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Publication of GB529751ApublicationCriticalpatent/GB529751A/en
529,751. Gyroscopes. ASKANIA-WERKE AKT.-GES. June 7, 1939, No. 16693. Convention date, June 7, 1938. Drawings to Specification. [Class 97 (iii)] A gyro-rotor, particularly of an aircraft turn indicator, adapted to be driven by air jet and by electric motor, has impact blades on its circumference to receive impulses from a jet operated by pressure or vacuum, and the rotor of a direct or alternating current electric motor mounted on its spindle. Means may be provided for putting in one of the driving means automatically when the other fails, or both may be used together.