366 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



range. The results obtained were not quite so regular as the former 

 results, doubtless because it was impossible to place the cylinder in a 

 position so favorable to the entire removal of all particles of grit after 

 every application of pressure. In this work the cylinder was placed 



5000 10000 



PRESSURE, KGM/CM^ 



Figure 2. Shows the change of length at two temperatures of a bar of 

 bessemcr steel 29.95 cm. long under uniform hydrostatic pressure. The zero 

 reading for each of these temperatures is arbitrary. 



vertically in a thermostat, whereas in the former work it was placed 

 horizontally. 



The results are shown in Figure 2. The values found for the com- 

 pressibility were O.OgSSS at 10° and 0.0g601 at 50°. The result of 

 the previous determination in the tool steel cylinder at 20° 



was 



