| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| Block riffles | Mining | These consist of timber blocks, 8 to 12 in (20.3 to 30.5 cm) square, set in transverse rows in a sluicebox; they are arranged so that in contiguous rows the joints are staggered to prevent the development of longitudinal cracks. It is usual to separate adjacent rows by means of a strip of ordinary riffle scantling. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
