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Description: | PATT. 1900 M N.o 8870 MT56
SERIAL N.o 8870 / MT/56 / A.P. 1900 M
This gyrocompass repeater has a brass bowl that contains an electric motor for driving the compass card. The bowl is set in gimbals and has two lamp-holder fittings on either side and a card adjustment control at the side. The compass card has a diameter of 8 inches (203 mm) and is divided into degrees, with additional figures printed in reverse for the use of a horizon ring with the repeater. There are also markings at the cardinal and half-cardinal points.
The repeater was originally part of a gyrocompass system used on HMS ?Triumph?, which was decommissioned in 1981. The repeater would have been linked to a master unit, from which the compass reading came. Gyrocompasses were first successfully developed at the beginning of the 20th century as a solution to the problems of magnetic variation and deviation that are inherent in magnetic compasses. They use the properties of spinning gyroscopes which keep the compass pointing in a fixed direction, usually Earth?s true north.
caption: Admiralty Pattern 1900 M
caption: Record Shot - Do not reproduce. | Publisher: | "http://collections.rmg.co.uk/" | Rights holder: | "Royal Museums Greenwich" | Subjects: | distant reading compasses Gimbal Triumph 1944 | Source: | Royal Museums Greenwich | Identifier: | http://collections.rmg.co.uk/collections... | Go to resource |
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