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Description: | PATENT No 2559// LONDON POLARIS//DOBBIE McINNES Ltd GLASGOW & SOUTH SHIELDS
THE LONDON POLARIS // (PATENTED AND REGISTERED) // INSTRUCTIONS ...........// HEATH & COMPANY LIMITED.......
Consists of a silvered brass bearing plate 8" (20.3cm) dia., graduated quadrantally in degrees, by semi-circles 0-180-0-180, and to 1/4 points. The plate can be rotated and set to the ships head against a lubber mark carried on the gimbal ring. At the centre of the bearing plate there is a vertical shaft carrying a dial, graduated by semi-circles 0-180, 0-180 and in hours, which can be tilted to latitude against a scale carried on its underside. Hinged sights are fitted to an alidade pivoted at the centre of the dial. One of the vanes caries crosswires, and the other a curved plate with crossed slits. A pointer attached to the lower end of the vertical shaft indicates the bearing of the sun on the bearing plate. Mounted in a brass gimbal ring 8.5" (21.6cm) dia. which carries a scribed lubber mark. Mounted in wooden box with lid fitted with a clinometer on one side and a leather carrying strap.
AUDIT - Lid needs part numbering.
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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