Manchester Memoirs, Vol. xlii. ( 1 898), No. 0. 43 



VI. When 62 minutes had elapsed, the counter was 

 disengaged from the shaft, and at the same time the 

 stream of water was again diverted to waste. The drain 

 pipes from the stuffing-box and regulating cock were 

 removed from their respective vessels. Readings were 

 taken of the speed indicator and of the temperature of 

 discharge. 



VII. Fresh observations were made of: — 

 {a) the reading of the revolution counter, 



{b) the weight of the tank and water received during 

 the trial, to which had been added the water 

 caught from the regulating cock. 



A record was also made of : — 



(c) the weight of water which had been caught at the 

 stuffing-box. 



5. TJie observations were then reduced as follows : 



Let Ti = mean temperature of water supplied to the brake, 

 T2 = „ „ discharged from „ 



Wi = weight of tank and contents before the trial, 

 W2= „ „ „ after 



w = weight of water caught from stuffing-box, 

 t = rise of reading of the thermometer in the dis- 

 charge pipe during the trial, 

 T = mean temperature of the stuffing-box cover, 

 Tg = „ „ „ lower brass of the main 



bearing, 

 T^ = mean temperature of the air, 

 Ni = reading of revolution counter before the trial, 

 N2 = „ „ „ after „ 



M = moment in ft.-lbs. carried by the brake. 



Therefore we have for the total heat generated 



H = (W2 - Wi)(T2 - Ti) + w{T, - Ti) 4- t.x 

 + (T«-T3)C + (T2-T,)R. 



