Societe des Lunetiers 'Universal' Map Measurer c.1910 Grenades and diagrams showing the trial

and diagrams showing the trial firing results

Khaki card cover with black titling

The use of an 11-screw ring in this compass suggests it dates from around the time of the earliest version of the Unicus

with no maker's marks

Societe des Lunetiers 'Universal' Map Measurer c.1910 Grenades and diagrams showing the trialAn antique 'S L' (Societe des Lunetiers) 'Universal' map measurer, made in France, and dating from the early 20th century. With a nickel plated brass case, 35mm diameter white dial, blued needle, and a removable screw threaded handle. Also known as an Opisometer, this is an instrument for measuring lengths or distances on maps, with the dial calibrated in 1 2 inches to the mile and centimeteres to the kilometre. Although mainly intended for use with