462 



[March 5, 



Experiment 9. A solid cast-steel cylinder, of the same dimensions 

 as that used in Experiment 5, was heated and cooled by half-immer- 

 sion twenty times. 



The effect obtained was similar to that produced upon the solid 

 wrought>iron cylinders, but the breaking up of the structure was dif- 

 ferent (see fig. 1 3) . The greatest contraction was slightly above the 



Fig. 13. 



Fig. 14. (Top of fig. 13.) 



Fig. 15. (Bottom of fig. 13.) 



One-half of full size. The dotted lines indicate the original figure. 



water-line, and amounted to *38 inch ; the bulgings on the ends were 

 075 inch, being much less than on the wrought-iron cylinders. 



point it weighed 50 Ibs. T125 oz., or 2'625 ozs. heavier than it was at the com- 

 mencement ; from the tenth to the fifteenth heating the accumulated scales peeled 

 off, and the weight was gradually reduced to that stated above. 



That which was cooled in water weighed 50 Ibs. 12-5 ozs. before the experiment, 

 and 48 Ibs. 14'5 ozs. at its conclusion, giving a loss of 1 Ib. 14 ozs., which was 

 due to the action of the water peeling off the scale each time the cylinder was 

 cooled. 



