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Synchronization gear
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==== The Betteridge gear ==== [[File:Aerial Warfare 1914-1918 Q66257.jpg|thumb|A synchronized Vickers gun fitted to a test stand; an electric motor drives a structure that simulates the propeller]] The C.C. gear was not the only hydraulic gear to be proposed; in 1917 Air Mechanic A.R. Betteridge of [[No. 1 Squadron RAAF|No.1 Squadron Australian Flying Corps]] built and tested a gear of his own design while serving with his unit in Palestine. No official interest was expressed in this device; possibly the C.C. gear was already in prospect.<ref name=Woodman12a>Woodman 1989, p. 193.</ref> The illustration seems very likely to be of the test rig for this gear.
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