THESE notes are concerned only with the aspect mentioned in the title, and no attempt is made to add to the vexed and controversial subject of types of indicating unit.
Hempson, J.G.G. (1943), "Electrical Indicator Drives: Methods of Synchronizing Cathode Ray Oscillograph Engine Indicators", Aircraft Engineering and Aerospace Technology, Vol. 15 No. 4, pp. 98-99. https://doi.org/10.1108/eb031005
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