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Condensers are just capacitors that can manage the medium voltage back flow that happens in the inductor coil when it's generating a high voltage spark during the magnetic field collapse. They have to be able to take at least 250 volts of back flow voltage without leaking it. They are measured in capacitive reactance just like any other capacitor. On later Fords that went 12-volt, they just used a ballast resistor to control the current flow and voltage since they had the same basic coil, points, and condenser.