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 - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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