Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 761
haps not larger than a peppercorn in four cubic feet of compactmaterial? The blue ground is spread out on levelled and carefullyprepared areas called depositing floors, and there, after a few monthsexposure, all but the very hardest pieces crumble down, the atmosphericaction being accelerated by… … Fig. 334^2:.—Sketch Section of the Kimberley Diamond Miiie. proportion of refractory lumps that would not disintegrate in perhaps lessthan two years. These lumps are coarsely crushed between rollers, andthe fragments are spread over slowly moving tables, from which anylarger diamonds are picked…
Inventions
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