Consists of a triangular wooden frame fitted with three shelves on a wooden turntable 63 x 21.25 x 21.25" (160 x 54 x 54cm).
Description of equipment from ACO Catalogue:
"This American remote indicating compass has three-element inductor system in which three "Fluxgates" are used to determine the direction of the Earth's field. The Fluxgates are indicator elements in which an alternating current is used to excite on a mumetal core. When such an element is subjected to a magnetic field, a second harmonic flux is generated and this, when cutting a secondary winding on the element, produces a second harmonic voltage which defines the sense and magnitude of the applied field. The output of three such elements arranged in the form of a horizontal equilateral triangle provides three horizontal components of the Earth's horizontal field. This triangular assembly of Fluxgates is mounted on a gyroscope whose sole purpose is to provide a horizontal platform. This assembly is the transmitter, which is essentially a magnetic compass. The second harmonic output from the transmitter is taken to a variable transformer in the master indicator and, after amplification, the output from this transformer drives a follow-up system so that an indication of direction is given on a suitable dial. Differential mechanisms aloow corrections for variation and deviation to be applied. Transmission to other repeaters is effected by a magnesym transmitter driven by the master indicator. This compass, although designed for aircraft was also used in P.T.boats.