G. Charpentier of France
The Calculimetre was invented in 1890 by G. Charpentier of France and made by H.Morin, 11 Rue Dulong, 75017 Paris France. The Calculimetre, a metal circular slide rule, about 60mm in diameter.
Circular Slide Rule
The Calculimetre was invented in 1890 by G. Charpentier of France and made by H.Morin, 11 Rue Dulong, 75017 Paris France. The Calculimetre, a metal circular slide rule, about 60mm in diameter.
Circular Slide Rule