Reports of Judges. 87 



SECOND GROUP. 



« 



EEPOET OF THE JUDGES UPON THE TRIAL OF FUMPS. 



The undersigned, judges of Group 2 in the 5th Department, 

 respectfully submit the foUoM^ing report: 



First Division — Pumps Practicallt Tested 



No. 780. Steam Pump, James Clayton, Brooklyn, N. Y. 



661. do Knowles & Sibley, Warren, Mass. 



668. do Woodward Steam Pump Company, New York city. 

 929. do Campbell & Hardick Brothers, Brooklyn, N. Y. 



662. Centrifugal Pump, Turbinate Pump Company, New York city. 



669. Steam Yalveless Pump, Chappell Manufacturing Co., New York city. 



To ascertain the comparative merits of the steam pumps, each 

 pump was in turn placed over a large cistern from which it received 

 water, which was first delivered into two measuring tanks, so 

 arranged that one was being filled while the other was emptjdng 

 into the cistern. Each pump was supplied with steam from the 

 same boiler, and as far as possible, the same pipes were used in all 

 cases. 



FiEST Trial. — To determine the relative economy of the pumps: 

 The pump was put in regular operation, and the trial commenced 

 when the water fell in the boiler by evaporation to a mark on the 

 boiler gauge, and it ended when the water had fallen to a similar 

 mark placed six inches below. The steam gauge attached to the 

 boiler showed sixty pounds, at the commencement of trial, and the 

 fire was regulated so as to keep it at the same pressure while it 

 continued. In this way the quantity of steam used b}'^ each pump 

 «vas made practically the same. 



Attached to the discharge-chamber was a pressure gauge; and 

 by means of a stop-valve the pump delivered its Water, against a 

 pressure of sixty pounds per square inch, into the measuring tanks. 



During this trial the power exerted by the engine was measured 

 by the indicator, while the cost of the power was estimated from 

 the quantity of water evaporated in the boiler; and the duty of 

 the pump by the number of gallons delivered into the tanks. 



Secoistd Trial. — To determine the maximum rate of discharge, 

 with a pressure of sixty pounds on the boiler, and delivery against 

 a pressure of sixty pounds: the pump to exert its maximum capa 

 city of discharge. 



Third Trial. — To determine the minimum rate of discharge with 

 a pressure of sixty pounds on the boiler, and delivery against a 



