| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| Hand drilling | Mining | 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. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
