Perhaps it should be pointed out at this point that when using the primary timing capacitor the wave-form will have one additional characteristic not illustrated. There will occur at the make point on each half of the cycle a fine line peak rising a short distance above the horizontal top of the wave. This is caused by the in-rush of charging current into the primary capacitor upon the closing of the contacts. Should the damping resistor be used in series with this capacitor, these peaks would be reduced, or eliminated. However, since the purpose of the primary section is to eliminate the starting arc, the small amount of contact deterioration caused by the absence of the resistor is justified in order to accomplish this purpose.

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