| 单词 | ripple box |
| 释义 | > as lemmasripple box ripple box n. (a) Mining a box containing ripples (sense 4) for use in extracting particles from a flow of water (now rare); (b) an electrical device for producing an appearance of ripples. ΚΠ 1853 Alta California (San Francisco) 31 May 2/1 Repeated instances have come to our knowledge when the amount of gold saved has been doubled by a little alteration or improvement made in the ripple-box. 1855 W. Howitt Land, Labour & Gold II. xxxii. 193 Two men with shovels..throw out as fast as they can the stones which are washed clean, all the dissolved earth having escaped through the grate..and left the particles of gold in the ripple-box below. 1906 P. Galvin N.Z. Mining Handbk. 86 The gold won is a fairly coarse sample, and is readily saved over 103 ft. of specially made ripple-boxes. 1998 F. Reid Discovering Stage Lighting (ed. 2) i. ii. 37 Water ripples can be projected at short range by a ripple box in which a perforated cylinder rotates in front of a long linear lamp. < as lemmas |
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