"The Gray Gasoline Engine , constructed by the Gray Motor Company of Detroit, Michigan, is of the four-cycle, stationary, hopper-cooled type, especially designed for farm use. It is built in four sizes 1-1/2 horse power, 2-1/2 horse power, 4 horse power and 6 horse power, which manufacturers claim are those most commonly demanded for agricultural purposes."
Gas Engines For the Farm, Copyright 1913, C. F. Hirshfeld and T. C. Ulbricht.
I bought that book (a reprint) off Ebay. I highly recommend it if you are into hit and miss. It describes the theory behind the Kingson carb, the Wico mag, the Secor-Higgins carb. and many others. I was fascinated at the many ways they found to overcome the problems of combustion in the early days.
I like hit and miss engines, but don't own one.Maybee someday
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