3*4 



On the Compressibility of Solids 



TABLE V. Aluminium. Date, Jan. n, 1904. Temperature, 9 C. 

 Wire No. 20 S.W.G. Length, 75-35 inches. 



TABLE VI. Magnesium. Date, Jan. 17, 1904. Temperature, 9 C. 

 Wire No. 22 S.W.G. Length, 75-2 inches. 



which its apparent cubic compressibility was found to be 1-5 

 per million per atmosphere. The piezometers which were used 

 for this purpose were made by myself on board. The divided 

 stems were of lead glass, because I had no other, and the bulbs 

 or reservoirs, which had a capacity of about 20 c.c., were made 

 of German glass, for the same reason. I have, therefore, 

 applied to the values then found for the apparent compressi- 

 bility of mercury, the value of the absolute compressibility of 



