Construction
It had two large eight feet diameter wheels with three feet wide treads, located at the front on each side of the substructure. These wheels were made out of several sheets of pressed steel and were not specially manufactured, being of the type used on Holt agricultural machinery of the period. At the rear was a roller wheel to be used for steering. A small skid plate or tail was attached to this roller to assist in trench-crossing. Both front wheels were driven by individual power units which consisted of a Doble 2 cylinder 75 hp steam engine and Doble kerosene fired boiler.
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