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…

Bliss log with four blade propellor and 200 feet line. Taffrail type with sling pattern leg. Tibular register with three dials on porcelain face, stamped 38 under the dials. Rotator with four blades and stamped John Bliss & Co. Patented in 1876. Wooden box with label on the front site and instructions for use on…

Improved Taffrail Log with integrated flywheel, made by T.S. & J.D. Negus, Pearl Street, New York. Gray painted brass body with enamel dial reading up to 100 miles and subsidiary dial reading up to 10 miles. With a four bladed, brass rotator stamped with initial N and Negus New York. Incorporates short length of log…

Graphometers were used by cartographers and hydrographers to measure horizontal angles. This large graphometer, 38 cm wide, with compass is in a very good condition. The main directions on the compass are fully marked with Nord, Sud, West en Ouest. The two scales are engraved by hand. The instrument is made by Etienne Lenoir (1744…