IKDEX. 



263 



P. Page. 



Particles, fineness of 10,11 



modes of movement of 1 1, 26-30, 200-201 



See also Fineness. 



Partiot, H. L., cited 194 



observation by , in the Loire 232 



Pitot-Darcygago, special form of, description of 251-252 



difficulties in the use of 26 



efficiency of 255 



rating of 252-256 



ratios of suction at one opening of, to pressure at the other ... 254 



variation of constant of, near boundaries of current 254-255 



Plots, logarithmic, making and study of 59-60 



Poiseuille, J. L. M., theorem established by 155 



Power function and its logarithmic locus 97-99 



Powless, W. II., observations by 232 



Precision, approximation to, for stream traction 56, 



73-74,94, 113, 142-143, 151-153 

 approximation to, for flume traction 206 



R. 



Rankine, W. J. M., formula of, for resistance of a wheel 201 



Reynolds , Osborne , on the flow of water! hrough tubes 242 



experiments by, with one liquid flowing over another 248 



on scales of model tidal basins 237 



Rhone River, observations on load of 231 



Rhythm, occurrence and influence of. 58-^59 



problems associated with 241-250 



Richards, E. H., on capacity of launders 210,216-217 



cited 226 



R iver engineering, laboratories of 16 



Rivers. See Streams, natural. 



Rolling of particles, features of 26 



observations on 200-201 



space required for 211 



S. 



Sainjon, advance of dunes formulated by 232 



Saltation, analysis of 26-30 



comparison of, with rolling 200 



definition of 15 



zone of, curves of velocity as affected by, figure showing 161 



Sand, method of collecting 24 



mode of delivering 20, 23-24 



See also Ddbris. 



Sand arrester, description of 20 



influence of, on water slope, diagram illustrating 57 



Scope of the investigation 10 



Seddon, J. A., on suspended load of Mississippi River 229 



Sensitiveness, definition of 188 



Settling tank, description of 21 



Sewers, experiments on traction in 216 



Shearing, interference by suspended particle with, diagram show- 

 ing 226 



!), relation of, to discharge 66-67 



relation of, to fineness 67-71 



to width 67 



values of, adopted for Interpolation formulas 72 



in formulas lor mixed grades of debris 169 



in formulas for streams of similar slope 11 7-119 



Sigma formula, use of 96-97 



Sigma function, discussion of. 99-100 



Sizes of debris 21, 199 



See also Debris. 



Sliding of particles, infrequency of 26 



observations on 200-201 



Slope, capacity for flume traction in relation to 203-206, 20S-209 



capacity for stream traction in relation to 55, 61-65, 96-123 



competent, definition of 35 



in flume traction 203 



observations on 69 



relation of, to 64-70,187 



definition of 35 



effect of change of, on velocity 245-246 



for straight and crooked channels, table comparing 197 



influence of, on the relation of capacity to form ratio 132 



method of determining 21, 25 



observations on, adjustment of 55-87 



Page. 



Slope, observations on, in crooked channels 196-197 



observationsjon, reduction of 37 



table of 38-54 



unit of, effect of changing 112-113 



Slope and mean velocity, relative variation of 158-159 



Slope factor, applicability of, to natural streams 233 



influence of 10 



Smith, Hamilton, tables of discharge by 259 



Speeds of particles in flume traction, table of 200 



Streams, natural, application of laboratory results to 219-240 



natural, kinds of 219 



forms of channel in 124, 222 



similar, hypothesis of 236-240 



Subsidence, velocity of 225-226 



Surfaces, rough, used in experiments on flume traction 200, 2S6-208 



Suspension, analysis of 223-230 



definition of 15 



forces active in, diagram of 224 



in natural streams 223-230 



relation of, to flume traction 200, 201 



to traction in natural streams 221-223 



Symbols, index to 13-14 



T. 



Tables, list of 5-6 



Terms, definitions of 35-36 



Thomson, J., studies by, on currents of streams 220 



Traction, definition and classification of 15 



flume, modes of 200-202 



observations on... 202-203 



stream, foreign work on 15-16 



modes of 26-34 



observations on 36-54 



See also Flume traction. 



Trassportat ion, modes of 1 1, IS, 26-34 



Trough, forms and sizes of 16 



semicylindric, capacity for flume traction in 214 



width of 22 



relation of, to a 67 



with glass panels and sliding screen 27 



with local contraction, velocities in 245 



Troughs witb bends, plans of 196 



U. 

 Units used 34 



University of California, acknowledgments to 



apparatus on campus of, plate showing Frontispiece. 



V. 



Van Orstrand, C. E. .acknowledgments to 9 



Velocity, competent, experiments on 69, 70, 162-163 



influence of suspended load on 225-230 



Influence of tractional load on 229-230 



maximum, hypothesis as to posit ion of 248 



mean, and slope, relative variation of 158-159 



computation of 94 



of streams with and without tractional load, table compar- 



ing. 



230 



methods of measuring 26 



relation of capacity to 155-163 



vertical curve of, as modified by conditions 244-247 



Viscosity, influence of 226-229 



Voids, percentage of, effect of mixed grades on 179 



Von Wagner, on the velocities of streams 155 



W. 



Water, mode of handling 19 



rhythm in the flow of 242-244 



surface of, form of profile of 57 



profiles of, showing undulat ions associated with ant idunes. 33 



relation ol slope of, to capacity 



rhythmic fluctuations of 58 



slope of, as affected by feeding 56 



Water circuit, diagram of 



Water supply, qua! ity of 



Whirls, movement of sand by 32 



Woodward, R. S., acknowledgments to 



Yuba River, observationsion '. 223-224, 230-231 



o 



