ホーム > Term: hand drilling
hand drilling
A historical method of drilling blastholes in rock by hammer and a hand-held steel or bit. Single-jack drilling was done by one miner. In double-jack drilling, one miner held the steel for one or two strikers with hammers.
- スピーチの一部 noun
- 産業/ドメイン 炭鉱
- カテゴリ 炭鉱全般; Mineral mining
- Government Agency: USBM
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作成者
- ed.young
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(V.I.P) 21084 ポイント - 100% positive feedback
(Milwaukee, United States)
