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Drafting arm
This instrument consists of two sets of parallel bars with an elbow joint midway. At one end is a pivot hole to secure to a flat surface. On the other end is a graduated dial, 0-360, with two rules, one on either side of the dial, that can revolve in azimuth. There are also two separate rules, one plastic and others aluminium.
Parallel bars: 26"; 22" (66cm & 56cm)
Circle diameter: 5.5 (14cm)
Rules: 2 x 10", 1 x 14", 1 x 14" (plastic)
Parallel bars: 26"; 22" (66cm & 56cm)
Circle diameter: 5.5 (14cm)
Rules: 2 x 10", 1 x 14", 1 x 14" (plastic)
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Object Details
| ID: | ACO1246 |
|---|---|
| Type: | Drafting arm |
| Display location: | Not on display |
| Creator: | Research Engineers Ltd |
| Date made: | Unknown |
| Credit: | National Maritime Museum, Greenwich, London, Admiralty Compass Observatory |
| Measurements: | Overall: 72 mm x 925 mm x 175 mm |
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