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plural trommels
(mining) A revolving buddle or sieve for separating, or sizing, ores. quotations examples
This trommel is very compact and will give four sizes of product.
1871, Rossiter W. Raymond, Mines and Mining of the Rocky Mountains, the Inland Basin, and the Pacific Slope, J. B. Ford & Company, page 697
A rotating drum for sorting items, such as waste for recycling. examples