Simple transformers (like an ignition coil) would have 4 leads (at least internally) ; 2 for the primary, 2 for the secondary. In a lot of transformers 1 lead of the primary is "common" with 1 lead on the secondary, which are both typically connected to ground, hence the modern 3 terminal coil. So, my current coil has 4 leads, a sparkplug type wire and a screw terminal going to the distributor, and a + and - on the primary side (screw terminal) which go to ground and the start switch, respectively.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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