162 



When the first ditch is filled with sewage to the top line of 

 stones, the connecting pipe will conduct the surplus to the 

 next lower ditch. In order to promote the purification of 

 the sewage as well as increase its value as a fertilizer, these 

 blind ditches will he ventilated. iVt the dead ends of each 

 ditch a hand hole will he brought to the surface, the external 

 opening of whicli will probably be reduced to a diameter of 

 2 inches. A tube or chimney stack will be erected over the 

 man hole of the distributing tank at the center of the field. 

 This tank is located at the highest part of the field and Avill 

 be filled with warm sewage, so there seem to be all the 

 requisite natural conditions to insure circulation of air in at 

 the dead end manholes along the main distributing pipes to 

 the distributing tank. 



The shaft will be 20 feet high, more or less, as required 

 to promote free ventilation in connection with an intermit- 

 tent flow of sewao-e. 



By this method it is expected the sub-soil of the whole 

 field will be constantly saturated and act as a filter and that 

 practically pure Water will percolate into the under 

 drains. This system would seem to promise great agricul- 

 tural returns as an irrigation scheme. We hope to properly 

 clarify our sewage and obtain the most surprising crops 

 of grass, corn or vegetables from this field. The field is al- 

 already partly ditched. 



If kitchen grease, solid matter and sludge can be sepa- 

 rated from the sewage and kept from these blind ditches, 

 this system of sewerage will certainly solve our trouble 

 over sewage disposal when a sufficiently large field shall 

 have been ditched. 



To accomplish the screening process a new separating 

 tank, about 50 feet long will be built of brick according to 

 plans by, and under the direction of Mr. F. L. Union, engi- 

 neer of the Union Construction Co., Boston, who holds pat- 

 ents upon sewage tanks. Mr. Union also superintends the 

 ditching and pipe laying in the field. 



