Word: glowlamp
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Dates: during 1930-1939
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...liquid air, and sold to academic laboratories for $100 a litre if pure, $15 a litre if mixed. Argon or nitrogen at low pressure are the usual fillers for electric tamp bulbs manufactured in the U. S. In Europe, however, krypton-filled lamps have been manufactured by Philips Glowlamp Works of Holland and other companies for about three years. Krypton lamps cost 75?, compared to 25? for argon lamps, but their sponsors claim that a 40-watt krypton lamp sheds as much light as an ordinary 50-watt bulb and that the cooling effect of krypton remarkably prolongs the bulb...
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