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What has silk to do with
LAMP BULBS?
The camera tells General Electric's scientists how silk'controls light
SILK, as cinematographers well know, is the most commonly used material for spreading the light to soften shadows, and for diffusing light to eliminate "hot spots". It helps you control light quality and intensity. It transmits from 65 to 75% of the light and effectively conceals the bright filament. The photo above shows how it distributes the light. Very similar characteristics are shown byground glass and pebbled glass.
In white opal glass, as the companion photograph indicates, much better diffusion is secured but light transmission is reduced. This material transmits about 50% of the light directed at it.
Directly, these facts about translucent materials bear little relation to lamp making. But
White opal glass diffuses more but transmits less light
New bi-post 2,000-watt G-tS. Used in 18"sun spots and studio condenser spot lamps. Also available in 1 ,000-watt size.
they play a very important part in light control, a fundamental of illumination in cinematography as in home, factory or office. Hence G-E engineers and scientists study the characteristics of all translucent materials.
Thus by being able to understand your language, we may be able to serve you better — in designing new lamps and in assisting you to benefit fully from the many types of General Electric Mazda lamps available. General Electric Company, Nela Park, Cleveland, Ohio.
General Electric manufactures lamps for home lighting and decoration, automobiles, flashlights, photography, stores, offices, and factories, street lighting and signs . . . also Sunlight lamps.
General Electric invites you to visit its exhibit in the Electrical Building at the Century of Progress
GENERAL A ELECTRIC
MAZDA LAMPS