American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 186
ne,or rather polishing, in place of the real diamondpowder. The strength of aggregation, however, iswanting in the coke, while the black diamondcarbon possesses it in the very highest de-gree, so much 80 as to render the working ofit into form a matter of great dijfficulty. Likeall other forms of… … hardness is found not equalled by the dia-mond of the purest water ; indeed, the hardnessis so extreme that after the stone is cut, butlittle of the cutting can be seen ; though Mr.Dickinson exhibited specimens that werebrought up to a very good edge. TakeFig. 2 in the cut. It is nothing more…
Clocks and watches
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