BOILER No. 62. 215 



The tests on Boiler No. 62 had for a principal object the 

 the determination of the economy produced by the use of a 

 flue heater. Test No. 126 was made with the flue heater in 

 use, and Test No. 127 with the heater shut off, and the gases 

 passing to the chimney through the direct flue. The use of 

 this apparatus secured a reduction of 104 degrees in the tem- 

 perature of the waste gases, or 135 degrees, when referred to 

 the temperature obtained on Test No. 127. The heater in- 

 creased the temperature of the water 58 degrees, the initial 

 temperature being 111 degrees. The water evaporated per 

 pound of coal was increased by using the heater from 6.89 to 

 7.53, or 0.64 pounds, and this represents a gain of 9.3 per 

 cent. When the same heater was supplied with water at 200 

 degrees, the flue gases entering at 380 degrees, the tempera- 

 ture of the water was raised 25 degrees. Looking at the 

 general results of Test No. 127, it appears to be little better 

 than that obtained on the plain cylinder boiler, Test No. 94, 

 in which the temperature of the waste gases was higher to the 

 extent of 133 degrees. It appears that the temperature of the 

 gases, which was 434 degrees on Test No. 127, does not 

 represent the true loss at the chimney, owing to the leakage of 

 a large amount of air into the furnace. As an. indication of the 

 extent to which this leakage occurred, it may be said that the 

 draught suction in the main flue, amounting to 0.65 of an inch 

 water pressure, was reduced to 0.34 of an inch in the furnace 

 of one of these boilers, with the fire-doors and ash-pit doors 

 tightly closed and the damper wide open. Had there been no 

 leakage, the full suction of the main flue would, under these 

 circumstances, have been secured at the furnace. 



Boiler No. 63. 



Kind of boiler, Cast-iron sectional. 



Number used, . Two. 



Horse-power ( collective, basis 12 square feet ), . One hundred and forty. 



Kind of coal, Bituminous Cambria. 



Age, Fifteen years. 



Boiler No. 63 embraces a plant of two sectional boilers set 

 in one battery of brick work. The general form of the boilers 



