MINUTES OF PROCEEDINGS OF 
312 
Experiment 17. A solid cast-iron cylinder, 3 inches in diameter and 
6 inches deep, was heated and cooled five times by half-immersion. 
At the fifth cooling it cracked across the bottom; it also expanded 
throughout, and the expansion was least a little above the water-line, i.e. it 
did not contract to its original dimensions. 
The subjoined figures (half the full size) show the changes produced on 
the 9-inch cylinders after every five heatings. (Experiments 2 and 4). 
Eig. 22. 
Eig. 23. 
12" cylinder, 9" high, thick. 
Vide fig. 4. Cooled by ^-immersion. 
12" cylinder, 9" high, thick. 
Vide fig. 7. Cooled by f-immersion. 
Nos. 1. External surfaces, original forms. 
2. „ „ after 5 coolings. 
3. „ „ „ 10 „ 
4. „ „ „ 15 
6 . „ „ „ 20 „ 
