Biggest Bulb

The largest electric light bulb ever made--22 in. high and 15 in. in diameter--side by side with the smallest, no larger than a grain of rice, was exhibited at the Sprague plant of the General Electric Company, East Orange, N. J. The monster bulb is of 150,000 candlepower and requires four large cables to supply the 30,000 watts it burns. Four long strips of heavily corrugated tungsten steel were used as filaments. The heat generated reached 3,200 degrees Centigrade, melting the glass. A large electric fan was used to cool the air. The inventor, George Bowerman, is experimenting with a type of quartz glass to withstand the heat. Red rays are absent from the spectrum of the big bulb, which closely resembles that of sunlight. The lamp will be used in moving picture studios and color photography. The minute sister bulb was the one used recently by Dr. Chevalier Jack- son, distinguished Philadelphia surgeon, to illuminate the throat of an 8-months-old baby from which he extracted a tack.