Trembler coil
Part of early car ignition systems / From Wikipedia, the free encyclopedia
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A trembler coil, buzz coil or vibrator coil is a type of high-voltage ignition coil used in the ignition system of early automobiles, most notably the Benz Patent-Motorwagen and the Ford Model T.[2] Its distinguishing feature is a vibrating magnetically-activated contact called a trembler or interrupter,[3] [1] which breaks the primary current, generating multiple sparks during each cylinder's power stroke. Trembler coils were first used on the 1886 Benz automobile, and were used on the Model T until 1927.[4]