. Farm machinery and farm motors. FIG. 306—CONTACT-SPARK IGNITOR FIG. 307—JUMP-SPARK IGNITOR. FIG. 308—WIRING SYSTEM FOR JUMP-SPARK IGNITION are ignited by causingthis break to be madeinside of the quicker this breakis made, the more pro-nounced theSpark. Thespark is always madelarger and more pro-nounced by including inthe circuit a spark spark.—Thejump-spark ignitor(Fig. 307) has withinthe cylinder two pointsinsulated from eachother and separated by GAS, OIL ANn ALCOHOL EXGINES 419 a very short distance. It dififers from the contact-sparkcircuit in that there must be a
. Farm machinery and farm motors. FIG. 306—CONTACT-SPARK IGNITOR FIG. 307—JUMP-SPARK IGNITOR. FIG. 308—WIRING SYSTEM FOR JUMP-SPARK IGNITION are ignited by causingthis break to be madeinside of the quicker this breakis made, the more pro-nounced theSpark. Thespark is always madelarger and more pro-nounced by including inthe circuit a spark spark.—Thejump-spark ignitor(Fig. 307) has withinthe cylinder two pointsinsulated from eachother and separated by GAS, OIL ANn ALCOHOL EXGINES 419 a very short distance. It dififers from the contact-sparkcircuit in that there must be an induction coil. Thiscoil requires a primary current leading to it from thebatteries, and a secondary current leading to the sparkpoints. This latter current has the characteristic ofjumping from one point to the other in the form of aspark, thus igniting the charge in the engine (Fig. 308).562. Batteries.—In the majority of cases the currentsfor electric ignitors are furnished by batteries composedof either dry or wet cells. It is very difficult to determinewithout the aid of prop
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