29 



quantity of small coal or breeze required to raise the 

 temperature of the water to 125 degs. is 28 pounds. 

 In twelve hours the water cools, after the fire has 

 been extinguished, from 125 to 93 degs. 



When steam is employed, the space for steam in 

 the boiler is easily found by multiplying the length 

 of the pipe in feet, by the quantity of steam in a foot 

 in length of the pipe. 



Interior diameter Decimal parts 



of pipe of a cubic foot of steam 



in inches. in each foot of pipe. 



1 0.0545 

 H . 0.1225 



2 0.2185 

 2\ . 0.34 



3 0.49 



4 0.873 



5 1.063 



6 1.964 



7 2.67 



8 3.49 



9 4.42 



10 ... 5.45 



In the above noticed house, the length of pipe five 

 inches in diameter is 150 feet ; and these multiplied 

 by 1 .363=20.5 cubic feet of steam, and as the pipe 

 will condense the steam of about one cubic foot and 

 one third of water per hour, therefore the boiler 

 should be capable of evaporating 1^ cubic feet of 

 water per hour, to allow for unavoidable loss. In the 

 extreme case of the thermometer being at zero, the 

 consumption of coals to keep up this evaporation will 

 be 1 2f pounds per hour. 



