Report of Superintendent. . QS 



of the engines, and a system of double steam pipes was so arranged, 

 that by adjusting the stop valves, either engine could be made to 

 take steanf from either boiler, while the other engines, steam pumps, 

 tfec, were supplied with steam from a common pipe connected to 

 the other boilers. Flange unions were provided at each valve in the 

 test pipe, so that blank flanges could be inserted when the actual 

 trial took place, and thus prevent any question in regard to leakage 

 of the valves. 



Arrangements were made with the inventor of Neer's rotary 

 dynamometer to place his instruments on the shafting to measure 

 the useful work done. 



The proper place for a dynamometer was upon the hub of the 

 pulley which received the power direct from the engine, but the 

 shafting opposite the engines was too large for any instrument then 

 on hand, besides which it would have required a great deal of time 

 to shift the machine from the receiving pulley of one engine to that 

 of another. It was finally concluded to put up three dynamometers, 

 two on the east shaft, at the ends of that portion of which extended 

 in front of the engines, and the third on the driving pulley of the 

 west shaft, which measured the work driven from that, and the third 

 shaft in the other building. The result was very satisfactory. The 

 power instead of being expanded in friction by the use of a large 

 friction dynamometer, as would have been necessary some years ago, 

 was transmitted and at the same time measured by the instruments 

 used, and thus the trials and the exhibition were kept up together 

 without interference. 



The Harrison boiler proved tight on examination, and was for 

 that reason selected to furnish steam for the experiments, and a 

 Worthington meter was obtained and attached to the suction pipe 

 of the pump feeding that boiler. The object of using a water meter 

 was to positively prevent any tampering with the water measurement 

 during the excitement of a trial. 



The use of tanks would have required extra attention, and the 

 frequent operation of a number of valves, liable to leakage and 

 unauthorized interference. 



As directed by you, a letter was posted in the engine room, 

 addressed to the exhibitors, asking them to closely watch the trials, 

 and stating that the instruments were so arranged that any person 

 could keep his own record, and readily determine the results. (See 

 exhibit F.) 



