LVIII. J. F. FURNISS. 



to the conditions under which she was running, then no 

 increase of speed in working would show any increase of 

 pressure in the column. That had been brought home to 

 him by actual experience during the last two or three years. 

 He regretted that he did not mention Mr. Selfe's pump at 

 Botany. He had run this pump on that occasion when 

 they had to fall back on the old Botany supply when the 

 48 inch main broke many years ago. He regretted also 

 that he had not spoken of the high speed engines referred 

 toby Mr. Houghton, but that was on account of the length 

 of the paper. He could speak with authority on the subject 

 of the relative value of published statements and the actual 

 facts as determined by experience, as it had for many years 

 been his practice to have trials periodically and to compare 

 the results of same with the results of the test runs. 



Mr. Selfe had remarked that the intermittent running of 

 pumps should not be allowed to influence the running costs, 

 because in trials the extra expense due to this irregularity 

 should be eliminated in the figures resulting. This was 

 already done. In trials, runs of 12 hours were taken where 

 possible ; then long runs were taken, all extraneous charges 

 being eliminated. Mr. Selfe had also said that there was 

 no storage of energy in the Hathorn-Davey pump. But 

 there was in this pump what practically amounted to a 

 storage of energy. Storage of energy in the Worthington 

 pump was only a storage from one end stroke to the other 

 end stroke, but in the Hathorn-Davey the storage was 

 arrived at by a geometrical and mechanical arrangement. 

 The Hathorn-Davey was a non-rotative engine. (Mr. 

 Furniss then indicated by illustration on the blackboard, 

 how the storage was arrived at in the Hathorn-Davey type. 

 A slide showing indicator cards from four typical pumping 

 engines in Australia was also exhibited in connection with 

 which Mr. Furniss made the following remarks:) This, 



