170 



Index, 



Centrifugal pumps, points of a good 

 pump, 96 



angles of blades, 96 



« with horizontal spindles, 



97 



vertical spindles, 98 



guide blades, 99 



action of, 100 



velocity of water through, 



100 



diagram of working, 10 1 



efficiency of, loi 



adaptability to varying 



heads, 93, 103 

 sizes and discharge, table 



of, 105 



gearing for, 103 



statical height of water 



supported by, 103 

 substances 



passmg 

 through, 94 

 description of, at Burnt 



Fen, 119 



IS' 



- Bullewijker, 149 



- Bijlmermeer, 150 



- Beemster Polder, 



134 



118 



131 



Ferrara Marshes, 



Fondi, 137 



Fos, 135 



Grootslag, 103 



— Gallejon, 137 



Glassnioor, 126 



Katatbeh, 156 



Lade Bank, no 



Legmeer Polder, 104 



Messingham, 127 



Middel Polder, 104 



Minden, 153 



Prickwillow, 121 



— , Redbourne, 129 



Whittlesea Mere, 



Wexford Harbour, 

 Zuidplas Polder, 150 



Clearance of scoop wheels, 74 

 Coal used per h.-p. for engines, 6 1 



quantity not proportional to 



lift, 62, 148 

 used depends on engine 



man, 61 



. by Dutch machinery, 61 



— Dutch contracts respecting 



quantity, 62 



consumption of, at Halfweg, 62 



Codigoro, centrifugal pump at, 94 

 Coode, Sir J., on rainfall, 9 

 Cooke, Mason, trials oi Hundred 



Foot wheel, 114 

 Cost of pumping station, (>(} 



•> for maintenance, 68 



Cubitt, Sir W., on scoop wheels, 72 

 Cuppari, Sig., on water-raising 



machines in Holland, 52 



D. 



Danube river, deepening by scour, 



22 

 Deeping Fen drainage engines, 106 

 deepening drain by scour, 



20 

 De Witt, Messrs., drainage engines 



erected by, 54 

 Dirtness wheel, 130 

 Dorn^, trials of pumps, 136 

 Drains, slope of sides, 15 



depth and width of, 10 



land occupied by, 16 



proportion of width to depth, 10 



example of size of, 25 



table showing dimensions and 



capacity, 167 



engine, 63 



cleaning and removal of weeds, 



17, 18 



— sizes of, 24 



— fall in surface, 14 

 field drain, 44 



Drainage by gravitation, 3, 7 



steam power, 50 



field, 36 



effect of, in drought, 37 



