CHM Revolution

Date Introduced

1902

Photographer

Richards, Mark

Dimensions

3/8 x 11 x 1 1/4 in.

Manufacturer

Keuffel & Esser Company

Credit Line

Gift of Tom McIntyre

Copyright Owner

© Mark Richards

Location

United States

Keywords

Oughtred, William; Analog; Hand calculation

Object ID

X170.83B

An early example of slide rules used by generations of engineers, with a sliding metal "indicator." Glass indicators were more popular after about 1910.