The Davidson Automobile Battery armored car was a further development of the Davidson-Duryea gun carriage, but with steam power. It was built by Royal Page Davidson and the cadets of the Northwestern Military and Naval Academy in Highland Park, Illinois. Davidson designed this vehicle in 1901. He and his students at the Northwestern Military and Naval Academy built two of these partially armored military vehicles. They were armed with Colt .30 caliber machine guns. The vehicles were powered by a tubular steam boiler. They had difficulty in going up hills because of changes of the water level in the boiler. Davidson made these lightly armored military vehicles of one thousand pounds at the Academy campus in Highland Park, Illinois. These two partially armored military vehicles were labeled