clad with leather and has taken on a nice antique patina, polished over the years. Both lenses have a sliding lens protector. The window displays flags and pendants of the British…

A very fine brass clinometer in original mahogany case. Clinometers have a variety of uses. With this type of clinometer the angle of inclination of a ship can be measured very accurately. For this purpose in still water, along the quay, a heavy weight is moved abeam with the loading equipment. The values found are…

The sextant consists of two black lacquered round plates, the upper having an ivorine overlay. The handle is screwed into the bottom plate. The mirrors are between the plates. One mirror and the pinhole vane have a fixed position. The index mirror is moved by moving the index arm on the overlay. The position of…

Beautiful complete Stuart distance meter made by Hughes in mahogany box. The distance meter was used in convoy sailing or to maintain a safe distance from a hazard. For detailed information on how to use the distance meter, see https://sextantbook.com/2012/07/13/a-stuart-distance-meter/ Catalog: NM.5-01 Date: ca. 1910 HWL case: 5x20x12 cm Signed: Hughes & Son Ltd, London…