07-16-2011 07-16-2011
Skinner Auctions
Skinner Auctions Marlborough MA
2555M Marlborough
July 16, 2011 10:00 AMCalender

Brass and Wood Circumferentor

Auction: Clocks, Watches & Scientific Instruments - 2555M Location: Marlborough Date / Time: July 16, 2011 10:00AM


Brass and Wood Circumferentor, American, late 18th century, the 7 1/2-in. dia. maple circle with brass ring around the circumference calibrated 0-45 in eight segments, brass sighting vane with central thumb screw pivot, inset blued steel needle under glass with brass keeper, thumbscrew for keeper function and socket for tripod attachment on the underside all in an associated coopered box, dia. 9 in.
Estimate $400-600

vertical sighting vanes now gone, brass in old surface, appears to retain the original glazing,


blued steel needle