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Show ' VAGRANT ''SIGNALS PUZZLE RADIO MEN LONDON'. Dec. SI. Despite tho most diligent reaoarcli, cxporU aro not yet bin to aey whence the mysterious "vagrant" ilgnul9 como that every day. and particularly at night, aro received on wireless aeriuls. "From the earliest days of lor.x-dlstnncc lor.x-dlstnncc Wlreleea telegraphy, the dlf-fli-ultles In reception duo to vasraht or natural rlertrlc waves and atmospheric atmo-spheric elcctrlr- discharges passing down tho receiving aerial havo been tho bane of thr- wlrelecs telegraphist." telegraph-ist." l'rofessor John Aiiibrojn- Klem-mg) Klem-mg) of London u:ilf:r..l told Ihe Royal Society of Arts. He aald Elavil g n rard to the. fact that th positive atmospheric elect.rkal grad- B lent oi the earth lncn-uot at lh rat1- Hl ot about Inn volts per meter of ascent 1 roughly speaking. It Is not surprlwiniT HH tnat atrlala aevaral hundred leet high B in- traversed by quite larg cur- H1 renta due to this cause ulone which 1 may uttorlj iwamp the feeblo signal !, i feaaor ETlemlng is the lnvento. I of the thermionic valvo-recolver BA which revoluthnlzod wirele&s teleg- B raphy and telephony. Kl |