"Canivet - Proportion Compass - C. 1770"
Proportion compass signed "Canivet à Paris", that is to say by Jacques Canivet and datable to the end of its production around 1770-1774. The French proportion compass is the instrument of mathematics and engineering par excellence of the 17th and 18th centuries. This model is of classical design and of fairly simple style. It is engraved with seven scales: equal parts, calibers of the pieces, polygons, strings, solids, weights of the balls and metals. Good condition of the brass and engraving. 17cm closed. 
Le Magazine de PROANTIC
TRÉSORS Magazine
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