354 



Lock*, battered walls. 157 



calculations for, 147-154 

 chocks on, 162 

 coffer-dams for, 141, 159 

 coffer- walls, 158 

 description of, 146 



n of, 144 



details of construction, 155 

 double, 138 

 drains, 158 

 finish of walls, 163 

 floor. 155 

 foundation, 140 

 gates. 174 

 gauges. 40. 163 

 guide cribs, 160 

 height. 139 



investigations for, 134 

 lift. 138 

 location, 131 

 maneuvers, 147 

 materials of construction, 143 

 miter sills and walls, 158 

 origin, i. 146 

 panels, tile, 163 

 paving. 159 

 quoins, 158 

 sizes of, 137 

 snubbing posts. 162 

 statistics of. 273-293 

 valves, 195 



width <>f chamber, 138 

 wing- walls, 156 

 Locks, concrete, 163 



broken-stone aggregate, 165 

 cement, 166 

 coping, 171 

 cost, 173 

 facing, 171 

 forms, 166171 

 general design, 163 

 gravel for aggregate, 165 

 materials. 164 

 mixing and placing, 170 

 monolithic construction, 172 

 mud, effect of, 165 

 proportions, 164 

 sand, 165 

 Lock gates, 174 



alignment, 189 

 anchor-bars, 187 

 assembling, 182 

 bonnets, 188 

 calculations, 175, 181 

 care, 189 

 cost, 193 

 design, 184 

 framing, 181, 184 

 kinds, 174 



of timber, 183 

 hand-rails, 189 

 life. 189 

 metal, 183 



methods of operating, 191 

 miter- joint, 189 

 pintles, 187 

 sheathing, 186 

 sizes of beams, 182 

 spacing of beams, 181 

 specification, 326 

 wooden, 181 

 Lock specifications, 306 

 Lock-tender's dwelling, 298 

 Loire levees, 100 



report on reservoirs for, 115 

 Long. Col., used scrapers for reducing bars, 43 

 Longitudinal dikes, 59 



Louisville and Portland Canal, 284 

 Low-water mark, changes in, 13 



Maintenance of levees, 89 

 Maneuvers of A-frame dam, 256 

 Boul gates, 241 

 curtain dam, 244 

 locks, 147 

 needle dam. 217 

 Thenard shutter, 259 

 wicket dam, 230 

 Masonry dams, 207 



ne, spu ideations, 321 

 Masters, liability of, 345 

 Materials, concrete, 164 



construction, locks, 142 

 dikes, 63 

 gauges, 39 

 jetties, 127 

 levees, 82 



Mattress revetments, 70 

 Measurement of velocity, 35 



by current meters, 36 



floats, 35 

 gauge tubes, 36 

 hydrodynainometer, 37 

 Metal lock gates, 183 



gauge*, 



Methods of improving river outlets, 125 

 operating lock gates. 191 

 putting in fixed dams, 203-205 

 sounding, 2528 

 Mid-deptli. ratio of 

 Mirowitz, Bohemia, dam at, 271 

 Mississippi floods. 1 18 

 jetties, 129 



Mitering lock gates, 174 

 Miter joint for lock gates, 189 

 sills, 157 

 walls, 158 



Mixing and placing concrete, 170 

 Monolithic concrete, 172 



Monongahela River dams. 285 



Morris. Klwood, advocated storage for Ohio, lot 

 Mouth of Brazos River, 124 

 Movable dams, 208 



Hohemia. 269-271 



calculations, 212, 213 



classes, 209 



conditions to be fulfilled by, 211 



design .210 



drift chutes in. 215 



foundations. 215 



height of sills, 212 



history, 208 



kinds, 209 



lifts, 210 



recent construction of, 268 



regulating weirs in, 215 



remarks on. 216 



statistics of, 273-293 

 Muck-ditch in levees, 86 

 Mud. effect of, ill concrete, 165 

 Muscle Shoals Canal, 292 

 Muskingum River dams, 288 



Natural cement specifications, 337 



reservoirs. 102 



Navigable depths of locks, 136 

 Navigation, progress of, i 

 Needle dams, 217 



Belgium. 221 



calculations, 222 



cost, 226 



dimensions, 225 



history, 217 



