American cinematographer (Jan-Dec 1926)

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Eighl AMERICAN CINEM ATOGR APHER March, 1926 "Black Light" Bij Herbert S. Marshurz, A. BM D. Opt. "Invisible" Light Brings Interesting Speculation in Scientific World rHE old say in y "there is nothing new under the sun" is sometimes contradicted. To state that white lamp black has been invented might inspire you to laugh or tap your forehead significantly. We can say, however, that "black light" has been discovered and you should not laugh because it is scientifically true. Black light! Sounds just as ridiculous as bration at some 150 quintillion times a second, white lamp black. According to calculations in "The Forum" At first thought, one might conclude that the pendulum of a clock would have to swing black light must be the light in a totally dark for over a billion years to make as many back room. Thinking about such a problem is a and forth motions as the gamma ray does in a good deal like trying to determine whether single second. there really is sound or not, when a book falls on the floor in a room where no one is within ear-shot. Mixture of Colors But black light has nothing to do with light in a dark room. All light — sun light and artificial light — being a mixture of all Scientific Attention Invisible light, unknown and then considered of minor importance for decades, is now holding the center of the world's scientific stage. Employment of ultra-violet and infrared rays for invisible long distance signalling has been reported. The highly exploited but colors, the more thoroughly and correctly the still mysterious "death rays" — intended to colors are mixed according to nature's formu destroy an aeroplane in midair, etc., depend lae, the whiter the light. upon "black light." Still more recent honors Rainbow Effect have come to invisible light, with the an Now if white light is broken up into its rjouncement of unusually successful celestial component colors by means of such a simple photographs employing infra-red rays. Per device as a prism, or a very complicated deli haps the real story of life on the planets will cate instrument such as a spectroscope, the rainbow effect obtained is the spectrum. The rainbow is of course nothing more than the light of the sun broken up into the various colors that make it white — the familiar redyellow-green-blue-violet, each color with a different rate of vibration speed . Light Invisible to Eye These Colors are all that the eye can see be revealed when black light is sufficiently understood and controlled to provide detail photography over millions of miles. Smith and Aller to Handle Dupont-Pathe Film on Coast Distribution of a new brand of motion picture film in Hollywood and on the Pacific With instruments, however, light that the eye coast was announced during the past month. cannot see can be measured and photographed. This light is both at the red end and at the violet extremity of the spectrum. We have known of this invisible light and have called it infra-red and ultra-violet, respectively. But because it cannot be seen, has no quality of illumination or color, British scientists have appropriately called it "black light." Vibrations Dupont-Pathe is the new film product; it will be distributed by Smith and Aller, Inc., as Pacific Coast distributors for the DupontPathe Film Manufacturing Company. The principals of the new film distribution firm are J. Wesley Smith and Simeon Aller, both of whom are well known in cinematographic and laboratory circles on the Pacific coast. Prior to announcing the formation of his firm to handle the film, Smith made a trip to The characteristics .of black light are as New York City and the East where he conwell known as our old friends infra-red and ferred with factory officials on the product ultra-violet. The former has a lower vibration rate than its neighbor, red, and the latter vibrates at a higher rate than violet, but not as high as the X-ray. Still faster than even the X-ray are the gamma rays of radium, vi which is being produced and marketed under the famous Dupont insignia. Smith and Aller, Inc., are establishing headquarters at 1(K6 North Cahuenga Avenue, Hollvwnod.