ON THE PROPERTIES OF CAST IRON. 

 Weight on bar 392 lbs. 



91 



With a load of 392 lbs. we have a slow but steady increase of the deflec- 

 tions, being for four years only -004 for the cold blast and -009 for the hot 

 blast, which shows a ratio of increase in the hot blast of 1000 : 2250. In other 

 respects the bars continue to maintain their position with little or no variation. 



Table III. 



Table of deflections, as exhibited with permanent weights of 448 lbs., sus- 

 pended from the centre of bars of cold and hot blast Coed- Talon iron, 

 cast to be one inch square, and left to determine the effect produced on 

 each bar after given intervals of time. 



Distance between supports 4 ft. 6 in. 



