CHM Revolution

Date Introduced

1920 ca.

Photographer

Richards, Mark

Dimensions

5 x 14 x 5 1/2 in.

Manufacturer

Odhner

Credit Line

Courtesy Gwen and Gordon Bell

Copyright Owner

© Mark Richards

Location

Sweden

Keywords

Odhner, Willgodt T.; Baldwin, Frank S.; Pinwheel; Mechanical calculation

Object ID

B135.80p

Odhner machines were the first widely adopted “pinwheel” calculators.