The explorations of antiquaries have revealed more than one of the open-air workshops in which the primitive tool-makers plied their trade. Near Crayford, on a sandy beach beneath an old chalk cliff that overhung the Thames when on its southern side its bed was nearly two miles wider, excavation discovered the surface, strewn with flint flakes, in actual contact with mammoths’ bones, on which the workers had lived and toiled until a great flood drove them away, leaving the sediment which for countless ages concealed their remains. The inferior quality of the flint showed that they had not known how to win it by mining from the rock, but had been obliged to content themselves with such stray blocks as they could find. The enthusiast who discovered the site was actually able to fit many of the flakes together, and to reconstruct the original blocks from which they had been struck off.[130] At Caddington, where hammer-stones and punches, great blocks of flint which had been used as anvils, and innumerable flakes and cores bore their silent testimony, Mr. Worthington Smith inferred from the confusion in which finished and unfinished tools were left that the settlers, terrified perhaps by some violent storm, had suddenly quitted their abode. He found an implement which had been ruined by an ill-directed blow of the hammer, and one which had been re-flaked and re-pointed by a later worker; and his practised eye detected that the craftsmen had flaked their tools differently from those of Crayford.[131] Speaking generally, however, the methods of working were the same as those which are still followed by the ‘knappers’ of Brandon in Suffolk, who manufacture gun-flints for African savages. The flakes which were to be used as knives or scrapers were detached from the blocks by a stone hammer; and the larger implements were trimmed into the various shapes which have been described, by blows along their edges, which chipped off small splinters. The effect of the hammer was to produce on the flake, just below the point where the blow was delivered, a protuberance, which is called the ‘bulb of percussion’, and which of course left a corresponding cavity on the block from which the flake was detached. This bulb is the mark by which a manufactured flint may be recognized; but on tools whose artificial origin is manifest even to an untrained eye it has often been obliterated by the process of chipping.[132]
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