Jacob Leupold
Jaco Leupold (1674–1727) was a German scientist, instrument maker, physicist and mathematician wrote Theatrum arithmetico-geometricum, the best illustrated work on calculation and measurement published during the eighteenth century.The encyclopedia describes and illustrates the calculating devices and machines of Kircher (Schott), Grillet, Leibnitz, Poleni, along with Napier’s rods and several calculation tables.Leupold designed his own version of a calculating machine, but no prototype was ever built due to his untimely death....