Science: Eye in the Sky

In missile-age warfare, a military commander will have only minutes to launch his rockets before a target moves on—or attacks him first. Last week the Army Signal Corps announced an ingenious electronic device that will tell him whenever a target appears: the RP-71, a flying robot that can take off from a launching rig, spy on the enemy from altitudes up to 3,000 ft. at more than 200 m.p.h.

The prop-driven RP-71 radios back target data it picks up by radar or infra-red sensory equipment. Night targets are lighted by a series of 300,000-candle-power flares, recorded by a motion-picture camera. When its...

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