ladder dredge

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The Lost Colony of Roanoke, North Carolina, where 115 people mysteriously disappeared c. 1590. John White discovers the word Croatoan carved onto a tree upon his return to the deserted Roanoke Colony in 1590

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ladder dredge

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In dredge
A ladder dredge employs a continuous chain of buckets rotating around a rigid adjustable frame called a ladder. When the ladder is lowered to the bottom at a slant, the empty buckets descend along the underside to the bottom, where they dig into the mud; the…
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