Motor-car principles; the gasoline automobile (1910)
Whitman, Roger B. (Roger Bradbury), 1875-1942 · New York, London, D. Appleton and Co. · leaf 133
IGNITION 107 order to complete its circuit. The secondary current, as well as the primary, may make use of the metal of the engine as a ground return, and one of the points of the spark plug is there¬ fore in contact with the metal, being supported on a metal sleeve that is screwed into the cylin¬… … Fig. 29. — A , Spark plug; B, spark plug in section. ing the space between them. The insulation is secured by a tube of porcelain or mica set in the sleeve, the lower end of a metal rod that passes through it being the required distance from the wire or projection on the sleeve (Pig. 29). This…
Automobiles
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