For those interested in the automotive components of early tanks and AFVs, this article may be of interest.  “Final Drive for Combat Vehicles” is from the May-June issue of the Ordnance Journal and it examines the transmissions and final drives that were in service in 1921.  Despite the use of the term “combat vehicle” in the article title, the authors seem more interested in artillery tractors than tanks.  Having looked through a number of early 1920’s issues of Ordnance Journal, it seems there was much more work and interest shown to artillery tractors and self propelled artillery development than to tanks in the immediate post WW1 era.

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