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THE POPULAR SCIENCE MONTHLY 



west. The 3,000 fathoms of rope were all out at 5.50 p. m. The dia- 

 gram (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. 



dlageam op the relative positions op the vessel, the weights, asx> the dredge, in deedg- 



ing in Deep Wateb. 



to be the only mode that would answer for great depths. It repre- 

 sents 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- 



