National Geographic : 1930 Oct
THE FIRST OF A SERIES OF ADVER TISEMENTS DEALING WITH ULTRA VIOLET RADIATION IN THE HOME. ... this thing called ULTRA-VIOLET Z WILHELM HITTER N 1801 JOHANN WILHELM RITTER, a German phys * icist, made a most inter esting discovery. While exploring the theories of Sir Isaac Newton and others-that light was a series of waves (similar to waves upon the water) in the ether, and that color was caused by a difference S in the lengths of these waves- Ritter found waves even shorter than the visible violet. Invisi ble waves so short that it would take 70,000 of them to make an inch. And thus he laid the foundation for the mighty develop ment which scientific research has since weaned from the rainbow-hued sun in the interests of better living . . . this thing called Ultra-Violet radiation. Like visible light waves, and the infra-red and wireless waves, Ultra Violet waves also have their function in the scheme of things. Apparently that function, in human beings, is to stir up the skin until it becomes a living laboratory, producing sub stances that go through the body, building up bone and flesh and keeping the system tuned-up. Today modern science, measuring Just as a r these Ultra-Violet waves with the ONLY func Spectroscope, has divided them, ac- inasetdesli theG.E.S cording to length, into three classes: S-I)LampM Near Ultra-Violet, Middle Ultra- special equi Violet, and Far Ultra-Violet. Near tainultra-vi Ultra-Violet rays-those waves closest The Type S-i . to the visible-have some biological a"V"shapedt value. Far Ultra-Violet, on the con- pwool oustee trary, is, in nature, carefully screened a bulb ofspeci out by the atmosphere and never When the c reaches us. (These powerful rays, the fme studied by science through artificial A portion of Ultra-Violet sources, are dangerous porizes and a unless prescribed by a physician and emttedishe ele supplied under his supervision.) glass which tr According to present knowledge desirableultra. the Middle Ultra-Violet contributes most to better living. This is the Ultra-Violet which tans our skins-which is the dominating factor in producing Vitamin D. This "sunshine vitamin" promotes proper bone growth and blood content, resistance to disease and general well-being . .. And yet the power of ultra-violet penetration, as far as the human skin is concerned, is, at maximum, only about the thickness of this sheet of paper. Now the scientists of General Electric Company, after years of research, have made these beneficial Middle Ultra-Violet rays available to the general public in the new G. E. Sunlight (Type S-1) Lamp. At a distance of three feet, this source, in a proper reflector, provides the same Ultra-Violet effective ness as mid-day midsummer sunlight. The Type S-1 Lamp is the first generator of Ultra-Violet to be offered to all, which embodies (with an adequate supply of Ultra-Violet radiation) the safety, the simplicity and the economy of the modern MAZDA lamp. Although it resembles a regu lar MAZDA lamp, the G. E. Sunlight (Type S-1) Lamp will not fit or operate in an ordinary lamp socket. It must be used in a special fixture such as the General Electric Sunlamp or the equipment made by other manufacturers. This new G. E. Sunlight (Type S-1) Lamp is safe, because the bulb of special glass filters out the shorter wave lengths which are dangerous. It is simple, be cause it operates without fuss, noise or mechanism, at the touch of your fingers to the switch of the special unit. It is economical, because lamp and transformer (the transformer is part of the necessary special unit) consume only four hundred watts of electricity, and cost, on an average, only three cents per hour to operate. radio tube can tion properly ned for its use, sunlight (Type USTbeused in pment to ob olet radiation. Lamp consists of ungstenflament, lectrodes, and a rcury enclosed in al glass. current is turned tis heated imme ndescence. Sthe mercury va n arc is formed ctrodes. The light red by the special ansmits the most - violetraystoyou. the American In presenting, for home use, a safe, convenient way to get all the benefits of Ultra-Violet radiation found in midsummer sunlight, the scientists of General Electric Company have not attempted to provide a cure-all or a substitute, under any circumstances whatsoever, for the services of a physician in case of illness or disease. Used in the proper unit, the General Electric Sunlight (Type S-1) Lamp is for well people-that they may remain well-and retain the vigor, vitality, mental alertness and resis tance to disease which Ultra-Violet provides. In buying a sun-lamp of any kind for the dark days of winter ahead, insist that the equipment you select contains the G. E. Sunlight (Type S-1) Lamp. It is the heart of modern man-made sunshine, and is sold in accordance with the requirements of the Council of Physical Therapy of Medical Association. The Incandescent Lamp Department of General Electric Company Nela Park, Cleveland, Ohio GENERAL * ELECTRIC SUNLIGHT (TYPE S-i) LAMP Join us in the General Electric Program, broadcast every Saturday evening on a Nation-wide N.B .C. Network.