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Scientific American, Vol. 70, No. 25 (June 1894) (1894)

leaf 3

An illustration from Scientific American, Vol. 70, No. 25 (June 1894), 1894, leaf 3
to a pair of tate the frequent and ready part of attachment, and in plain view of the opera- constant bellows, and a brisk current of air continued cleaning out of the filters. The tor. The screw on the left is used when marking filtering cylinder, or the filter tucks and that on the right when… … THE BERKEFELD FILTER. © 1894 SCIENTIFIC AMERICAN, INC

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