This engine is a 1906 MacDonald steam traction engine, built by MacDonald Manufacturing Co., Stratford, Ontario. The engine is rated 18 HP and is an 8 x 10 engine of rear mounted design. MacDonald engines were built in Canada under license by A. D. Baker Co. of Swainton, Ohio.
The early MacDonald's were almost identical to the same vintage Baker's, but later MacDonald's have distinct differences. This engine is serial #8. Probably fewer than 500 MacDonald engines were built and only six are known to remain today.
They were built in 18, 20, 22 and 25 HP sizes. They feature water bottom boilers on the small sizes.
This engine is owned by John Hoover and sons of Box 135, Everett, Ontario L0M 1J0, who provided the information above.