42 Reynolds and Moorby, Equivalent of Heat. 



of temperature between the brake and the adjacent shaft- 

 bearing. These adjustments took from a quarter to half 

 an hour, and, when completed, the engine was allowed to 

 run for some half-hour longer to ensure a steady condition 

 being attained. The condensing water had also, in the 

 meantime, been adjusted till the water issuing from the 

 discharge pipe had the required temperature. 



III. Readings were then taken of : — 

 {a) the revolution counter, 



iU) the weight of the empty tank and its cover. 



IV. When a steady condition was reached, on a 

 signal being given, the connection of the revolution 

 counter with the engine shaft was made simultaneously 

 with the pulling over, by a system of links, of the two-way 

 tipping switch, and the stream of water which had hitherto 

 been flowing to waste was thus diverted into the tank. 



The vessels used to catch the leakage from the stuffing- 

 box and regulating cock were placed under their res- 

 pective drain pipes. 



The speed of the engine, as indicated by the gauge, 

 was read on the signal being given, and as soon as 

 possible afterwards an observation was made of the tem- 

 perature in the discharge pipe. 



V. At intervals of 2 minutes, 30 observations were 

 then taken of the temperatures of supply and discharge of 

 the water to and from the brake, and also at each of these 

 intervals a note was made of the indication of the speed 

 gauge. 



At intervals of 4 minutes, 15 observations were made 

 of the thermometer registering the temperature of the 

 room ; and at intervals of 8 minutes readings were taken 

 of the two thermometers in the stuffing-box and on the 

 main bearing. 



