NOTATION. 



Certain letters are used continuously in the 

 volume as symbols for quantities, a definition 

 accompanying the first use. These are ar- 

 ranged alphabetically in the following list, 

 with brief characterization and page reference. 

 The list does not include letters used tem- 

 porarily as symbols and defined in immediate 

 connection with their use; and if the same 

 letter has both temporary and continuous uses 

 only the continuous use is here given. 



Page. 



A A constant of the Pitot-Darcy gage. 254 



(A), (B), etc Grades of debris, separated by 



sieves 21 



(A, G 4 ), etc Mixtures of debris grades, the let- 

 ters and figures indicating com- 

 ponents and proportions 169 



a A pressure constant (Lechalas) ... 193 



<T Numerical constant in equation 



C=b 2 (\-ctR)Rm 125 



Accents (' x A v ) . An accent over the symbol of a 

 variable indicates the nature of 

 its influence on a function. 

 Thus A=f(6, , t), E) states 

 that A is an increasing function 

 of B, a decreasing function of C, 

 a maximum function of D, and a 



minimum function of -B 96 



6 A constant in equation (109) 191 



6' A constant depth in equation (21) . 88 



>i A constant capacity in equation 



(10) 64 



& 2 A constant capacity in equation 



(54) 129 



63 A constant in equation (64) 139 



* 4 A constant in equation (75) 151 



& 5 A constant in equation (91) 186 



C Capacity of a stream for traction of 



debris (in gm. /sec.) 35 



C T Readjusted value of capacity. . . 141, 151 



c Constant coefficient in y=cx 1 99 



c, Constant coefficient in C=e 1 S il ... 109 



D Mean diameter (in feet) of particles 



of debris 21 



d Depth of current (in feet) 33 



d Differential 97 



E Efficiency of stream for traction of 



debris; capacity per unit dis- 

 charge per unit slope; CjQS 36 



e Base of Naperian logarithms 61 



F Linear fineness of debris; the re- 

 ciprocal of /) 21, 183 



FI Bulk fineness of debris; the num- 

 ber of particles in a cubic foot. 21, 183 



ft. /sec Feet per second; unit of velocity.. 34 



f t. 3 /sec Cubic feet per second ; unit of dis- 

 charge 34 



g Acceleration of gravity 225 



gm./sec Grams per second ; unit of load and 



of capacity for load 34 



B Range of fineness 96 



B, HI Readings of comparator, Pitot- 



Darcygage 254 



I Synthetic index of relative varia- 

 tion 99 



I\ /for capacity and slope 122 



la /for capacity and discharge 147 



/i /for capacity and fineness 153 



fas /for capacity and depth, slope 



being constant 164 



/rf /for capacity and depth, discharge 



being constant 164 



far /for capacity and depth, mean 



velocity being constant 164 



/< /for efficiency and slope 122 



Is /for capacity and slope, form ratio 



being constant 119 



Iv /for capacity and mean velocity. 157 



Ivs /for capacity and mean velocity, 



slope being constant 157 



/K /for capacity and mean velocity, 



discharge being constant 157 



Ivd /for capacity and mean velocity, 



depth being constant 157 



I w / for capacity and slope, width 



being constant 119 



i Index of relative variation; ex- 

 ponent in y=vx* 99 



t'i i for capacity and slope 99 



j' 2 ifor capacity and form ratio 130 



i 3 ifor capacity and discharge 141 



t 4 i for capacity and fineness 153 



j Exponent in^=er' 99 



;, Exponent in C=c 1 S h 109 



K, I- Constants of the Pitot-Darcy gage. . 254 



K A constant discharge, correspond- 

 ing to competent discharge 139 



L Length, as a dimension of units. . 139 



L Load; mass of debris transported 



through a cross section per unit 



time (in gm./sec.) 35 



M. Mass, as a dimension of units. . . . 139 



13 



