Antique , US WWII , D.W. Brunton’s and Ainsworth & Sons, pocket Compass .

Antique , US WWII , D.W. Brunton’s and Ainsworth & Sons, pocket Compass .

U.S.A. 1940s

Size 7 x 7 x 3 cm

A precision instrument made by Wm Ainsworth & Sons of Denver Colorado, with a serial number 61687.

Military-Geological & Topography Compass- This item is used, but works perfectly.

BRUNTON COMPASS

A Brunton compass, properly known as the Brunton Pocket Transit, is a precision compassmade by Brunton, Inc. of Riverton, Wyoming. The instrument was patented in 1894 by Canadian-born geologist David W. Brunton.[1] Unlike most modern compasses, the Brunton Pocket Transit utilizes magnetic induction damping rather than fluid to damp needle oscillation. Although Brunton, Inc. makes many other types of magnetic compasses, the Brunton Pocket Transit is a specialized instrument used widely by those needing to make accurate navigational and slope-angle measurements in the field. Users are primarily geologists, but archaeologists, environmental engineers, mining engineers and surveyors also make use of the Brunton's capabilities. The United States Army has adopted the Pocket Transit as the M2 Compass for use by crew-served artillery.