Mr. WM, PAIRLEY observed that the Paper was descriptive of Mr. Fairley. works for the treatment of sewage by sedimentation only, the outfall being into a river which appeared to be tidal at the point of outfall discharge, although that was not quite clear, as the high water and low water mentioned might be fluctuations in the riverlevel. The Paper gave very full details of the construction of the works and the pumping-plant, which were chiefly of local interest. If the reasons for the design and the analysis of the results obtained by the works were included, the Paper would be of general value. An analysis of the sewage was given (p. 132), but no analysis of the resultant effluent from the works was mentioned, nor the standard (if any) required by the river authority. The volume of watersupply differed materially from that usual in this country, and whether it was a fact that three times the water-supply would give
CORRESPONDENCE ON THE[Minutes of Mr. Fairley. sewers, a flow of twice the dry-weat.her flow occurred very frequently. Mr. C. T. A. HANSSEN remarked that the excessive quantities of Mr. Hanssen.
CORRESPONDENCE ON THE [Minutes ofHr. Hanssen. the centrifugal pumps, the efficiency of a pumping-plant had always been calculated from the ratio between t,he power of the prime mover and the work represented by the weight of water lifted to a certain height. That efficiency, in high-class steam pumping-engines raising potable water, could be as high as 93.6 per cent., as shown1 by Downloaded by [ RICE UNIVERSITY] on [11/09/16].
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