Show NEW RADIO FILTER A MARVEL campbell DI D I that BI marm tt to phen ph and ad TIIt raph cassag although much team baa been fid and ad written about the Q remarkable moser kable employed by the telephone lines and by advanced all radio n orbera borker tor far the of telephone and telegraph my aay tile the scientific amet CUB can it remained mainland tor far dr frank B J jewel tt chief engineer of the atea c era am electric company to demonstrate how bow the filter bermita of transmitting radio telephone and it telegraph mrs anks ages lIy and oil of ratIng these messages mess inges at the receiving end at a meeting of the american abbu tute tat of electrical engineers the tb present electrical filter Is the invention of dr 0 A campbell Coro a telephone h one t engineer and ad hakea k it pre poa C ible his to separate ep arote the various else cle kt at which the individual telephone and ad telegraph at go me are cur car and the detected electrical current cur verat in a radio tile receiving bet W 1 pawed passed through it ui filter which the of it the telegraph at emaLe fee than of the telephone biplane the filter differ diff lice materially from the ordinary turned tuned circuit familiar to tile the radio ma m enthusiast ince an it ep arate not at single ingle but bonds band ot of fro fre q cl ot at any pred predetermined lead width the al filter ter abkes it to nep kep rate to the bond band of frequencies corn cam drisin g the telephone melange from the band comprising the rho telegraph kiei me moge age it can elm also florate one tele adama aree mg fr from another |