Infrared Westinghouse Related to 1944 Henlopen Test
fields. the state, was and 1 in agree- a the manufacturers to give us better a car," Talking Lamps' Used During War Kept Conversation Mum BLOOMFIELD, N. J., Ovt, 10 The war-time development of a "talking lamp" which made possible secret two-way conversation over an invisible infra-red beam was dis- GIRL WITH "WINGS" .Jean Porter, star of "Betty Co- Ed," is working toward a pilot's license. Having completed ground closed today by the Westinghouse i school, Jean is now ready to lamp division. . . her first solo flight. The device, which made possible secret communications among ship convoys and airplane formations, was designed by Dr. Norman -0., . -- -TM--Â«.Â» .v,n, Beese, Westinghouse research en- ^i ta Hayworth and Larry Parks in gineer, at the request of the Navy and Air- Forces, the Westinghouse announcement said. The lamp uses caesium vapor, a metal which is rated an'efficient generator of' infra-red and is also a poor visible illuminant, the an- nouncement indicated. Range of the device is limited to the distance to the horizon. Dr. Beese said the infra-red beam- casting was similar to radio broad- casting except that the sound is car- ried over ultra-short wave lengths rather than long wave lengths, the waves are transmitted over a car- rier -wave having a frequency 350 million times the normal broadcast band. . The lamp itself serves as ._ the transmitter. Mounted on a ship's mast in a parabolic searchlight-like I reflector, it picks up words spoken into a microphone at the pilothouse or on deck and carries them to a re- ceiving station on another, ship or on shore. On the receiving end, a photo- electric cell mounted in. another parabolic reflector picks up the In- fra-red rays, and with suitable amplification converts them-into a reproduction of the spoken words. The key to such broadcasting, Dr. Beese said, is the ability of the-lamp, to alternately dim and brighten thousands of times a second in order to truly reproduce by wave lengths the varying tonal qualities of the human voice. The lamp will have -a peacetime- use, the announcement said, for communications when cosmic dis- turbances or disasters curtail radio and'telephone facilities. EED BEAM) Marc 'Kate, who co-stars withi Jta Hayworth and LarTM f*r\ Â· Â· Â· 'Down to Earth," has , an 11-day growth of beard for special scenes of the Technicolor picture. His beard is red. DA No. 1, P O 10 Lbs..