THE CALCULIMETRE CHARPENTIER, French, c.1900, signed “Calculimetre, G. Charpentier, Brevete S.G.D.G.” The 2-3/8″ (6 cm) diameter calculator is made of nickel silver and brass, divided with logarithmic, square root, tangent and sine scales on both sides, the suspension affixed to twin cursors and a frontal circular scale. A milled edge allows one to rotate the main body against this suspension assembly. Condition is fine, the surface somewhat cleaned and scratched. The Charpentier calculator, a fine pocket slide rule, is
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