130 ROYAL SOCIETY OF CANADA 



measuring tanks, or forgetting to record a tanlv full ; both of which will 

 go towai'ds giving the engine a better record. It seems almost impossible 

 that mistakes should be made which will credit the engine with using 

 more water than it really does. As the amount of water used by the 

 engine under the different conditions was one of the most important 

 things to be ascertained, great care was taken to ensure its accurate 

 measurement. Two observers were stationed at the hotwell discharge, 

 one of whom kept the record sheet, whilst the other attended to the 

 weighing machine. Before any observations were made the engine was 

 allowed to run for, at least, half an hour to eiuible it to get into a steady 

 condition. During this time the air })ump was discharging the con- 

 densed feed water into one of the tanks, the bottom cock of which was 

 open, thus alloAving the water to run away. Meanwhile the tare of the 

 other tank had been obtained and its amount placed on the result sheet. 

 When the trial was about to begin, a quarter of a minute's wamiing was 

 given by a sharp blow on a whistle and j,he time for the actual commence- 

 ment of the trial was given by a pi-olonged ring on an electric bell. At 

 this hignal the air pump discharge was switched over into the empty 

 tank, and the time noted down by the man at the sheets. The other 

 observer then put forward the weight on the lever of the scale to measure 

 50 lbs. When this amount had been discharged he signalled to his col- 

 league who noted the time at which it took ])lace. The weight was 

 actually put forward at first to about 40 lbs. ; when the lever commenced 

 to rise warning was given, it was then put to the 50 lb. mark, so that 

 when it again rose the observer was in readiness to note the exact time. 

 At the same moment another observer noted the engine counter reading. 

 The tare of the other tank had been meanwhile obtained and immediately 

 the first one vvas full, the discharge was switched over into it. 



The measurement of the circulating water was conducted by two 

 other observers in much the same way, except that the amount dis- 

 charged and the time were only taken as each tank became full. The 

 men at the tanks also noted the temperatures of the hotwell discharge 

 and circulating water every five minutes. 



One observer was stationed at the revolution counter tln-oughout the 

 trial. At the commencement of the trial he noted down the time and 

 the number registered by the counter. All gauges and tliermometers 

 were read every five minutes and it was the duty of the man at the 

 counter to give a quarter of a minute's warning before the readings were 

 to be taken, by two short blows on a whistle, and the actual time to take 

 them, by two long IjIows. At the same time he himself noted down the 

 reading on the revolution counter. In the majority of the trials when- 

 ever 50 lbs. of feed where discharged he also noted down the reading of 

 the counter as above described. 



Indicator diagrams were taken every 10 minutes, commencing 5 

 minutes after the beginning of the trial. Two indicatoi's were attached 



