The international photographer (Jan-Dec 1934)

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WHY GENERAL ELECTRIC DEVELOPED THIS NEW STYLE HIGH WATTAGE LAMP WHEN the electricians shift lighting equipment from place to place on the set, the lamp in each reflector is inevitably shaken and jarred. This snaps the filament about as if it had been struck with a mallet ... or were the end man in crack-the-whip. What takes the shock of these blows? Suppose we follow on the diagram, the complex path they travel through the supports of one of the old type 5 KW lamps. Down multi-metal supports into a brittle glass stem, up through basing cement and then down to the prongs . . . with leverage and weakness increasing all the way. At any one of eight points, a break may occur, bringing premature lamp failure. The movies brought a tough life to this lamp — tougher than any previously known. But G-E scientists, alert to motion picture requirements, began work on a lamp that could live it. They tried stems of different kinds of glass. They tried other experiments. The lamps were improved, but not enough. Gradually these experimenters reached one conclusion : great improvement would result only from the elimination of the glass stem ... a part of lamp making since the days of Edison. To accomplish this they turned to the method of fusing copper and glass developed in making a 50 KW lamp for Light's Golden Jubilee. But a year and a half of intensive experiment and test, without a single let-up, went by before G-E made this new 5 KW lamp available to you. In this new type construction, as the diagram shows, the channeled nickel filament support takes almost a straight line from filament to prongs. Stronger, more rugged, more accurate and better adapted to studio needs, this new lamp has been rapidly adopted by studio after studio. Improving existing types of lamps constitutes only part of G-E research. Other groups of scientists and engineers are steadily developing new lamps for new requirements. Still other groups constantly test and check a definite proportion of factory production on all types of lamps. Such work breeds confidence. Little wonder that studios from coast to coast use G-E Mazda lamps for all their lighting needs. General Electric Company, Nela Park, Cleveland, Ohio. OLD TYPE 5 KW LAMP NEW TYPE 5 KW LAMP GENERAL fP ELECTRIC MAZDA LAMPS