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The camshaft and magneto were driven by the crankshaft through a three-member train of spur gears (see Figures 9, 10 and 11).
The cam-shaft is hollow, and serves as a channel for the conveyance of lubricating oil to each of the camshaft bearings.A History of Aeronautics|E. Charles Vivian
The camshaft construction was considerably altered from the 1903 design.