OF THE IRK, LOCOMOTIVE ENGINE. 525 
from which .2= »D ) com. log. = 
re ) renga 
By substitution, we have 
ae ves 
A D = (1447) nearly ; 
-00375 
& a com. log. Dy, 
p= 20 A nearly. 
-4342 
: Bye jie D 
From these equations it is found, that = 
=16.34 nearly; and, that the pressure of the 
steam, in the boiler, at the time of the explosion 
was nearly 245 pounds on the square inch, the 
pressure of the atmosphere being neglected. 
If, in Art. 10, the pressure of the atmosphere, and the 
—pt 
term Ges, had not been neglected, the value of 9, in Art. 14, 
- 
would have been 
—yt 
vD 1 é pa e - 3 
fi ye es ei +: by which, the operation 
would have been rendered very laborious. 
Owing to the many assumptions, which have 
4A 
