"Do you think it would be safe to conclude that the proper sized ballast can be determined with an ammeter, instead of measuring it's resistance, 4 amps when it's powered up? "
I don't have a problem with the use of a good analog ammeter myself. An "ideal" (none such made however) has zero resistance so as to NOT affect the reading. The critical limiting factor (to prevent premature points failure) in a typical old tractor coil ignition is how much current the points can pass and switch so if you get that in the 4 amp range and provided 4 amps is a sufficient coil current I say compute the ballast resistance by that method makes sense. That's where they get the typical 3 ohms vicinity for 12 volt coils and 1.5 for 6 volt coils as that yields the 4 amps of points current. NOTE these are not all exact figures, I've seen stock 12 volt coils from 2.5 to 3.5 ohms.
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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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