. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 194 THE GENESIS OF THE DIAMOND. two blocks of steel until the blocks touched without injury to the stone in the slightest clegTee. The pressure is said to have been. Fig. 1.—Diamond mines in the Kimberley District, South Africa. iTO tons to the square inch. It is a very strong reflector of light and refracts incident rays more than any other substance except ; « Tal)le of indices of refraction in Dnfrenov's Traite cle Mineralo
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 194 THE GENESIS OF THE DIAMOND. two blocks of steel until the blocks touched without injury to the stone in the slightest clegTee. The pressure is said to have been. Fig. 1.—Diamond mines in the Kimberley District, South Africa. iTO tons to the square inch. It is a very strong reflector of light and refracts incident rays more than any other substance except ; « Tal)le of indices of refraction in Dnfrenov's Traite cle Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Board of Regents; United States National Museum. Report of the U. S. National Museum; Smithsonian Institution. Report of the Secretary. Washington : Smithsonian Institution
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