1865. J 2^5 [Trippel. 



In consuming 699 lbs. of fuel per hour, we have per second 0.194 

 lbs., ■which produces 80 cubic feet of gas, with a temperature of 2480° 

 Fahrenheit, requiring 10.59 cubic feet of air, reduced to 32° F. 

 temperature for its production, being 636 cubic feet per minute. 



We need further for the combnsfion of 80 cubic feet of gas, 34.3 

 cubic feet of air at 572° Fahrenheit. 



The products of combustion amount to 300.8 cubic feet per 

 second, at the initial temperature of 4928° Fahrenheit. 



The formula for produced volume of combustion : 



V = V (1 + at). 



V ^ expanded volume (300.8). 



V = volume at 0° (27.4 cub. feet). 

 a = expansive coefficient (0.003665). 

 <:= required temperature (2720° Celsius). 



The contact surface between air and gas, which is required for 

 a perfect combustion of the latter, is calculated to 122 square feet. 

 The combustion canal being 3' 8" long, its cross section = 5.3 square 

 feet, and the number of tuyers in the injector being 52, we can ima- 

 gine 52 air cones with 0.098 + 0.328 = 0.213 feet mean diameter, 

 and 3' 8" in length. The 52 cones give consequently a surface of 

 52 (0.213, 3.14, 3.66) = 127.3 square feet, a little more than above 

 calculated. 



The cross section of the fifty-two tuyers in the injector is 

 52 (0.04922.3.14)= 0.39 square feet; the quantity of air at 572° 

 passing through per minute, 60.34.3 = 2058 cubic feet, or reduced 

 to 978 cubic feet, at 32° F. and per minute. 



9Qgg 



The velocity of the air at the tuyers, Y z^^^r^ = 5277 feet per 



minute, or 87 feet per second. 



The head corresponding to this velocity r= 1.5 inch in a water 

 column, or 115.7 feet in an air column. 



The velocity V of the same air, when passing at 32° through two 



978 

 tubes of 8 inches diameter, is ;r-^^ = 1321 feet per minute, or 22 feet 



per second. 



The head just mentioned has, however, to be increased somewhat, 

 for two reasons : 



First. For the suction caused in the gas-flues by the streaming 

 air; and, 



Second. To cause a certain pressure on the air and gas in contact. 



In this case we will be safe to add 10 per cent, of head. 



