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The RCA Radio Altimeter assures that the last mountains have been passed before letting down to the airport in the valley below. Measuring "every bump on the landscape" -at 20,000 Feet! A radio altimeter —that indicates the exact height above land or sea —is another RCA contribution to aviation. Old-style altimeters gave only the ap- proximate height above sea level—did not warn of unexpected "ofF-course" mountains. To perfect a better altimeter was one of science's most battling problems. So RCA developed an instrument so accurate it "measures every bump on the landscape" from the highest possible altitudes... so sen- sitive it can measure the height of a house at .500 feet! This altimeter —actually a form of radar — directs radio waves from the airplane to earth and back again . . . tells the pilot ex- actly how far he is from the ground... warns of dangerously close clearance . . ."sees" through heaviest fog or snov\'. A// the radio altimeters used in Army, Navy and British aircraft were designed and first produced by RCA. This same pio- neering research goes into everij RCA prod- uct. So when you buy an RCA Victor radio, N'ictrola, television receiver, even a radio tube replacement, you enjoy a unique pride of ownership. For you know it is one of the finest instruments of its kind that science has vet achieved. Radio Corporation of America, Radio City, New York 20. Listen to The RCA Show. Stindm/. 4:30 P. M.. E. T., over NRC. The RCA radio altimeter %\ill be a major coiitrilnirtdn to tin- safety of po.st-war (.(ininu'rcial fKiiig. Tlie section at the left sends tlie radio wa\es to earth and hack again while the "box" at the rii;ht —tim- ing tliese waxes to the millionth of a second —tells the navigator the plane's exact lieight in feet. RADIO CORPORATION of AMERICA