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quadrant, universal

NAV1443

Object connections:

Collection
User collections Longitude punk'd by hfinch-boyer
Gallery locationNot on display

Object details:

Object ID NAV1443
Description Brass quadrant 9.75" (24.8cm) radius, graduated 0-95 by 15'. Fitted with an index bar (telescopes missing) carrying a vernier reading to 1'. A compass 3.25" (8.2cm) dia., graduated to 8 points and to 360 degs, is mounted at centre of quadrant. Brass T-shaped bracket for two spirit levels (levels missing). The quadrant is carried on a universal mounting consisting of a vertical and horizontal arc. The vertical arc is attached to an "A" frame mounted on a horizontal plate which can be rotated through 360 degs, graduated 0-180-0-180, fitted with a vernier reading to 1degree. All movement is by rack and pinion. A popular tool used by surveyors for land measurement. This example has a compass for determining direction and a geared movement for fine adjustment.
Date made circa 1730

Artist/Maker Sisson, Jonathan
Place made London, England
Credit National Maritime Museum, Greenwich, London
Materials brass
Measurements Overall: 175 x 320 x 300 mm
Parts
  • quadrant, universal (NAV1443)
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