LXII. J. F. FURNISS. 



He had understood that they were Hathorn-Davey pumps 

 of the differential type not triple expansion pumps.) 



Mr. Furniss then went on to explain the similarity of the 

 results attained by the different methods of storing energy 

 in connection with the Worthington and Hathorn-Davey 

 pumps respectively. The Worthington pump stored up 

 energy first and then gave it out so that this pump was 

 considerably quicker than others which had to be gradually 

 worked up to their full speed. The Worthington could 

 start right off at full head load. Mr. Houghton in speaking 

 of end thrusts had stated that he could not understand how 

 it could exist or how it was that the makers of the pump 

 did not make provision to counteract it, and that it cer- 

 tainly could not exist in a bifurcated suction pump. The 

 centrifugal pump in connection with which the end thrust 

 had caused trouble, was not a bifurcated suction pump. It 

 was the first high duty centrifugal pump that was intro- 

 duced into New South Wales. This pump depended for its 

 efficiency on the form of the impeller, the case of which 

 was so arranged that it had apertures which allowed the 

 water to pass through. Actual practice had proved that 

 it was deficient in means for counteracting end thrust. 

 Mr. Smail, in his comments, had remarked "that the cen- 

 trifugal pumps were anything but perfect in the measures 

 adopted for the prevention of end thrust." Mr. Smail had 

 had to make extensive provision to overcome this difficulty, 

 and several arrangements for this purpose had been per- 

 fected in the department presided over by Mr. Smail. 



The makers of the Reynolds pump installed at Menangle 

 did realise that there would be end thrust. The specifica- 

 tions for the contract had included provision to overcome 

 the difficulty. They had put a marine type thrust block on, 

 but it was so small, that it was found that it would not 

 overcome the resistance. In this case the pipe led along 



