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Show AN EFFICIENT S-WATT TRANSMITTER for those who wish a more powerful power-ful ami efficient set for sending this is 1(1 be highly recommended. Under Isvorahle conditions it should have a M?e of from 25 to 40 miles. More-Cll More-Cll It Is not an expensive set to make H exclusive of batteries, should not tl,sl over $35.00 to $45.00. The sram as given in Fig. 00, makes wiring very plain, A being the '"lal, It the ground, C the ammeter. Inductance, E the variable eon-7r eon-7r F the fixed condenser, G the M-loak. U the modulation transfnrm-K transfnrm-K the grid, L the plate, M the 'wiiU. N the choke-coil, O the reetl- p the current transformer. Aldiou-h practically every part of 's't can De ma(e with t(? (x. I1 .on of the ammeter, rheostat. ;"cr"Plinne. nnd modulation trans-' 'lir foil, still it is almost as cheap '; "ai'.ii nmre satisfactory to pur-j' pur-j' the current transformer, the . "'Me condenser and the choke-coil. inductance D is easily made, the . e -"il being wound with No. IS Insulated wire on a cardboard '' '"I'oe and one-half inches in di ' "SM,R twenty-six turns anil is ,;;.,j''!J "I the thirteenth turn. T''e '.''.';"" is the same size of wire. J," (liSht turns. The space ,' '''" windings or turns should be ! ""e-balf inch. The choke-coil "I'iiri'0 ",lrcll"s,'u' IIS such, but an srv 'K!y S1"l,'k coil using the spwnil- ,'nl llng-tiniy he used and an old vrf OH with contact-breaker: "Jh m,J' he usi'd for Ihp ' ter transformer. The am- i :.; 5r"SL'1 should he one of low read- ! vu',e or- 'f desired, an ordlnarv ! 'f''t bull, may be us.nl in-''1( in-''1( f'lr h anime,er- however, will ;i better results. The grid-tea it ;Hura ,ary len'' lien''il lpr'1; "' ;"'t t , U'ad- The ,n"st 'lilhcult ! lit K(1lml;t! ls Hie current reclilier. I mnn 11,18 18 verv simple and i tilied",erely "f eigllt ',int fn,it I t"r-Js ( VMUl a solution of ordinary ; Imi,l of h"'e Proportion of half a I ' lilii,,. "ras t0 1'lnts of water. ; , ik?. e jRI's avoid having any i I '-tern, a! h "rus or sediment in Imi, tl'a 011 only about three-fourthn j 6 Plates cousisl ui alteniale lead aim aluminum strips, eight of each alternating as shown in Fig. 01. and w'irh each plate 5 x i inches. With this rectifier and the current riansfurmer I', an ordinary 110 volt. 00 cycle ele"tric current may lie used, or without these, two or three IVhat-tories IVhat-tories may be used instead, but this is far more expensive and does not give as good results. Before usinff this outfit t lie rectifier must be treated to form the plates, which is accomplished accom-plished by connecting an ordinary 5(1 watt incandescent bulb and letting, the 110 volt current run through it for ten or twelve hours. Another point to remember is always al-ways to disconnect the high voltage current from the plate when not in use and when using the set always light the filament in the tube with the lou voltage battery before turning on the I igh voltage current. The switch oil the microphone circuit also should alunvs be thrown off thus dis-'on j t ting the phone fro- the batrev when not In use. 1 tune tins set it is onlv necessary to ad.ius! (he variable condenser until the amm.Mel -. ilashlight slows the highest read ing. |