Candy-Whittaker bacterial tank, 60
” ” distributors, 106
Capacity of contact beds, 222
” of detritus tanks, 23
” of effluent settling tanks, 182
” of percolating filters, 222
” of sedimentation tanks, 29
” of storm-water tanks, 227
“Capillary trough” distributor, 146
“Carlton” adjustable fixed spray, 152
“Carlton” distributor, 123
“Carlton rotor” distributor, 121
Chemical mixers, 72
Cleaning gear for spray holes, 119, 122, 125
“Coleman” dosing valve, 168
Columbus fixed spray, 155
Contact beds, 189
” ” apparatus for, 205
” ” capacity of, 222
” ” filling material for, 203
” ” general design of, 190
” ” methods of construction of, 196
” ” ” of distribution on, 199
” ” method of operation of, 191
” ” necessity for testing, 198
” ” sub-drainage of, 201
“Cresset” distributor, 110
Decanting valve, 49
Detritus tanks, 23
” ” capacity of, 23
” ” Dortmund type of, 25
” ” sludge scraper for, 27
Dibdin, W. J., 68, 189
Digby meridioniser, 243
Disc sprays, 155, 157
Distribution by flooding filters, 157, 186
” methods of, 104
Distributors, 106
” cleaning gear for spray holes of, 119, 122, 125
” fixed, 143
” power-driven, 129, 140
” revolving, 106
” travelling, 138
Dortmund tanks, 25, 51, 52
Dosing apparatus, 166
” tanks, 162
” ” disadvantages of, 160
” ” necessity for, 159
Drainage of filters and beds, 90, 201
Ducat filter, 144
Effluent settling tanks, 182
Elliott and Brown, 59
“Facile” distributor, 119
Feed channels, 163
“Fiddian” distributor, 127, 138
Fieldhouse tank, 65
Filtering material, 101
” ” grading of, 103, 204
Fine-grain filters, 185
Fixed distributors, 143
” sprays, 147
Floating arm, 48
Floor-tiles, 91
Gauge weir penstocks, 233
Grading of material, 103, 204
Gravity disc sprays, 155, 157
Grit chambers (_see also_ DETRITUS TANKS), 23
Haller and Machell, 145
“Hanley” distributor, 140
“Hartley” distributor, 130
“Hodgson” distributor, 127
Humus pits, 182
Hydro-extractor for sludge, 81
Hydrolytic tank, 52
Hypochlorite solutions, 242—247
Imhof tank, 57
Intermitting valves (_see_ DOSING APPARATUS)
“Kessel” tank, 63
Lowcock, S. R., 51
Low-draught syphon, 167
Massachusetts Institute of Technology, 155
Material for filters and beds, 101, 185, 203
Measuring apparatus, 232