CHAPTER XXII 

 DESCRIPTIONS OF CLAMSHELL DREDGES 



THE clamshell dredge "Finn MacCool," the dredge illustrated 

 in Fig. 55, was employed on the extension of the Buffalo breakwater, 

 and was operated very successfully under adverse conditions. 

 The great depth of water, the nature of the material and the large 



FIG. 55. Dredge "Finn MacCool." 



amount of excavation indicated that a large clamshell dredge 

 would be the machine best adapted for the work. It was, therefore, 

 decided to employ a clamshell dredge, and the contract for such a 

 machine was awarded to the Osgood Dredge Co. of Albany, N. Y., 

 by Hughes Bros. & Bangs, the contractors for the breakwater. 

 The capacity of the bucket was fixed at 10 cu.yds., and the hull 

 and machinery were designed with this capacity as a basis. 



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