Carrying case for sighting attachment
Carrying case for sighting attachment, patt.57, for compass with Kelvin's Azimuth mirror replaced with prism, unsigned, 1883-1939
- Object Number:
- 1939-375/1
- type:
- case
Sighting attachment for compass, with carrying case
- Made:
- 1913-1939 in Glasgow and United Kingdom
- patentee:
- William Baron Kelvin Thomson
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), paint and glass
- Measurements:
-
overall: 158 mm x 223 mm x 235 mm, .8kg
- type:
- sighting attachment
- credit:
- Admiralty Compass Observatory
Parts
Sighting attachment for compass, patt 57
Sighting attachment for compass, patt 57, No781
- Object Number:
- 1939-375/2
- type:
- sighting attachment
