XXX. J. F. FURNISS. 



have been so successful in large plants as the balance 

 piston type, operated by fluid pressure similar to the foot- 

 step block adopted by the vertical turbine generator makers. 



Based upon the author's experience, he draws the follow- 

 ing conclusions :(1) That the triple expansion direct acting 

 rotative pumping engine with all latest improvements 

 adopted has brought the steam consumption per HP. per 

 hour down to the lowest point. (2) The direct acting non- 

 rotative high duty pumping engine is next in order for 

 economy of consumption, but has advantages which the 

 first does not possess, viz.: longer life, less cost in up-keep 

 and a steady flow of fluid pumped. (3) The steam driven 

 centrifugal pump is next in order for large installations. 

 (4) That electrically driven pumps in large installations 

 can never produce work so economically as steam until 

 electricity is much cheaper in cost as the following shows: 



Fuel cost per HP. per annum coal at 10/- per ton £5 2s min. 



£19 lis. max. 

 Present cost of electricity per annum per HP. £36. 



The author has collected some data as to steam used per 

 HP. per hour and piston speed in feet per minute as under: 



-co; • Piston Steam per 



Effieienc y- Speed. HP. p. h. 



Water works, Copenhagen 159'8 ft. 22*7 lbs. 



Hampton, marine type 297 ,, 15*9 ,, 



Liverpool, triple type 203 ,, 14*2 ,, 



Press. Feed. 



Nordberg, American 215 fibs. 311 ft. 12'26„ 



Old Botany Beam type 30*0 ,, 



92°/° Crown-st. Worthington 144 „ 22*0 „ 



85°/° Marrickville Hathorn-Davey 108 „ 24'0 „ 



90 j> Ryde Compound Rotative 144 ,, 2P0 ,, 



92 fc Spottiswoode Hathorn-Davey 171'9„ 13*0 „ 



The paper was illustrated by numerous lantern slides of 

 which some are reprduced: — 



