XXXVIII. 



J. M. SMAIL. 



The filters are operated as follows : — Along the front of 

 each operating table is a series of 6 levers, each of which 

 controls one of the valves in the filter. Each lever is 

 suitably marked by a brass plate giving the name of the 

 valve it controls. Directly behind each lever is an indicator 

 which shows the position of the valve. On the right end 

 of the table are two sets of push-buttons, which govern the 

 electric current to the automatic starting-gear, by means 

 of which the motors operating the wash water pumps and 

 blowing engines are started and stopped by the operations 

 of the filter. At the left end of the table are sample tubes, 

 through which raw and filtered water are pumped by small 

 centrifugal pumps located in the gallery. The pumps are 

 driven by water motors, and the valves are operated on 

 from the table. Taps are provided for drawing test samples. 

 Loss of head gauges are fixed on the table also. 



The plant has been in continuous service since September 

 4th, 1902. The staff employed when operating to full 

 capacity, 32 million gallons per 24 hours, will be 2 trained 

 men, both of whom will be familiar with analytical matters, 

 2 filter attendants, and 1 attendant in the machinery room 

 on each watch. The total force with two twelve-hour 

 watches would be 10, including the man in charge and his 

 principal assistant. The average quantity of wasli water 

 used for the entire plant is 4*2 of the water filtered. The 

 period of service between washings is 9*68 hours. 



Bacterial Results and Principal Information Relating Thereto. 

 Averages by Months. 





si" 



Turbidity 





Dolour 



Amorphous 

 Matter 



Bacteria 











. 





Standard Units 









- :: 





— 







'I 

 « 



11 





per cubic 



Per Cubic Centimetre 





f 



u 

 II 



1 



si 



> 



M 



".3 5 

 si = 



= E 



$ 



1 



ss 

 > 



u 

 si 



9 



Centimetre 





fi 



1 



111 



h 



1 



||l 





s 





« 



o 



fc 



« 



O 



ft 



P3 



o 



A 



O 







1902 

 September ... 



074 



10 



6 



3 



31 



20 



11 







5400 



3900 



190 



96-5 



1-59 



6 



5 



1 



52 



31 



7 



1100 



380 



3800 



650 



90 



97-6 





1-63 



5 



4 



2 



45 



28 



7 



280 



80 



3500 



1100 



60 



98-3 



December ... 



170 



7 



4 



1 



44 



24 



5 



450 



210 



5800 



1800 



50 



P9-1 



1903 

 January 



0-84 



6 



5 







31 



21 



5 



200 115 



4000 



1700 



110 



97-2 



