Gyro-magnetic compass, Mark III, consisting of: 1) Detector 2) Master indicator 3) Pilot's compass 4) Control panel 5) Amplified, used in aircraft navigation, by H. Hughes and Son Limited, England, 1930-1947
Detector unit, Type A, in three sections showing magnetic coils, by H. Hughes and Co Limited, England, 1930-1947
Master indicator, Type A, to be fitted to navigator's station, by H. Hughes and Son Ltd., London, 1930-1947
Gyro Unit, Type A, pilot's compass driven by electrical high-speed gyro-wheel with glass-covered compass-face, by H. Hughes and Son Ltd., London, 1930-1947
Gyro compass panel, Type A, with switch for compass and direction indicator, by H. Hughes and Son Ltd., London, 1930-1947
Amplifier, Type A, used to contain the electrical equipment for the gyro-magnetic compass and to amplify detector signals, by H Hughes and Son Ltd, London, 1930-1947
Outer casing for Gyro Unit, Type A (Pt3), pilot's compass driven by electrical high-speed gyro-wheel with glass-covered compass-face, by H. Hughes and Son Ltd., London, 1930-1947.
Outer casing for Master indicator, Type A (Pt2), to be fitted to navigator's station, by H. Hughes and Son Ltd., London, 1930-1947
Outer casing for Amplifier, Type A (Pt5), used to contain the electrical equipment for the gyro-magnetic compass and to amplify detector signals, by H Hughes and Son Ltd, London, 1930-1947