THE ROYAL ARTILLERY INSTITUTION. 
311 
Fig. 18. (Side view of fig. 17). Fig. 19- (Front view of fig. 17). 
Figs. 18 and 19 are one-sixth of full size. 
Experiment 15. A solid wrought-iron cylinder was heated to redness 
and cooled by half-immersion on its side twenty times. 
The effect was of a similar nature to that of the last experiment (see figs. 
20 and 21). 
Figs. 20 and 21 are one-half of full size. The dotted line indicates original figure. 
Experiment 16. A hollow cast-iron 
cylinder, the dimensions of which were 
the same as those of the deep cylinder of 
Experiment 14, was heated to redness and 
cooled twice by half-immersion. 
At the second cooling it fractured 
nearly all round, about an inch below 
the water-line. It expanded all over, but 
the expansion was least about an inch 
above the water-line, i.e. it did not con¬ 
tract to its original dimensions. 
[VOL. III.] 
Fig. 21. 
