Sighting attachment for compass

Made:
1913-1939 in Glasgow
patentee:
William Thomson
maker:
Kelvin, Bottomley & Baird Limited

Sighting attachment, patt.57, for compass with Kelvin's Azimuth mirror replaced with prism, unsigned, (1913-1939). Based on William Thomson, Baron Kelvin's 1883 patent.

Details

Category:
Navigation
Object Number:
1939-375
Materials:
brass (copper, zinc alloy), glass, paint
taxonomy:
  • furnishing and equipment
  • vehicle - transportation
credit:
Admiralty Compass Observatory
status:
Permanent collection

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