From an electrical point of view, it makes absolutely no difference if the resistor is a separate device inside the coil, the primary coil winding itself (using small gauge wire) or a device separate from the coil. Coil energy will be exactly the same, assuming resistance and inductance are the same.
Obviously it's a lot cheaper to use the primary coil winding for the "internal resistor" rather than a discrete device. I assume the older coils such as in your illustration used a separate resistor to keep heat away from the coil windings.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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