Although it is often assumed that the vehicle was a
tadpole configuration (with two driving wheels at the front), a senior Holt executive and the Aberdeen Proving Ground's report state that it was a
delta configuration (with the large wheels at the rear), and that the vehicle drove like a conventional agricultural tractor. The two driving wheels were in diameter with treads, and a diameter roller, used for steering, was sited at the front. The rear wheels were made from pressed-steel sheet, the same as those used on Holt agricultural machinery of the period. A small plate was attached to the roller to assist in crossing trenches. Each rear wheel was driven by a
Doble two-cylinder steam engine and a Doble kerosene-fired boiler. The vehicle's armament comprised 2 6-pounder (57 mm) cannons, mounted in
sponsons, and two machine guns. Its riveted armour plating was between six and fifteen millimetres thick. ==See also==