166 SMALL WATER SUPPLIES. 



PAGE 



Erection of turbines - 94 



of well pumps - 76 



Escarpments - - - 18 



Evaporation, loss by 15 



Examination, bacterial . 2 



Explosives, use in wells - - 45 



Faults - : J7 



Filter, simple - - 141 



size of . 142 

 Filtering media - - 141 



water . 1:40 



Filtration, efficiency of - 143 



Filters, distributing valve - - 144 



outlet from - - 144 



Flood waters - - - 116. 



Flow in channels - - - 58 



- in pipes - - 58-59, 89 

 in streams . 48 



pipes . 59 

 Flow-over gauges - - 52 

 Formulas for gauges - 53 

 Foundations for pumps - - 98 

 Francis' formula - 53 

 Friction formula - 59 

 Fuel for gas-producers - - 105 



Gas engines - - - - 101 



- 104 



- 103 

 r - 105 



Gas engines 



above sea-level 



buying - 

 - fuel for - 



governing - 102 



horse-power - - 92 



