Malcolm Thomson, son of Prof. Elihu Thomson, built three cars for his own use rather than for sale. The first, finished in early 1911, combined numerous components from his father's electric car with a two-cylinder air-cooled Logan truck engine, giving it a gas-electric character. His second car, completed in the fall of 1911, originally ran a two-cylinder, two-stroke Willett engine, later replaced with a four-stroke Pullman four-cylinder unit. The third…