The 540 rpm was the speed of the pto on the IHC 10-20 and it sort of set the standard. As and earlier respondent pointed out IHC was the first to provide a pto as an option. However, the 10-20, 15-30 and later standard tractors used a threaded pto shaft. The Farmall (later known as the Regular) was the first to use the 1-3/8" splined shaft. If one looks at harvester etc. parts books in the 1930s and early 1940s there are an enormous variety of shaft positions, shaft speeds and shaft types and al;l sorts of pto couplings were required for the different tractors. Similar chaos held in the shaft shielding. The 1927 (1928) standard was the first attempt but the 1938 American Society of Agricultural Engineers standard put things into a semblance of order. They still left two shaft sizes, 1-3/8" for the smaller tractors and 1-3/4" for the larger tractors. Still lots of choices on couplings. IH in about 1943 standardized all their pto shafts to the 1-3/4" to simplify farmers life.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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