nots an hour. The sight- blocked by temporary earthen dams, or the current which has its own line of shafting, and, as each shaft would have wrought destruction. As a result, they ing of the marks was done by one observer and the carries two propellers, there are eight propellers in all. silted up,… … K.C.M.G.. P.E.S.. These consid- Engineer-in-CUief, THE NAVIGATION CHANNEL—ENTRANCE TO LOCKS FROM THE NORTH. 11902 SCIENTIFIC AMERICAN, INC.
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