Gadgets: Burble & Squeak

Ever since highway patrolmen started using radar to trap speedsters shortly after World War II, U.S. motorists have been searching for ways to beat the electronic rap. With misguided ingenuity, hot-rodders packed hub caps with uranium ore or loaded them with steel balls; they sprayed the fan blades with aluminum paint, dangled static chains from rear bumpers, festooned their radio aerials with strips of aluminum foil. But nothing seemed to foil highway radar, and latter-day Barney Oldfields continued to be hauled in like herring in a net, whining "Unfair!"

Then came "Radar Sentry," a device designed to give early warning...

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