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Show RECTIFIER NEEDED T() i CHARGE BATTOi By PAITj F. GODLEY, , II America- IXMVLUOat Radio Authority. Charge your own radio sot stor.if battery and save money To most amateurs this problem of caring for tho storage battery seems form formidable than it really ls. Common practice ha decreed the use of an alternating current supply for power and light purposes This typo of current is not continuous it flows In one direction, dies out. reverses re-verses Itself and then lows In th.-opposite th.-opposite dlrocti.n in the modern commercial system these reversals usually occur from 26 to GO times a second. I There Is no ready method whereVv th vacuum tube of the radio set mav depend directly upon the . om,urr, l ," I alternating current lighting system tor its supply 'lh. - hanger m burrent direction take place at a rate of Pei d which makeo an audible tone These effects are of such tntenelty n to completely drown out rVrn Ih,. strong incoming rarlj,, Blanals Eventually, suitable appliances w p be devised to make th, aitefnatlna current avallablu f, us, ;r, the tu'. detector But they haven t been de veioped yet ccn Ue" FIITERS. Vacuum tubes may be supplied now with some success .Wi lighting s-tems s-tems uslnsr "direct" or r.mn, ' rurr,-,,, Such ,v., ., rjTjSuW ALTERNATING CURRENT ' J LAMP -SOCKET T I 6TORAGE BATTE.RY DATTeRY CHAKGLR V I V I I 'fStorlnK1 Current for Vacuum Tube. used Injargevonridlng, hotola! and on board ship. curl.10 0V,'n th,S :O'"-C0 Of der tTiat Qtitf " "Wtn" m or-charJV or-charJV "y rMS'ftvm.B In Its liara, ter-any minuto ., i1ff, d or ,h""may Ot"a out be- J"ar with U.fl&ffS.wS the?. dpeprt on, th ..r nr1w , CC"J UTSket0nl:,, -latent user of th " Ul( ron- t, the devico will tubp "itself "it-self Ce wUl 90n pay f0r lt- current, a. i S Ll kcU t,4'n on thej to the battery Palr f "cn?' lTI'-e5 of battery' charfr JHI for home use range front Cntll more convenient mttaL vacuum tube eup'ply are pfrt5" tise of such rectifiers will PfM I economical. B |