Astronomical and navigational instruments

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Metal sheet

AST0991.64
Astronomical and navigational instruments

Object connections:

Collection Astronomical and navigational instruments
Gallery locationNot on display

Object details:

Object ID AST0991.64
Description Airy's Transit Circle. There are parts marked AST0991.1-66 which can be found via the Whole/Part toggle. Object glass 8.1 inches aperture, 11 feet 7 inches focal length, magnification 195 (180 for the Sun). Eye-end: originally 7 vertical fixed wires & 1 horizontal wire movable by micrometer; 6 additional vertical wires added in 1854 with introduction of chronograph to give 9 wires for galvanic registration & 7 for 'eye-and-ear': in 1891 a 10-wire galvanic system was introduced to simplify arithmetic: travelling wire micrometer fitted in 1915. Bohenberger nadir eyepiece for ascertaining level errors. Handle by window replaced by conservation department.
Date made 1851

Artist/Maker Troughton & Simms
Ransomes & May
Place made England
Credit National Maritime Museum, Greenwich, London
Measurements Overall: 31 x 10 x 1 mm
Parts
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