Can't say for sure what it was on the F-series, but it was pretty much standard for the letter series, except for the very earlies ones, and certainly was standard in '47.
Two types.
For the magneto-fired tractors, it was a single pole switch with a wire running to the side of the mag. With the button down, the mag was grounded, keeping the tractor from running and stopping it if it was. With the button up, it broke the connection to ground leaving the mag free to fire the plugs. The earliest As and Bs (and maybe the Hs and Ms --not sure of that) had a lever that ran forward to mechanically ground the mag to kill the engine. The switch replaced that setup.
On battery ignitions, it was a two-pole switch. Up, it completed the circuit to provide juice to the coil so it could fire. Down, it broke that connection.
The switch cases and buttons look pretty much alike. The difference is in their guts and function.
The originals and reproductions read OUT --RUN/IN --STOP on top of the button.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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