﻿Tizahd & Pie. 



Corresponding to experiment A 



Fig. 2. 



Corresponding to experiment A 



In these photographs the lower horizontal line is the line 

 of atmospheric pressure. The ordinates represent pressure, 

 and the abscissae time. A is the beginning of compression, 

 B the point of maximum compression, and C the explosion. 

 The curve in the top left-hand corner is the cooling curve 

 of the products of combustion. 



