CHM Revolution

Date Introduced

1800s

Photographer

Richards, Mark

Dimensions

1/8 x 6 1/4 x 2 3/4 in.

Credit Line

Courtesy of Gwen and Gordon Bell

Copyright Owner

© Mark Richards

Location

United States

Keywords

Analog; Navigation; Hand calculation; Proportional compass

Object ID

B169.81

An English-style sector, possibly intended for navigational calculations.