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Date: |
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Description: | 5 H
No 5 Gilbert Made by Barrow 1844
Card- Mica covered with paper. White with black and white markings, graduated to 1/4 points, about one inch from edge is a circle of degree graduations with two rows of figures 0-9 quadrantally and 0-360 (for use with Gilberts azimuth circle).
Needle- Four heavy edge bar needles of laminated rolled steel, 2 x 7" and 2 x 5" long. They are mounted 1.75" apart and have bevelled ends, attached to a metal ring which is screwed to card. a light brass cross frame, attached to the two inner needles, is fitted at centre to carry pivot.
Pivot- Cone-shaped brass pivot cap with jewel at top, screwed through centre of cross frame.
caption: Record Shot - Do not reproduce. | Publisher: | "http://collections.rmg.co.uk/" | Rights holder: | "Royal Museums Greenwich" | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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