Posted by jdemaris on December 27, 2007 at 12:59:59 from (67.142.130.48):
In Reply to: Another Coil question posted by John T on December 27, 2007 at 07:33:14:
This is not directly relevant to what you posted, but still falls under the heading of "interesting coil trivia."
I was just looking through a 1930s Delco ignition parts and systems catalog. One interesting item is the "three terminal" coil they list. It was used along with a polarity-changing switch. Polarity would be manual changed once in while to change the direction of metal transfer on the ignition points.
Also shown is: 1. Round type with straw-colored shell. This coil does NOT incorporate an internal resistance unit or a condensor.
2.Round type with black-shell. This coil does not incorporate the condenser but does have a resistance unit on the outside of the coil-shell.
3. D-type with Bakelite shell. Carries the resistance unit carried upon the end of the shell, but does not incorporate the condensor.
4. D-type with black shell. This type incorporates the condensor within the shell and the resistance unit towards the end of the shell.
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