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 - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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