INDEX 



Agitators, 95 



Allen's scraper, 96 



American grab dredges, 168 



American dumping scows, 193 



Annual expenses, 258 



Apjohn, James H., 96 



Arnold, W. H., 181 



Arnold clamshell bucket, 182 



Austin drainage excavator, 247 



Automatic devices for soundings, 1, 3 



Babcock, Henry N., 19, 263 

 Barges, 190 



deck, 192 



open-hold, 190 



steel-decked, 238 

 Bates, Lindon W., 99 

 Belt conveyor, 88, 185 

 Bishop conical screws, 143 

 Blasting: 



at Hell Gate, N. Y., 42 



at Henderson's Point, 46 



on the Erie harbor, 30 



on the Rhine River, 29 



on the Severn River, 29 

 Boilers, 80, 115, 123, 130, 163, 181 

 Boom, 163, 169 

 Buckets: 



Arnold for clamshell dredges, 182 



clamshell, 173 



of dipper dredge, 155 



elevator, 198 



for ladder dredges, 70 



for land excavation, 246 



orange-peel, 174 



for placer dredges, 220 



Caissons for rock excavation, 34 

 Centrifugal pump, 98 



Centrifugal pump lining, 99 



runner, 124 



shell, 98, 119, 129 

 Chutes, 71, 186, 200 

 Clamshell dredges, 62, 173 



"Champion," 181 



"FinnMacCool," 178 

 Clay and loam, 8 



Comparison of methods of sounding, 13 

 Comparison of rockbreaking and blast- 

 ing, 39 

 Compressed air for clamshell bucket, 



181 



Compressed air for dredging, 147 

 Conglomerate, 6 

 Contractors' profit, 259 

 Conveyor belt, 88, 185 

 Conveyor pipe, 100, 185 

 Cost of: 



blasting rock, 37-41 



operating dredges, 253 



dredging Ambrose Channel, 263 



deep dredging at Buffalo, 269 



dredging clamshell dredge, 269 



dredging harbor of Wilmington, Cal., 

 266 



dredging ladder dredges, 261-267 



dredging Salina Harbor, 261 



dredging on St. Lawrence River, 212 



gold dredging, 232 



hydraulic dredging, 263-266 



repairing, 209, 256 



rock blasting at Hell Gate, 46 



rock-breaking, 39 



rock excavation, 37 

 Coupling for discharge pipe, 150, 189 

 Crews, 56, 93, 210, 230, 272 

 Cutters, 96 



of Lobnitz machine, 25 

 275 



