CHANGE OF VOLUME AND OF LENGTH. 



59 



that it rested in the nxial line, and never came in contact with 

 the wall of the tube. The magnetizing coil and the tube were 

 placed in a horizontal position. The motion of the meniscus 

 Avas measured by a microscope provided with a micrometer ocular. 

 For more minutely detailed particulars, we must refer the reader 

 to the former paper. 



3. The followins: are the dimensions of ovoids used in the 

 present experiments : 



a gives the semi-minor axis, c the semi-major axis, v the volume, 

 f> the density, and iY the demagnetizing factor of the ovoids. The 

 volume of each specimen was measured by weighing the ovoids 

 in water. 



The elastic constants of the metals were measured by flexure 

 and torsion experiments on rectangular prisms made from the 

 same specimens as the ovoids. The prisms were 14.6 cm. long 

 and 0.896 cm. square in cross-section. 



