DISTRIBUTION AND DISTRIBUTORS 



289 



to this type is that in the event of accident a section can be 

 removed for repair, but the w^hole bed is not throw^n out of 

 action as in the case of a moving distributor. The Stoddart 

 apparatus seems to be working well in a number of small in- 

 stallations, but owing to the extended exposed surface of the 

 septic sewage on the corrugated sheeting, precautions have 

 frequently to be taken to prevent smell or nuisance arising, 

 so that the filter bed is frequently covered over. 



Fig. 36. — Attachment of Distributor to Channel. 



Fig. 37. — Trough Sheeting. 



The following are types of upward jet sprayers. Obviously 

 this system of sewage fountains is not to be recommended in 

 exposed situations in the neighbourhood of dwellings where a 

 fine spray can be blown about to some distance, both on account 

 of aerial nuisance and the possibility of the distribution of 

 pathogenic organisms. 



(b) Spraying Nozzles at Salford Sewage Works. The 

 general arrangements have been described in Chap. X. The 

 nozzles are fixed on the gridiron of pipes, and work with a 

 head of 3 or 4 feet, but there is commonly sufficient pressure to 

 cause the liquid to spout out to a height of 5 to 8 ft., and it then 

 falls like rain on the surface of the filter. The delivery is about 



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