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Show DOOR BELL HELPS TO LEARN RADIO CODE I Y PAUIi F. GOPIifcl America's Foremost Radio Authority An oniinary door buzzer, or a door bell with the Konsr removed, may be connected with an antenna to act as telegraph transmitter Hooked un to a crystal reoeiver such a transmitter hus been known to operate satisfactorily over distance dis-tance uf three or four miles. The range covered will depend upon the power of the battery used. An Increasing number of persons who have become interested in 11s-tenlne 11s-tenlne to radio broadcasting are I picking up the code. It adds f uscl-natlon uscl-natlon to reception. It lets the oma- I DOOR BELL RADIO TRANSMITTER I teur listen In on the inside of radio. The Dleasure of beinir able to un- derstand th ! houands of till messages that are flashed fc tlnfnt to r ...iitinent from ?b!j more than com ii'-nsatfs ou trouble Hiid time expended I lng up tho code. The. avert required for m.isrerl'og 9 ranges between three u months. Bui. wlth'n a ery short U beginner ca n 1 1 a ch the .ad he '-.i n r i-l. up i;al of sU'iji are usual! v rcoea sevi nl I Having memorized the a BP' ed : n r ptlon fan lc 41 bv .i 1 1 1 1 ' pi a I j transmitter i Copj rlRht. 19::, 5trt |