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Show - ! SPARK PLUG EQUIPMENT. M Spark plugs are a source of much H obscure ignition (rouble that car own J era have great difficulty In locating, in H man cases the Insulating material HH iis-ii in ihe construction of thejdug Is n Fg porous, permit, line electric leakage fiil through iiu porcelain and also allow 4i3 Ing absorption oi the carbon found jH with each explosion, until finallv the insulation changes its properties en lirclj In BUCh cases the car owner. J having cleaned bis plugs and flndinu 'the trouble still cxisteni. assigns its source to some other part of the sys- , I owner is recomuieutied to consult the. H service station of a spark plug manu- H facturer and gel a plus equipmeiu i w hich i .perially adapn d lo his ce.r. H |