CHM Revolution

Date Introduced

1955 ca.

Photographer

Richards, Mark

Dimensions

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

Manufacturer

Pickett

Credit Line

Courtesy Gwen and Gordon Bell

Copyright Owner

© Mark Richards

Location

Japan

Keywords

Oughtred, William; Analog; Hand calculation

Object ID

B1657.01

Circular slide rules eliminated the “off the end” problem because the scales wrapped around continuously.