bucket ladder

noun

1. a series of buckets that move in a continuous chain, used to dredge riverbeds, etc, or to excavate land
2. ( as modifier )
  a bucket-ladder dredger

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The bucket ladder, which weighs over 100 tons, exclusive of dredgings, is raised and lowered by a set of independent engines.

The bucket ladder is fitted with buffer springs at its upper end to lessen the shock when working in a seaway.

The bucket ladder works through the well in the stern and weighs with buckets 120 tons.

A suction dredger being unsuited to the work, a bucket-ladder dredger was employed.

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