Word: detectable
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...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...
Many of the paintings looked as though they had faded in the sun; the colors were so faint that it required close examination to detect where a pink ended and a blue began. Another unusual feature of Gwen John's painting was the number of studies she made of her subjects from the rear. She sketched a good deal in church, using women at prayer for models...
...problem of landing on the moon without smashing the radio to smithereens. Parachutes would not help, for the moon has little or no atmosphere. Dr. Hutcheson's solution: a tiny radio in the nose of the rocket. Working like the proximity fuses in antiaircraft shells, it would detect the approach of the moon's surface and fire "braking rockets" at the proper distance. Shooting their power forward, they would counteract the moon's gravitational pull (one-sixth as strong as the earth's), and allow the whole apparatus to make a sufficiently gentle landing...
...Reader Loewenbaum's sharp eyes failed to detect the faint signature, "C. Glinzer, 1867." The painting is a copy of Rembrandt's The Architect, and Copyist Glinzer chose to call it Archimedes (who was no mean architect...
...fire alarms are set off by a fire's heat ; by then the fire is usually blazing merrily. A Socony-Vacuum physicist named Paul B. Weisz thought he could do better. Last week, in Electronics magazine, he announced an ingenious ray-catching tube so sensitive that it can detect a match flame at 60 feet in broad daylight. The basic idea of Weisz's gadget is the detection of minute quantities of ultra violet radiation. In the earth's absorbent atmosphere most natural and electric light rays, except clear sunlight, contain almost no radiation...