PUMPING MACHINERY OF THE WATER AND .SEWERAGE BOARD. LVII. 



sure be most interesting to members, and if the data 

 obtained on tests of the modern plants, both at Ryde and 

 Grown Street could be made available, the tests being 

 conducted on the lines laid down for testing pumping 

 machinery they would afford comparison between steam 

 driven and electric driven pumps of large power and be of 

 great advantage to the engineering profession. 



Mr. Furntss (in reply) said he was in a very unfortunate 

 position in one respect in that he would hardly have known 

 his paper as it came from the printer, so much was it cut 

 down, except for the diagrams. The usefulness of the paper 

 had been, he thought, to a very great extent reduced on this 

 account. However, notwithstanding the small number 

 present, he was very pleased with the interest shown by 

 those who had spoken. They had dealt with the paper 

 exhaustively and time would compel him to be compara- 

 tively brief in his reply. He had to clear away some 

 misapprehensions which arose in the minds of members, due, 

 in many instances to their experience having been quite 

 foreign to pumping practice. One was in connection with 

 the practice which applied to pumping engines with regard 

 to the measuring of their duty and the preparation of 

 figures illustrating that duty. 



In proceeding to review the remarks, he would like to 

 explain one thing. One gentleman spoke of the relative 

 values or efficiencies of centrifugal pumps and their speeds. 

 He had dealt fully with that point in his paper, where he 

 had clearly pointed out that there was a speed at which a 

 centrifugal pump should be run, and that speed was cer- 

 tainly more effectually arrived at by actual trial than by 

 any figures that could be supplied. No gauge on the 

 discharge pipe would give any indication of the want of 

 efficiency of a pump; he meant that, after the pump had 

 been fitted up and had acquired the peripheral speed due 



