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Circular protractor
Circular protractor with beam compass, brass with silver (?) scales.
Protractor-Dia. 6.25" (16cm) graduated to 360 degs by 30'. A straight edge 10.1" (25.6cm) long, formed by the frame of the instrument, is carried at the centre.
Beam compass-Length 14.6" (37cm) with pins at each end, is mounted on frame with two index arms with vernier scales and attached at centre of instrument.
Vernier scales-#two scales graduated 15-0-15 to 2' of arc are attached to ends of index arms. One of the arms carries a tangent screw and clamp.
Protractor-Dia. 6.25" (16cm) graduated to 360 degs by 30'. A straight edge 10.1" (25.6cm) long, formed by the frame of the instrument, is carried at the centre.
Beam compass-Length 14.6" (37cm) with pins at each end, is mounted on frame with two index arms with vernier scales and attached at centre of instrument.
Vernier scales-#two scales graduated 15-0-15 to 2' of arc are attached to ends of index arms. One of the arms carries a tangent screw and clamp.
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Object details
| ID: | NAV0584 |
|---|---|
| Type: | Circular protractor |
| Display location: | Not on display |
| Creator: | Jones, Thomas, & Sons |
| Date made: | circa 1800 |
| Credit: | National Maritime Museum, Greenwich, London |
| Measurements: | Overall: 40 mm x 372 mm x 175 mm |