Schickard Calculator

Schickard: the device shown is a replica of a "Schickard Calculator"(no artifacts exist) created from drawings left by Wilhelm Schickard (1592-1635) who was a Professor of Hebrew, Oriental Languages, Mathematics, Astronomy, Geography and a Protestant minister in the German town of Tubingen. The machine incorporates a set of "Napier's bones" (on the cylinders) and a mechanism to add the partial products (with a carry mechanism).