| 摘要 |
A carriage for supporting settling-tank scrapers, grit extractors, or filter-bed or sludge-lifting apparatus, and reciprocated longitudinally along the tops of mutually-parallel walls bounding, or dividing the width of, the tank or bed has resilient-tyred supporting (including driving) wheels, and is laterally guided by further resilient-tyred wheels mounted thereon for engagement with the wall sides. |
