Handy man's workshop and laboratory . er is better. THE HANDY MANS SPARK PLUG The spark plug shown here is equally well adapted for highor low tension ignition. It may be made by any handy workmanfrom an old mica plug by taking out the steelwire down the center and putting in its place apiece of brass tubing, 3/16 of an inch outsidediameter and % of an inch inside diameter. Aand B are the terminals forming the sparkgap, C is the mica, and D the threaded body ofthe plug. The upper end of the terminal Ais riveted to a small valve E, which is presseddown by a weak spring and thereby closes theupp
Handy man's workshop and laboratory . er is better. THE HANDY MANS SPARK PLUG The spark plug shown here is equally well adapted for highor low tension ignition. It may be made by any handy workmanfrom an old mica plug by taking out the steelwire down the center and putting in its place apiece of brass tubing, 3/16 of an inch outsidediameter and % of an inch inside diameter. Aand B are the terminals forming the sparkgap, C is the mica, and D the threaded body ofthe plug. The upper end of the terminal Ais riveted to a small valve E, which is presseddown by a weak spring and thereby closes theupper end of the tube, as shown in the valve chamber is screwed on the upper endof the tube, thus holding the mica valve operates in the chamber, beingfastened thereon by the screw F. The valveand its seat should be ground flat, and then theterminal A should be riveted to it. There isa small hole G in the cover of the air cover should be fastened to the chamberwith a screw or other simple means, so that. Fig. 324—Sectional view of the spark plug 388 HANDY MANS WORKSHOP AND LABORATORY It may easily be detached for the purpose of cleaning the valve. Inuse the terminal A vibrates rapidly, like the trembler of a coil,and in this way strikes the terminal B. During the compressionstroke the compressed gases travel up the central tube, lift thesmall valves, and instantly fill the valve chamber to the same pres-sure as the cylinder. With the same pressure on both sides of thevalve, it will be forced down by its spring. But as the gases in thechamber C escape through the hole G, the pressures will be thrownout of balance, and the valve will again be raised by the pressure inthe cylinder. This action will continue during the entire compres-sion stroke. The hole G should be extremely small, and the amountof gas that will escape during compression will not perceptiblylessen the power of the engine. It will be clear that as the valveis raised, A approaches B
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