3 HP gas engine by Backus Water Motor Company.
These engines were built by Backus Water Motor Company, Newark, New Jersey. From a catalog dated January 1, 1901. Courtesy of Robert L. Lefever, 135 Strasburg Pike, Lancaster,' Pa. 17602. (1) (2) , (3)
The photo was taken at the HES Show held at Burton, Ohio on August 4, 1978.
For a look at this machine in its' pre-restored state, check the photo on page 20 of November-December 1977 issue of G.E.M.