Show spark time indicator Is very useful device it la Is difficult to locate the exact point at which the contacts in the timer break and thereby cause the spark in the cylinder you can however wire an electric light bulb as shown to get an absolute indication of the fhe exact moment when the contact breaks one terminal of th the bulb Is 1 w wired alred directly to the battery and tho the 0 ther other to tile terminal of the coll coil that Is connected to the timer when the tha contacts are closed the bulb will light 10 COL when the timor timer contacts are closed the bulb lights when they break the light goes out when the contacts break the bulb will go out this method of 0 timing or checking the ignition system Is one which will be found helpful not only to the tha garage mechanic but to the motorist who works on Ms his own car in his spare time it does away with guesswork and because of its simplicity ot of operation saves considerable time on tho tha job popular science monthly |