National Geographic : 1930 Dec
_- THIS IS THE THIRD OF A SERIES OF ADVERTISEMENTS DEALING WITH ULTRA-VIOLET RADIATION IN THE HOME )-S From GENERAL ELECTRIC to American Mothers . . . . . 0 American mothers who are bring ing up clear-eyed, stout-hearted, tumbling future presidents, aged from one month to fifteen years, Winter with its close confinement, its short, dark days and its complete lack of health-giving sunlight, pre sents a real problem-a real chal Slenge to motherhood. No matter what other matters may occupy her Mind, the chief concern of every Smother is in answering this chal lenge of winter-in fighting off by every means in her power the many menaces of winter-and especially sun-starvation. Most mothers now know that the sun which shines on a winter day-even the clearest and brightest contains only two per cent of the vital health-main taining ultra-violet rays found in summer sunlight. Those highly beneficial rays which tan the skin, build up resistance to disease, promote nutrition, stimulate growth; which are essential in building strong bones and sound teeth and which liberate in young bodies that elusive, life-giving vitamin called Vitamin D The Sunshine Vitamin. This is the antirachitic vitamin; and during the prenataland the early growing years of life, it is an absolutely essential element for building strong bones and for sound muscular develop ment. Lucky for the future presidents of the United States, its industrial giants and its millions of other future leaders that science has dis covered another sun covered another sun- Sunlight, as the chart above indic a sun that shines as science has classified as infra-red brightly and effectively investigations, however, tend to sho in winter as summer- portance in the maintenanceof ge, that is richly endowed within this desirable ultra-violet z that is richly endowed oe . violet effectiveness. with health-maintain ing ultra-violet-that shines in cloudy weather and in dark and murky cities-that shines in the play room, in the bedroom where the children dress, beside father's easy chair, as he reads about "Ali Baba and The Forty Thieves," that beams down upon the baby's crib and mother's chaise longue. A sun, sponsored by the greatest name in elec tricity-General Electric-A sun which shines for three cents an hour. That is safe as the real sun and Join us in the General Electric Program, broadcast every * * Saturday evening on a Nation-wide N. B . C . Network. as effective. That operates without fuss or noise. Many manufacturers, including General Electric, are offering standards and fixtures, using this new sun-the G. E . Sunlight MAZDA Lamp as their source of energy. Special standards or fixtures are necessary because the G. E . Sunlight MAZDA Lamp will not operate in the ordinary lamp socket. It is the last word in man-made sunshine. At a touch of the finger, it offers, at a distance of three feet from the lamp, all the benefits and effectiveness of the BEST midsummer sunshine at midday. Alert mothers will insist that the lamp they buy contains this G. Just as aradio tube can ONLY func tion properly in a set designed for its use, the G. E. Sun light MAZDA Lamp MUST be used in special equipment to ob tain ultra-violet radiation. E. Sunlight MAZDA Lamp. They will be satisfied with nothing less than the best. They will not use it as a substitute for the service of a physician in the case of illness or disease, but they will employ it freely as an aid to glowing health not only for the children but for all the family. The G. E . Sunlight MAZDA Lamp is sold in accordance with *the requirements of the Council of Physical Therapy of the American Medical Association. For further information and an interesting booklet write The Incandescent Lamp Department of General Electric Company, Nela Park, Cleveland, Ohio. 4000 to 7600 LightR-ys(Vi.ibL.) cates, is composed of electro-magnetic waves of varying lengths which waves, visible light waves, and invisible ultra-violet. Recent scientific w that one particularband in the ultra-violet range is of special im neral health. This lies between 2800 and 31oo Angstrom units. It is sone that the G. E. Sunlight MAZDA Lamp concentrates its ultra THE INCANDESCENT LAMP DEPARTMENT OF GENERAL ELECTRIC Co. NELA PARK, CLEVELAND, OHIO Please send me, without obligation, full information about the G. E. Sunlight MAZDA Lamp. Name Address City GENERAL ELECTRIC SUNLIGHT MAZDA LAMP R.,i H, G lltr.-V iollin Summer Sul ( e lil.s . ).