National Geographic : 1925 Jun
ks, Friction How lead helps man control it T HERE'S a fight going on in this picture. The man is winning, but at a terrific expenditure of physical energy. Every time he tugs and pulls, friction does its best to hold back the runners of his improvised carrier. Friction was one of primitive man's worst enemies. Today man has taught friction its place, has made it his friend. Not only does fric tion, by transmitting power, help to trans port you from place to place; but by means of pulleys, belts, gears and friction clutches it enables you to turn your dynamos, print your newspapers, make your shoes, and do a thousand and one other things. Yet even today, friction in the wrong place is man's enemy. The points at which fric tion is not desired are those where parts are supposed to slide or rotate. These are known as bearings. They must be a little tolerant because a shaft slightly out of true plays havoc in a high-speed machine. How man fights friction In 1839, Isaac B. Babbitt of Boston, Mass., invented a metal alloy which, when cast into bearings, would not only resist high pres sures and the wear of rapidly rotating shafts, but would also conform to the play of a shaft without breaking. From his first formula, many different types of bearing metals or babbitts have been developed to serve different purposes in in dustry. Lead is an important metal in the anti frictional alloy business and thousands of tons of it are used every year. Among other advantages it is the cheapest of any metals that could be used for this purpose. A complete line of babbitt metals is made under the well known Dutch Boy trade-mark. Among those most generally used are Dutch Boy Phoenix Metal, Dutch Boy Heavy Pressure Metal, Dutch Boy Genuine Babbitt Metal, and Dutch Boy Perfection Anti-Fric tion Metal. These bearing metals are expertly designed to perform every type of service. In addition, National Lead Company produces under the Dutch Boy brand, red lead, linseed oil, flatting oil and solder. This company also makes practically every form of lead product used by man today. Write to our nearest branch for information on babbitt metals, or for information about any other uses of lead in which you may be interested. NATIONAL LEAD COMPANY New York, III Broadway; Boston, 131 State Street; Buffalo, 116 Oak Street; Chicago, 900 West 18th Street; Cincinnati, 659 Free man Avenue; Cleveland, 820 West Superior Avenue; St. Louis, 722 Chestnut Street: San Francisco, 485 California Street; Pittsburgh, National Lead & Oil Co. of Pa., 316 Fourth Avenue; Philadelphia, John T. Lewis & Bros. Co., 437 Chestnut Street.