| 单词 | bulb of percussion |
| 释义 | > as lemmasbulb of percussion b. bulb of percussion, the convex protuberance on the fractured surface of a flint. ΘΚΠ society > occupation and work > equipment > tool > types of tools generally > prehistoric tool > [noun] > part of bulb of percussion1872 1872 J. Evans Anc. Stone Implements xii. 247 Where a splinter of flint is struck off by a blow, there will be a bulb or projection, of a more or less conical form, at the end where the blow was administered... This projection is usually known as the ‘bulb of percussion’. 1902 C. H. Read Guide Antiq. Stone Age (Brit. Mus.) 115 A ‘bulb of percussion’ is the characteristic mark of a worked flint. 1910 Encycl. Brit. II. 344 Even the one feature that is commonly held to determine human agency, the ‘bulb of percussion’, cannot be considered satisfactory without collateral evidence of some kind. 1923 Discovery Dec. 316/2 Even the bulb of percussion which arises when a flint is broken by a violent blow, owing to the elasticity of its substance, can be produced by [natural] forces. < as lemmas |
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