Correspondence. Glasgow Main Drainage.

Abstract

Mr. Morton. delivered directly into his precipitation-tanks. With regard to the use of snifting-valves on large pumps, the statement in the Paper (p. 235) was perhaps too universal, and he was quite willing to say, " were often fitted." I n sewage-pumps the snifting-valve was very useful, but there was no necessity to use it t o such an extent as to seriously reduce the displacement efficiency of the pumps. The pumps described in his Paper could run quite well without snifting-valves. The question as to the efficiencies when the snifting-valves were open was fully answered a t the foot of p. 235. The trials carried out with the engines had been made scrupulously under working-conditions, with ordinary fuel, and without special preparation.