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The distributor is separated into three sections: the upper, middle,
and lower. In the middle section, the corners of the spinning breaker
cam strike the breaker arm and separate the points some 160 miles an
hour. (standard ignition) High-voltage surges generated by the action
of the coil travel to the rotor that whirls inside a circle of
high-tension terminals in the distributor cap. At each terminal,
current is transferred to wires that lead to the spark plugs. Two
other devices - the vacuum advance and the centrifugal advance -
precisely coordinate the functions of the points and the rotor
assembly as the requirements of the engine vary.
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