Azimuth circle prism testing thread

Azimuth circle prism testing thread. Two cylindrical weights joined together by red thread.

Object Details

ID: ZBA0093.1
Type: Azimuth circle prism testing thread
Display location: Not on display
Creator: Unknown
Date made: Unknown
Credit: National Maritime Museum, Greenwich, London
Measurements: Overall: 7 mm x 45 mm x 11 mm
Parts: Azimuth circle
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