7*J'8 PROCEEDINGS OF SECTION H. 



pressure shuts down the inlet valve (v^) — preventing the 

 sevrage or sludge from returning into the sevrer or tank — 

 and opens the outlet valve (v^), and forces all the contents 

 of the ejector through the outlet main. When the level of 

 the sewage or sludge is thus reduced below the level of the 

 cup (C), the weight of the hquid therein is sufficient to pull 

 down the spindle and reverse the action of the slide-valve. 

 This first cuts off the supply of compressed air, and then 

 allows that in the ejector to exhaust down to atmospheric 

 pressure. The weight of the sewage or sludge in the outlet 

 pipe then closes down valve (v^), and that of the sewage or 

 sludge in the inlet pipe opens valve (v^), and the whole 

 operation recommences, and continues as long as there is 

 sewage or sludge to flow and compressed air to act. 



