INDEX 



279 



Screw-propelled tugboat, 198 

 Scott & Godsir rock-cutter, 23 

 Scow measurement, 16 

 Sea-going dredges, 63, 74 

 Sea-going hydraulic dredge, 105 

 Sea-going steam-hopper, 195 

 Selection of dredges, 50 

 Self-propelling dredges, 61-85 

 Semi-sea-going dredges, 83 

 Shaking screens, 224 

 Shrinkage of material, 18 

 Side-wheeled tugboat, 198 

 Silt or mud, 10, 187 

 Sinking fund, 258 



Single-chain attachment for grab- 

 buckets, 175 

 Sluice boxes, 225 

 Soils, 6 



clay and loam, 8 



disintegrated rock and conglomer- 

 ate, 6 



hardpan, 8 



gravel, 7 



mud or silt, 10, 187 



rock, 6 



sand, 9, 186 

 Soundings, 12 



automatic devices, 13 



graduated rods, 12 



lead line, 12 



Pardessus' method, 13 

 South American grab dredge, 172 

 Speed of pumps, 101 

 Sprocket wheels for propulsion, 8 

 Spuds, 85, 166, 179 

 Stationary ladder dredges, 85 

 Steam crane, 82, 135 

 Steam punch, 24 

 Steam hopper, 195 

 Steamer: 



" Henry Burden," 110 



"Wiggins," 143 

 Steel ram, 24 

 Stephen's ditcher, 248 

 Stirring: 



by harrow and scrapers, 141 



by propellers, 143 



by revolving drums, 145 



Stirring : 



by revolving wheels, 143 



by water jets, 144 

 Stirring dredges, 4, 61, 140 



"Caffrey," 142 



"Essayon," 144 



"McAlester," 144 



"Montana," 142 

 Stone-lifters, 53 

 Suction pipe, 95, 149 



connections, 95, 129 

 Survey along a determined course, 15 



by three points, 14 



by triangulation, 14 



Tin dredging, 217 

 Tower of ladder dredge, 70 

 Transportation of debris, 4 

 Tugboats, 58 



sidewheeled, 198 



screw-propelled, 198 

 Tumbler, 69 



Universal dredges, 132 



"Montevideo," 137 



"St. Petersburg," 133 

 Unloading barges by double-ladder 

 floating elevator, 201 



by floating elevator, 200 



barges by grab bucket, 202 



barges by land elevator, 198 



debris from hoppers, 106 



machinery, 239 



sand, 239 



Veranteus, xi 



Wages, 210-230 



of crew on electric placer dredge, 230 

 on a hydraulic dredge, 211 

 on a ladder dredge, 210 

 Walking dredge, 249 

 Water jets, 97, 144 

 Watt, James, xii 

 Work of a ladder dredge at Fox River, 



Wis., 87 



dredges on St. Lawrence River, 204 



hydraulic dredges, 109-115 



