National Geographic : 1923 Sep
Lead sails the seven seas KE away the lead used in steamships and they would drift perilously on unknown seas. Passengers would be in danger. Commerce between continents would halt. Keeping the liner on its course Lead is used in making the glass telescopic lens of the sextant which helps the navigating officer determine latitude and longitude. It is in the lenses of the binoculars the ship's officers use constantly. Down in the bowels of the ship lead is working day and night in the bearings of the machinery, helping to eliminate friction and keep the vessel moving steadily through the waves. Down to the floor of the ocean This ship again uses lead in feeling its way through strange waters. The sounding lead di rects the ship along a safe channel by measuring the depth of water under the keel and telling the navigator the nature of the bottom. Lead weights that do not rust are on the back and breast plates of the diver's armor, while shoes weighted with lead help to carry him below the surface and keep him there. Lead in the submarine Lead is used inside the submarine. Storage batteries, mostly all lead, help to propel the under sea craft when it gets below the surface. Hydrometers, which measure the specific gravity of the battery acid, are weighted with leaden shot. In the generators which charge these lead stor age batteries are bearings of babbitt metal which often contain lead. The windings of wire are held in place with lead-and-tin solder. Hard and soft rubber insulation, electric light bulbs, and various electrical devices also have lead in them. Keels of racing yachts are weighted with lead -egaLand because it takes up little room °-near- for its weight and does not yO corrode. The protection paint gives But it is as paint that you are probably most familiar with lead. You have seen a steamship with its hull a bright red from the first coat of red-lead paint. Such a paint sticks firmly to metal and prevents moisture and salt spray from cor roding it. White-lead, on the other hand, is invaluable as a protective coat for other surfaces, such as wood and plaster. The professional painter uses pure white-lead, mixed with pure linseed oil, for ex terior surfaces, and mixed with flatting oil, for interior walls. Property owners who never seriously considered before the importance of the phrase, "Save the surface and you save all," are now protecting their houses with white-lead paint. Look for the Dutch Boy NATIONAL LEAD COMPANY makes white-lead and sells it, mixed with pure linseed oil, under the name and trade-mark of Dutch Boy white-lead. The figure of the Dutch Boy is reproduced on every keg of white-lead and is a guar antee of exceptional purity. Dutch Boy products also include red-lead, linseed oil, flatting oil, babbitt metals, and solder. More about lead If you use lead, or think you might use it in any form, write us for specific information. NATIONAL LEAD COMPANY New York, 111 Broadway; Boston, 131 State St.; Buffalo, 116 Oak St.; Chicago, 900 West 18th St.; Cincinnati, 659 Freeman Ave.; Cleveland, 820 West Superior Ave.; Pittsburgh, National Lead & Oil Co. of Pa., 316 Fourth Ave.; Philadelphia, John T. Lewis & Bros. Co., 437 Chestnut St.; St. Louis. 722 Chestnut St.; San Francisco, 485 California St.