336,795. Indicating and recording torsional vibration of shafts. Gerard, I. J., and Carter, B. C, Royal Aircraft Establishment, South Farnborough, Hampshire, and Mansell, H. C, Rathgar, Ashley Road, Walton‐on‐Thames. Oct. 17, 1929. No. 31565. [Class 106 (ii).] Dynamometers, rotary transmission: with recording‐apparatus.—Comprises a construction of the type in which the torsional vibrations of a shaft are used to tilt a mirror reflecting a beam of light on to a screen of photographic plate.
(1931), "Month in the Patent Office: A Selection of the More Important Aircraft and Engine Specifications Published Recently", Aircraft Engineering and Aerospace Technology, Vol. 3 No. 3, pp. 76-76. https://doi.org/10.1108/eb029382
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