system, whereby the trembler interrupted the current through the coil and caused a rapid series of sparks during each firing. The trembler coil would be energized at an appropriate point in the engine cycle. In the Model T, the four-cylinder engine had a trembler coil for each cylinder.

Distributor-based systems

An improved ignition system was invented by Charles Kettering at Delco in the United States and introduced in Cadillac's 1912 cars. The Kettering ignition system consisted

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