86 



BOILEB TESTS. 



Boiler No. 8. 



Kind of boiler, 



Number used, 



Horse power (basis 12 square feet ), 



Kind of coal, 



Age, 



. Horizontal tubular. 



. One. 



. One hundred. 



C Anthracite pea and dust 3 parts, 

 . \ George's Creek Cumberland 1 



part. 

 New. 



Boiler No. 8 is a horizontal tubular boiler, provided with a 

 detached furnace, and the general features of the boiler and 

 setting are shown in longitudinal section in the following cut. 

 The furnace has the same location with respect to the tubes as 

 that found in the locomotive type of boiler. The products of 

 combustion pass forward through the tubes, and after return- 

 ing beneath the shell, they enter the chimney from the front 

 end. The boiler is provided with forced draught, which is 

 supplied by a blower discharging air under the grates. The 

 air from the blower first passes through a pipe in the flue 

 space beneath the shell, which presents a heating surface 

 amounting to 15 per cent of the area of that in the boiler. 

 The temperature of the air supplied under the grates when the 

 blower was in operation, was increased by this means about 40 

 degrees. 



BOILER No. 8, LONGITUDINAL SECTION. 



