National Geographic : 1925 Feb
"S ODDER' The Glue of the Metals SOLDER is to the metal worker what glue is to the cabinetmaker. The origin of the word solder means "to make solid." Lead mixed with tin makes this solder, whose use is to join metal to metal, to seal metal containers and to patch holes in metal. Why is lead used in soft solders? Because pure lead combined with pure tin produces an alloy whose melting point is below that of either of these metals and therefore is be low that of the metals to be joined, even though these metals be lead and tin them selves. This alloy also adheres to zinc, cop per, brass and even iron and steel, joining them in perfect union. Thousands of workers use the soft solders made by National Lead Company under the Dutch Boy trademark. The Dutch Boy series of solders, numbered from 111 to 888, has been scientifically selected to cover every possible requirement of the solder user. National Lead Company also will furnish solder of any formula required, in a variety of shapes, sizes, lengths and weights. It makes bar, wire, ingot, triangular, drop, segment, round, half-round, strip, and ribbon solders. Lead in paint Of all the important uses of lead the most general of all is the use of lead paint. From lead is made white-lead, famous for genera tions for the protection it gives to the sur face it covers. House owners, more today than ever be fore, protect their properties by covering them with constantly maintained coatings of white-lead paint. They know they can depend on it to save the surface and thus save their houses from rot and decay. National Lead Company makes white lead of the highest quality and sells it, mixed with pure linseed oil, under the Dutch Boy trademark. National Lead Company also makes lead products for practically every purpose to which lead can be put. If you desire specific in formation about the use of solder for any purpose or about any of the other uses of lead, write to our nearest branch for complete information. .a' 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., 3r6 Fourth Avenue; Philadelphia, John T. Lewis & Bros. Co., 437 Chestnut Street.