. Farm machinery and farm motors. FIG. 305—PRINCIPLE OF THE FLOAT-FEED CARBURETOR 4i8 FARM MOTORS the hot tube and the electric spark. The latter type, whichis most popular in America at present, may be dividedinto two classes, the contact spark and the jump spark (Fig. 306).—It has been noticed thatwhen a break is made in an electric circuit a spark takesplace, and it is upon this principle that the contact gaso-line ignitor depends. The charges of the fuel mixture. FIG. 306—CONTACT-SPARK IGNITOR FIG. 307—JUMP-SPARK IGNITOR

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