CHM Revolution

Date Introduced

1800 ca.

Photographer

Richards, Mark

Dimensions

3/4 x 12 1/8 x 1 1/8 in.

Manufacturer

Dring and Fage Makers, Ltd.

Credit Line

Courtesy Gwen and Gordon Bell

Copyright Owner

© Mark Richards

Location

United Kingdom

Keywords

Oughtred, William; Analog; Hand calculation

Object ID

XB108.80

This four-sided rule for revenue calculations had room for more scales.