SURVEYOR’S SEMI-CIRCUMFERENTOR.

SURVEYOR’S SEMI-CIRCUMFERENTOR. Second half of the 18th century. Fashioned with a maple plank joined to a brass plate on which is engraved an 8-1/4″ protractor within which is mounted a trough compass in the center of the protractor. The sighting mechanism mounts on a screw with the original nut in the center of the base of the protractor, with sight vanes on each end and cutouts to read angles on the protractor. There is a receiving hole in the center of the base for a staff mounting bracket. See page 69 and Plate XXXII in M.V. Brewington’s “The Peabody Collection of Navigating Instruments” for a picture and description of a very similar American semi-circumferentor (dated circa 1730). Definition: a surveyor’s instrument used for setting out land or buildings to any angle and in preliminary survey work generally and made up of a horizontal graduated semicircle that surrounds a compass and is attached to a base with fixed vertical sights at each end and of a movable arm with vertical sights at each end that pivots on the center of the base. SIZE: 5-1/2″ h x 8-1/4″ l x 4-5/8″ d. CONDITION: All with old original surfaces. Appears to be in functioning order. Mounting bracket absent as previously noted. 9-99901 (1,500-2,000)

Auction: Fine Art, Antiques & Asian - August 2010

Please Note: All prices include the hammer price plus the buyer’s premium, which is paid by the buyer as part of the purchase price. The prices noted here after the auction are considered unofficial and do not become official until after the 46th day.

Image	Lot	Price	Description
	2391	$575.00	SURVEYOR’S SEMI-CIRCUMFERENTOR. Second half of the 18th century. Fashioned with a maple plank joined to a brass plate on which is engraved an 8-1/4″ protractor within which is mounted a trough compass in the center of the protractor. The sighting mechanism mounts on a screw with the original nut in the center of the base of the protractor, with sight vanes on each end and cutouts to read angles on the protractor. There is a receiving hole in the center of the base for a staff mounting bracket. See page 69 and Plate XXXII in M.V. Brewington’s “The Peabody Collection of Navigating Instruments” for a picture and description of a very similar American semi-circumferentor (dated circa 1730). Definition: a surveyor’s instrument used for setting out land or buildings to any angle and in preliminary survey work generally and made up of a horizontal graduated semicircle that surrounds a compass and is attached to a base with fixed vertical sights at each end and of a movable arm with vertical sights at each end that pivots on the center of the base. SIZE: 5-1/2″ h x 8-1/4″ l x 4-5/8″ d. CONDITION: All with old original surfaces. Appears to be in functioning order. Mounting bracket absent as previously noted. 9-99901 (1,500-2,000) Auction: Fine Art, Antiques & Asian - August 2010 Please Note: All prices include the hammer price plus the buyer’s premium, which is paid by the buyer as part of the purchase price. The prices noted here after the auction are considered unofficial and do not become official until after the 46th day.

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