This Company attempted unsuccessfully to market a steam roadster called the MacDonald Bobcat but the car failed to catch on. Closed models were also offered, but most MacDonald engines were ultimately used for those who wished to convert their gasoline cars to steam.
The MacDonald Steam Automotive Corporation was active in 1923 and 1924. It may have been a successor or somehow related to the Gearless Motor Company. Future research will resolve these issues.
Duncan MacDonald was the President and General manager of the MacDonald Steam Automotive Corporation. As early as 1930, Duncon MacDonald was working with Jeffrey Carqueville to produce a steam car. Duncan MacDonald was in Los Angeles, CA by then and as late as 1935 was still working on steam cars. His car was featured in a press photo dated January 1936. More research on Duncan MacDonald will clarify these relationships.