National Geographic : 1930 Nov
• THE SECOND OF A SERIES OF ADVERTISEMENTS DEALING WITH ULTRA-VIOLET RADIATION IN THE HOME )" What may we expect of ULTRA-V SCIENCE has analyzed the sun and found that, besides light and heat, it gives off tiny invisible waves (70,000 to the inch), known as Ultra-Violet rays, which have a profound effect upon all manner of life. Just as our eyes are receiving sets tuned to the mighty broadcasting of light given off by the sun, so our skin is tuned to the invisible health waves sent out by the same source. Though they penetrate the skin no deeper than the thickness of this sheet of paper, these rays are able to work deep changes throughout the entire body. Vitamin D-the sunshine vitamin-is produced only under its influence. This vitamin is an aid in the depositing of calcium and phosphorus and other min erals in the bones. These vital rays stir up many of us mentally. They help to build up resistance (TYPE S-I) LAMP This lamp contains (a) a to disease. They tan our v" shaped tungstenfila ment (b) two tungsten skins (though it is not ectrodes (c) a pool of free mercury and (d) a necessary to tan to receive bulb of special lass. the benefits of ultra-violet tu ed thefiarent is radiation). Theymmediately heated toin radiation). They are a candescence. A portion powerful aid in the main f the mercury then va powerful aid in the main- porizes and an are (e) tenance of health. forms between the two electrodes. (See cut). But Ultra-Violet, arti ficially produced in the home, should not be regarded as a "medicine." It should be regarded in the same light as fresh air, pure water and wholesome food. And like all of these essentials of health it should be used with moderation. Like all great discoveries, Ultra-Violet radiation has been the subject of much misconception and misunderstanding on the part of the public. Its curative powers, in general use, have been exaggerated, in some cases by commercial ex ploiters. Ultra-Violet radiation is not a "cure-all." It is not a substitute for the services of a physician in the case of illness or disease. In all cases where Ultra-Violet radiation is indicated as a treatment of disease, the attending physician should prescribe and supervise the treatment. For many years, as the world's largest manufacturer of things electrical, the General Electric Company has sought, in its vast laboratories, a means of making the known, 'IOLET Radiation? health-maintaining qualities of Ultra-Violet available to the general public. The result is the General Electric Sunlight (Type S-i) lamp. To be worthy of a place in the long line of General Electric products, this lamp had to be efficient. It is. It is not merely a "heat" lamp. At a distance of three feet, from a standard utilizing the G. E . Sunlight (Type S-i) lamp, the public may expect the same ultra-violet effectiveness as is found in mid-day, midsummer sunlight. To be aG.E.productithad tobesafe. It is.Thebulbof the G. E . Sunlight (Type S-I) lamp is made of special glass which filters out nearly all radiation not found in the best natural sunshine. In any standard or fixture using the G. E . Sunlight (Type S-I) lamp (the lamp cannot be used in the ordinary lamp socket) the public may expect radiation which embodies the simplicity and economy of the mod ern MAZDA lamp with an adequate supply of safe ultra violet. They may expect to use such equipment freely-for irradiating the children as they play or dress-as a reading lamp beside their easy chairs--as a lamp to stretch out and relax under as it stands by the couch or bed-as a wonderful sew ing light-as a means ofob taining "sunlight" in the bathroom while shaving these and in many other ways. Just as the vacuum tube is the heart of radio, so the G. E. Sunlight (Type S-I) lamp is the heart of modern man-made sunlight. Every one who expects to obtain thefull benefits of ultra-violet radiation this winter should insist that the sun lamp they buy uses the G. E. Sunlight (Type S-I) lamp as its source of energy. It is sold in accordance with the require ments of the Council of Physical Therapy of the American Medical Association and is backed by the greatest name in electricity. The Incandescent Lamp Department of General Electric Company Nela Park, Cleveland, Ohio GENERAL ELECTRIC SUNLIGHT (TYPE S-i) LAMP loin us in the GeneralElectric Program,broadcast every Saturday evening on a Nation-wide N. B. C. Network.