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Prism, Steering
A steering prism known as Pattern 21 for use with Pattern 22 compasses. The magnifying prism is mounted in a glass-fronted metal case which is secured to the bezel by screws. A lever is fitted at one side to adjust the angle of the prism.
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Object Details
| ID: | ACO0096 |
|---|---|
| Type: | Prism, Steering |
| Display location: | Not on display |
| Creator: | Johnson Ltd; Edward John Dent & Co. |
| Date made: | circa 1907 |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 70 mm x 110 mm x 105 mm |