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THE POPULAR SCIENCE MONTHLY.
west. The 3,000 fathoms of rope were all out at 5.50 p. m. The diagram (Fig. 8) will give an idea of the various relative positions of the dredge and the vessel according to the plan of dredging adopted by Captain Calvert, which worked admirably, and which appears, in fact,
Fig. 8.
Diagram of the relative positions of the vessel, the weights, and the dredge, in dredging in Deep Water.
to be the only mode that would answer for great depths. It represents the position of the vessel when the dredge is let go, and the dotted line (A B) the line of descent of the dredge rendered oblique by the tension of the rope. While the dredge is going down, the ves-
