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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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