OTHER PROPERTIES OF CAST IRON. 175 
The deflection was ascertained every time the 
weights were increased ; and, in order to discover 
the defects of elasticity, the set was taken at 
equal intervals between the weights during the 
progress of the experiments. Considerable 
attention was also paid to observed discrepancies 
appertaining to the point at which the elasticity 
became defective. 
The following sketch of the apparatus shows 
in what manner the experiments were con- 
ducted :— 
A B represents a straight edge or parallel 
guage, having two dovetailed slides CC, to 
regulate the height above the bar D D, 
resting upon the supports E E, and F the 
scale on which the weights were laid. The 
