780 PROCEEDINGS OF SECTION H. 



coming into contact with sludge or sewage being the hard 

 skin of the castings, which are coated with Dr. Angus Smith s 

 composition. Compressed air is for the present the best 

 practical means of transmitting such force as is here required 

 to a distance, and among the great incidental advantages of 

 its adoption in connexion with Shone's ejectors are the facts 

 that the works for generating the power may be placed 

 wherever most convenient and almost without reference to 

 where it is to be employed, and that the multiplication of 

 ejector stations does not entail a corresponding multiplication 

 of expenses. They have, furthermore, stood the test of 

 experience. 



At Eastbourne eight ejectors are used for sewage-lifting, 

 with two miles of iron mains for the compressed air, and some 

 of these have been in use for ten years. The Chairman of 

 the Drainage Committee of the Borough says, in an official 

 report : — 



" The air pipes are laid under the streets, and we have never 

 had the least trouble with them, and the observations taken from 

 time to time show that the loss by leakage and friction is practically 

 nil. The ejectors and the automatic gear are strong and simple 

 in construction, and they work in their chambers under the streets 

 noiselessly and innocuously, and need little or no repair or personal 

 attendance." 



To sum up my observations upon the Shone ejector, I 

 may say that every sanitary engineer whom I met who had 

 had practical experience of it was jjerfectly satisfied with its 

 working, not only as efficient when dealing Avitli small 

 quantities in little districts and in exceptional circumstances, 

 but as being capable of application to efficiently and econo- 

 mically collect and discharge the sewage, both solid and liquid, 

 of the largest cities. 



After this digression, I get back to the consideration of 

 the sludge left after the disposal of the clarified water. At 

 Southampton the precipitating tanks have been built with 

 dished floors sloping sufficiently to enable the sludge to flow 

 by gravitation to the outlets communicating with a Shone's 

 ejector, which, as I have above mentioned, sends it through 

 a 4-inch main to the manure works at the Corporation yard 

 a mile or two away. 



As I have now done with what takes place at the Town 

 Quay precipitating works, I may mention that it is all done 

 without creating any nuisance, the ferozone acting as a perfect 

 deodorant, as noted above in the extract from Dr. Angell. 



