. Mineral Resources of the United States, 1902. wereemployed; these were rarely drawn more than once across the great advantage of the new method will be when it isunderstood that thereby it is made possible to cut a 6-carat crystal intwo along the best line to place the main table-faces of the twostones thus produced. One patentee claims the process of sawingoff only the parts desired to be removed; the other makes a specialclaim that the dividing of the diamond at the girdle is an originalclaim apart from the former. The methods consist in holding thediamond firmly and
. Mineral Resources of the United States, 1902. wereemployed; these were rarely drawn more than once across the great advantage of the new method will be when it isunderstood that thereby it is made possible to cut a 6-carat crystal intwo along the best line to place the main table-faces of the twostones thus produced. One patentee claims the process of sawingoff only the parts desired to be removed; the other makes a specialclaim that the dividing of the diamond at the girdle is an originalclaim apart from the former. The methods consist in holding thediamond firmly and very steadily pressure against a rapidlyrevolving disk of sheet iron, or phosphor bronze. The wheelsare much like those used in sawing thin sections for microscopic rocksections or for cutting jade, rock-crystal, and other hard stones. It isclaimed that in thus dividing an octahedron at the center or girdle aslittle as 2 per cent of the weight of the crystal is lost—a great saving U. S. GEOLOGICAL SURVEY MINERAL RESOURCES 1902 PL. V.
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