Word: reflector
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...other gadget: sonar, radar's supersonic cousin. A sonar-equipped locomotive, by means of an oscillator and amplifier, would keep sending out whistle blasts pitched so high that nobody could hear them; but if a signal box ahead had its danger arm up, a reflector would send back the sound waves to the locomotive. There a microphone would detect the supersonic racket, a bell would ring (or a light flash), and the engineer would throttle down to his foggy-foggy...
...TIME, Sept. 2] that the trade secret of the fact that Barnaby was ghostwritten had been let out of the bag last week. However, in an article for my junior high-school paper I mentioned that Mr. Johnson had stopped working on the Barnaby strip. This issue of The Reflector came out last June...
...Friend observatory is as practical as any backyard astronomer could wish. The supporting base is a perpendicular concrete column, 16 feet long, anchored in bedrock eight feet below the surface on the highest hill of the orange grove. To this block is bolted the large telescope - a 16-in. reflector in a 12-ft. galvanized iron tube. On the lower side are ascension and declination meters and counterbalance weights. The observatory is roofless. A square wooden platform provides working space. The lenses were ground in a small Escondido garage-workshop...
...other major jamming method, "Window", involves the seemingly simple procedure of dropping huge quantities of light aluminum foil from planes on bombing missions. It was discovered the small strips of aluminum, which is an excellent radio reflector, would, if cut to one half a radar's wavelength, send back a disproportionately strong echo...
Radar's ability to report what it sees depends on differences in its targets' reflecting power (which engineers call the "dielectric constant"). Metal is an excellent reflector; earth, an indifferent one. Water also is a good reflector, but because of its flat surface, the radar beam caroms off at an angle and no echo reaches the receiver (except from a spot in the center of the beam); hence water appears black on the scope...