Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 755
ly miners seldom penetratedmore than a foot or two beneath the surface. But it was discovered that,so far from it being true that diamonds are present in superficial depositsonly, the finest stones are met with at considerable depths to which nodefined limit can be assigned; thus in sinking a well… … Fig. 333.—Sifting at the Dry Diggings^ {c. 1870). The rapid rise of localities under such conditions may be illustrated bythe case of Du Toits Pan, which is the centre of a dry-digging district,and grew in a wonderfully short space of time from nothing to be a townhaving several large hotels, two…
Inventions
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