OCR Text |
Show Electricity in Signaling The newest use of electric lamps Is BOCTet slgnnllng for riillitary purposes. By properly screening signal lamps with certain materials only the Infrared Infra-red rays, which are Invisible to the naked eye, are released. These are received re-ceived at various distances by sensitive sensi-tive apparatus which will sound bur.-zert bur.-zert and otherwise respond to the rays even though nobody In that region except ex-cept the operators Is conscious of the fact that the peculiar light Is being transmitted. |