Complex. The Fordson succeeded in being cheaper to maintain than horses, as the Ford Model T had previously done. A government test concluded that farmers spent $.95 per acre plowing with a Fordson compared to feeding eight horses for a year and paying two drivers, which cost $1.46 per acre. Despite several early design flaws and reliability issues such as engine failure and unbearable heat, the Fordson established a firm foothold on U.S. farms, with more than 70% market share in earlier years. By mid-1918, more than 6,000 Fordson tractors were in use in Britain, Canada, and the United States. In the U.S., Ford established a policy in 1919 to loan Fordson tractors to educational institutions with vocational training programmes. Agricultural colleges could use a Fordson for six months and then exchange it for a new one. Under this arrangement, forty-two tractors were loaned to such universities as Cornell, Idaho, Michigan, Maryland and Prairie View State Normal in Texas. Others went to the orphanage at Nacoochee Institute in Georgia, the Berry School at Rome, Georgia and Camp Dix at Hutchinson, Kansas. Annual production reached 36,781 in 1921 and 99,101 in 1926. By 1925, Ford had built its 500,000th Fordson tractor. Ford was the only automotive firm to sell cars, trucks, and tractors simultaneously from 1917 to 1928, during which time 552,799 Fordson tractors were built. Operation Like the Model T car, a Fordson tractor that was relatively new and well maintained would start easily in warm weather. Under such conditions, often a single crank pull would start it. However, in cold weather, starting could be difficult, especially once the machines were 10, 20, or 30 years old and worn out. In cold weather, the oil congealed on the cylinder walls and on the clutch plates. The engine had to be hand cranked repeatedly with great effort. Strong men took turns cranking between intervals when individual ignition coils were adjusted. Sometimes farmers would build a fire under the tractor to warm up the crankcase and gear boxes to make it crank easier. The tractor, when in use, was fueled by kerosene, but gasoline was required to start it. The Fordson could pull discs and plows that would require at least four mules to pull, and it could work all day long, provided the radiator was continually filled, the fuel replenished, and the water in the air filter tank changed. The carburetor