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Date: |
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Description: | Thomas Jones & Sons. Charing Cross London
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.
AUDIT - object needs marking with its NAV number. | Publisher: | "http://collections.rmg.co.uk/" | Subjects: | circular protractors | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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