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Murray's Radial Set Square
The instrument consists of a semi-circular brass protractor 4.0" (10.1 cm) radius, graduated 0 - 90 - 0 by 1 degree, with a tranaparent centre intersected by hair lines, and with a set square at an angle of 90 deg made to radiate around the arc. In the middle of the set square can be clamped a steel tape, length 23.5" (59.7 cm), graduated 1 - 24 inches, so fitted that one edge radiates from the centre of the instrument.
In a fitted wooden box which has instructions for use pasted on the lid and inside the lid.
In a fitted wooden box which has instructions for use pasted on the lid and inside the lid.
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Object Details
| ID: | NAV0141 |
|---|---|
| Type: | set square, radial |
| Display location: | Not on display |
| Creator: | Nath J. Holmes, Nath J |
| Date made: | circa 1877 |
| Credit: | National Maritime Museum, Greenwich, London |
| Measurements: | Overall: 8 mm x 220 mm x 136 mm |