When people see an advertising sign in which the letters or designs are formed by slender glowing glass tubes, they may know at once that it is a neon light sign. Although effective as displays, these lights are expensive because of the high voltages necessary to start them glowing. Last week Raymond R. Machlett, 30, Manhattan electrical engineer who, when he was 26, was one of the first to develop a commercially satisfactory Neon tube, announced that by altering the construction slightly, he had been able to light a neon lamp with a 220-volt...
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