| 单词 | pointed box |
| 释义 | > as lemmaspointed box pointed box n. Mining (now rare) a pyramid-shaped box in which ores are separated in a current of water. ΚΠ 1871 W. P. Blake Notices of Mining Machinery 241 This is another modification of the conical tubs or pointed boxes, but the shape is rectangular. 1893 T. Reunert Diamonds & Gold 58 The heavy deposit, with the diamonds, passes through the screens into pointed boxes below, whence it is drawn off at the lowest point of the box and taken to the sorting tables. 1940 Chambers's Techn. Dict. 794/1 Spitzkasten, an open pointed box or cone classifier, for the water-sizing of crushed ore. < as lemmas |
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