| Part of Speech | Definition | |
| Expression | 1. One of the posts which support the crank shaft of a deep-well-boring apparatus.[Websters]. | |
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Common Expressions: JACK POST
| Expressions | Definition | ||
| Jack post | One of the posts which support the crank shaft of a deep-well-boring apparatus. Source: Webster's Revised Unabridged Dictionary. | ||
Source: compiled by the editor from various references; see credits. | Top | ||
Specialty Expressions: JACK POST
| Expressions | Domain | Definition | |
| Jack post | Mining | This timber is used where the coal seam is separated by a rock band and one bench is loaded out before the other. If the top bench is worked off first, the jack posts are set between the bottom bench of the coal and the roof. If the bottom bench is cleaned up first, the jack posts are set between the bottom and the top bench. At least two jack posts should be used and as many more as is necessary to keep the top bench of coal or the roof from coming down while the coal is being loaded out. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
