50 



THE LINEAR COMPRESSIBILITY OF COPPER AND IRON, 



In the following tables each numbered determination is given with each 

 of its two parts separate one in which the pressure was increased and 

 one in which the pressure was decreased. 



Data concerning the compressibility of iron. 



[Actual length of iron rod 2.67 meters; corrected length of iron 

 rod = 2. 74 meters; 1 division of micrometer = 0.00625 mm.] 



Total average /3 Fe = 0.000000385 + 0.000000005. 

 Data concerning the compressibility of copper. 



[Actual length of copper rod = 2.69 meters: corrected length of 

 copper rod = 2.74 meters: 1 division of micrometer = 0.00625 mm. 



Total average /3 Cu 0.00000051 0.00000004. 



It will be noted that the values for the compressibility of iron, 

 0.000000385, and of copper, 0.00000051, differ considerably from the val- 

 ues found by Amagat, respectively, 0.00000068 and 0.00000086.* The 



*Loc. cit. 



