Many of the early tractors were nothing more than a hit and miss engine with wheels. The first tractors the International Harvester Company built were simply one of their horizontal engines mounted on a rolling chassis. These were called “friction drive tractors” because the engine slid on the frame and into a friction wheel to drive the tractor. The 25 Horse Power Portable Engine in this video was built by the International Harvester Company in 1915. The engine powered a planing mill in Pennsylvania from 1937 until it was sold at auction in 1997. Watch the video to hear the full story! Visit classictractorstv.com/about/ for more Classic Tractor Fever!