300 



SEWAGE AND ITS PURIFICATION 



Windsor, Eastwood, and Greasley Sewage Works, and else- 

 where. Prices : 25 ft. diam., ^25 to £31 ; 50 ft., ^50 to £56 ; 

 100 ft., ^Tioo to ;fi22 ; delivery and erection, £^ to jfio extra. 



The head required is stated 

 as from 21" to 9", with a flushing 

 tank, and 15" to g' in contin- 

 uous working, with a maximum 

 distribution of 1,000 gals, per 

 sq. yd. per 24 hours, and the 

 minimum 150 gals. Below 

 150 gals, an automatic flush- 

 ing tank is found essential, and 

 is usually provided for higher 

 rates. Jennings' gauging ap- 

 paratus is on the float principle, 

 graduated over a weir. 



6. Scott - Moncrieff Distri- 

 butor, made by Manlove Alliott, 

 Ltd., for large filter beds, is in- 

 tended to be driven by power. 

 In this form the distribution can 

 be effected over the entire bed 

 with mathematical accuracy, 

 while all passages or openings 

 are of such a size that they are 

 readily accessible and can be 

 easily cleansed. Variations in 

 flow are dealt with automatic- 

 ally without alterations to the 

 distributor itself. The limits of 

 distribution range from 50 gals, 

 per sq. yd. per 24 hrs. up to 

 2,000 gals, or more. The rate 

 does not control the speed of 

 revolution as in most other dis- 

 tributors, since the driving motor 

 works quite independently of 

 the sewage, and consequently 

 each yard of the bed gets just the same dose at equal intervals 

 of time. The loss of head is practically negligible, being only 

 that which is absorbed by the pipe connections from the external 

 carrier to the centre of the bed. The apparatus is of a heavier 



