Science: Poor Man's Radar

An airport's instrument-landing radar is a gadget-lover's dream. Outside, it blossoms with dials, scopes and switches, and its insides are stuffed with wires and vacuum tubes that look like spaghetti sprinkled with caviar. It is such an expensive gadget that only big airports can get it. Last week Britain's Ekco Co. was telling about its "poor man's radar," designed for the pocketbook of the small-field manager.

Four years ago Manager Bernard Collins, of Britain's Southend Airport near the mouth of the Thames, was having a drink with Tony Martin, chief radar engineer of...

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