This gyro compass is ex Australian Navy. The unit is internally lit and has an electric motor for stabilisation. I am unsure of the voltage, phase and current of the motor so have not powered it up but it looks clean and tidy – see photos. The compass has a hard enamal type paint which I have removed off the electrical cover to show the brass beneath. A sample of this unit is on display at the Royal Greenwich Museum with the description below: “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. – extract from Royal Greenwich Museum“ Specifications: Condition: Used Type: Brass Electric Gyro Stabilised Marine Compass Repeater Make: Admiralty Pattern Series: Mark V Gyro Compass Model: 1900-M Serial: 8775 DOM: 1945 Diameter: 250mm Bezel: 200mm diameter Construction: Brass Mount: Gimbal Weight: 11.8kg Sold AS IS.
