MORIN wrote that they only produced such instruments with cylindrical body because of their higher precision.Technical Data - Dimensions: 2.5 x 2.5 x 6 3/8 inch (65x65x162mm) - Weight: approx. (700 gr) - Sighting: The slots are equipped with horse hair reticles attached with screws.There were four different models vith various azimut scales (seen through the large viewer): two in angular mils (500 and 800), one in grades (1000) and a special one in 553 mils to measure the ammunition's side drift when shooting. The transit lock is the big knurled knob at the underside (pic. By turning it half a rotation, it pushes the magnetic needle upwards against the glass.
NOTE: Parts of the description above and the pictures below were sent by a friendly visitor. at r.) allows direct measuring of distances on the old French military maps whose scale was ,000) with a precision of 50m (compare with the ROSSIGNOL compass above). To this purpose, a slot located along the ruler serves as an aiming aid (sight line).This instrument doesn't feature a device to measure the elevation angles. of Bakelite casing: 58 x 40 x 17mm, - Reading of angle values via mirror and lens - Optical sighting aid: Stanhope-type lens with an engraved Mils scale on the flat end (pics. Dimensions : PROFILE - Former British compass maker."Spencer, Browning & Rust were optical and mathematical Instrument Makers who worked from 327 Wapping High Street (1784-97), 66 Wapping (1797-1840) London.We were told that this table can be observed through a tiny hole below the transit loop.This instrument features on one side: - a rectangular window in which the value of the azimuth angle shown by the compass card can be read by means of a prism, - two tiny tubes which build the clinometer: In one of them is a reticle (crosshair) like the Chinese compass displayed above while the other is a display of the elevation angle shown by the measuring unit (probably a wheel like the German compass above).