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Description: | Card-Mica covered with paper, black with white and black markings, graduated to 1/4 points and quadrantally in degrees. Card has 2" dia. hole at centre fitted with rubber disc in which pivot cap is set.
Needle-Four edge bar needles, 2 x 7.15". 2 x 5.25" in length, attached to card by a brass ring. A brass strut with two balance weights is fitted across the diameter of ring.
Pivot- The central aperture in card carries a brass ring in which is fitted a rubber disc at the centre of which is set a cone-shaped jewel cap.
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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