Hand operated calculator for number games - has juxtaposed numbered wheel and freely rotating numbered polyhedrons

摘要

The hand operated calculator for use in games involving numbers consists of a case containing juxtaposed wheels (6,7,8) and juxtaposed polyhedrals (10). The wheels have a series of numbers round their periphery (11) and the polyhedrals, which can rotate freely on a common axle (17), have a number on each face. A plate can be dropped down at the back of the case to lock the polyhedrals in a selected position. The front of the case has windows through which the number selected by the rotation of the wheels and the numbers on the polyhedrals can be seen.