CHM Revolution

Date Introduced

1920 ca.

Photographer

Richards, Mark

Dimensions

2 1/4 x 14 x 7 3/4 in.

Credit Line

Gift of Warren Yogi

Copyright Owner

© Mark Richards

Location

Russia

Keywords

Hand calculation; Mechanical calculation; Abacus

Object ID

102630015

Schoty calculators use varied bead colors and different numbers of beads on the rods.