Thornycroft Military Oil Tractor

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“In this machine a petrol or paraffin engine drives a water—ballast roller through the medium of a clutch, a simple form of change—speed gear—box, and a single roller chain. The leading roller, by which steering is effected, is also filled with water, in order to obtain the dead weight necessary for rolling.” —Encyclopaedia Britannica, 1910


Encyclopaedia Britannica (11th ed., vol. 18) (New York, NY: The Encyclopaedia Britannica Company, 1910)


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