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Scientific American, Vol. 77, No. 22 (1897) (1897)
leaf 3
——____——_9 0 +e the gates when the pressure is in equilibrium, the weir causes the lifting of the locking disk and the freeing of The World’s Production of Coal. commencing to discharge when the water rises above the key, when the cut-off disks move to non-registering The following table has been… … © 1897 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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