National Geographic : 1924 Jun
"Look, t it glistens. Hold it, it's heavy. Tap it, it rings." IN the light the bowl glistens with the rainbow's colors. In your hand it is heavier than the common glass bowl. When you strike it, you hear a clear, bell-like ring. Lead, that dull, unattractive metal, is responsible for the brilliance of fine glass. Because the lead used in making the glass gives it the density necessary to bend or reflect light rays, the glass has the lustre and color that cheaper glass does not have. Lead also gives weight to glass. The piece of fine plain glass or cut glass you pick up may be anywhere from 20% to 50% lead. Table glass, such as tumblers and goblets, is from 20% to 40% lead. One glass manufacturer in a year used 200,000 pounds of lead. The entire glass industry takes about 14,000,000 pounds of the annual lead production in the United States. The astronomer, the chemist, and the biologist invoke the aid of the lead glass lens in microscope and telescope. In the millions of buildings that are lighted by electricity, lead in electric light bulbs is helping to make night as much like day as possible. Lead in glass is very bashful and conceals itself so that there is no visible sign of its presence. But in its more general use as paint, you can see it on every hand. As white-lead, mixed with pure linseed oil, it protects such sur faces as wood from rot and decay. As red-lead it prevents rust from destroy- .e ing iron and steel. Producersof lead products Dutch Boy white-lead is the name of the pure white-lead made and sold by National Lead Company. On every keg of Dutch Boy white-lead is re produced the picture of the Dutch Boy Painter shown below. This trade mark guarantees a product of the highest quality. Dutch Boy products also include red-lead, linseed oil, flatting oil, bab bitt metals, and solder. National Lead Company also makes lead products for practically every purpose to which lead can be put in art, industry and daily life. If you want information regarding any par ticular use of lead, write to us. If you wish to read further about this wonder metal, we can tell you of anumber of books on the subject. The latest and probably the most complete story of lead and its many uses is "Lead, the Precious Metal," published by the Century Co., New York. Price $3. If you are unable to get it at your bookstore, write the publishers or order through us. ATIONAL LEAD COMPANY w York, 111 Broadway; Boston, 131 State St.; Buffalo, 116 k St.; Chicago, 900 West 18th St.; Cincinnati, 659 Freeman e.; Cleveland, 820 West Superior Ave.; St. Louis, 722 Chest t St.; San Francisco, 485 California St.; Pittsburgh, National ad & Oil Co. of Pa., 316 Fourth Ave.; Philadelphia, John T. wis & Bros. Co., 437 Chestnut St.