1863.] 



465 



expansion of 1 75 inch occurred upon the water-line, and of 1 15 inch 

 upon the lower edge. 



Experiment 14. The hollow wrought-iron cylinder was heated to 

 redness and cooled by half-immersion on its side, instead of on its 

 end as in other experiments, twenty times. 



The effect was a very complicated one (see figs. 17, 18, and 1 9) ; 

 the dotted lines show the original form. 



Fig. 18. (Side view of fig. 1 7.) 



Fig. 19. (Front view of fig. 1 7.) 



The three figures are one-sixth of full size. 



