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Show I HOW YOU CAN BAR STATIC IS TOLD BY EXPERT I j Devices Designed to Cut Down Interference Hamper Set By R. L DUNCAN. Director, Rdlo liustltiitr of Amrrlrvn All device BO tar put forth to eliminate elim-inate static interference also cut dOWH the signs! strength of the radio H N iTlon. But a balanced crystal set constructed con-structed hy the English Marconi i om-H om-H I'any operate with fair success. It consists of two oarboruridum de-H de-H tecton energized by a local battery current. One detector Is adjusted to a hlnh degree of sensitiveness and the other to r lesser degree. When heavy ehargo of static enters en-ters the aerial, the crashing sounds I are somewhat eliminated by tho re- action process of the crystal rectifiers. i Hut the Incoming signals are likewise I wpii Uenod. I In tropical countries, where one' Ordinarily ."an receive transmission i from n station oOO miles away, it 1 ! if time? impossible to recolve VCfl 10 tiillis on account of static In-teference In-teference To reduce static inlerference to n minimum most transmitting apparatus appara-tus today employ a BOO or 800-cyclc note-on having a high-pitched ) I musical sound static comes t" on a very low pilch. j A good way to CU( low n on static I interference Is to employ the eat possible degree of coupling between j th primary and secondary windings j of tho receiving tuner to tho lowest I point where the signals you wish to copy are still nudlble. t i ),.,, t forgM i to " that there Is a good lightning switch on tho aerial connection leading Into the house. N'r.t only Is this nsoeSSary tO comply com-ply with the rule of the fire under- I writers-, but It Is a great protection . : for the house, making the aerial I ground eel i i lightning rod w |