The pull in winding is to ground and supplied from the Arm post. This keeps on keeping on for the duration. (other wise it would not pull in at the beginning) The arm voltage increases with RPM as the magnetism increases (due to the field windings tapping into the near open armature voltage, the field force almost is equal to full running current) the only thing "attached" to the arm is the pull in winding. Gotta Love it. Oldtyme Electrical compromise. Jim
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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