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Nick,
The T and the A use different ways to generate the ignition voltage.
The model T uses a coil/interupter that generates high voltage when it gets 6 volts. The timer switches 6 volts to the different "buzzboxes" for each cylinder.
The Model A uses a set of points that open and close instead of the vibrating interupter. The distributor then switches the high voltage to the different cylinders. The Model A has one coil for all cylinders. The model T has a coil for each cylinder.
Two very different methods...in essence a low voltage switching vs a high voltage switching.
By the way, Atwater Kent invented the points/coil system. Later, he went on to start a radio company.
Marc