National Geographic : 1945 Dec
... what else is in store for these Man-Made Gems? rTHAT'S A GOOD QUESTION. But at this point 110 One can give you the complete answer to it. The full possibilities of these man-made gems have not been explored. The making of synthetic sapphire and ruby in this country is an infant industry-born in World War II. Prior to the w ar, all our synthetic sapphire and ruby were imported. When our supply of these war-vital materials was cut off, T'I' I INDE AIR PRODUCTS COM PANY, a Unit of UCC, at the request of the government condensed into months the research necessary to master the techniques of quantity production. Of all the gems, synthetic sapphire and ruby, like their natural forms, are second only to the diamond in hard ness. Already they have many uses. They are long-wearing thread guides in textile mills. They are the bearings in watches and delicate navi- gatlon instruments. They make phonograph needles that will far outlast metal. They are much in demand for jewelry... and are used for many types of cutting tools, gages, spray nozzles, burnishing wheels and insulators. What else are they good for? If you are technically minded and read the italicized paragraph below, you may come up with a new answer or tw o. In addition to extraordinary wear resistance and great beauty, LINDE synthetic sapphire and ruby are highly resistantto most chemicals and have high strengthat tem peratures up to 3,000 deg. F. and higher. Electrical losses at all frequencies are low. They can be given an exceptionally smooth surface, and can be bonded to other materials. They are available in half-boules up to 150 carats and in rods of 0.065 in. to 0.125 in. diameter. For additional information send for the folder E-12 "Synthetic Sapphire Pro duction." LI iHI: SYNTlHTI:I (.;l:M MIAT:IIATLS UNION CARBIDE AND CARBON CORPORATION 30 East 42nd Street [T New York 17, N. Y. Principal Units in the United States and their Products ALLOYS AND METALS- Electro Metallurgical Company, Haynes Stellite Company, Kemet Laboratories Company, Inc., United States Vanadium Corporation CHEMICALS- Carbide and Carbon Chemicals Corporation PLASTICS- Bakelite Corporation ELECTRODES, CARBONS AND BATTERIES- National Carbon Company, Inc. INDUSTRIALGASES AND CARBIDE-The Linde Air Products Company, The Oxweld Railroad Service Company, The Prest-O -Lite Company, Inc.