( 480 



Explanation of Symbols used in the Following Tables. 



V = volume of material of tube. "\ 



v = „ bore „ I . A11 ex P ressed 



I in cubic centimetres, 

 v = ,, bar of same length and breadth as tube. / 



SV, Si', Bv' = the measured changes of the volumes; unit, 10" e cub. cm. 



S = SV/ V = cubical dilatation. "\ 

 X = elongation parallel to axis of tube. All expressed 



m, m ; = tangential elongations at inner and outer surfaces, f in millionths, 10" R . 



v, v' = radial „ „ „ ! 



The value of the magnetic field in every case is the value at the centre of the 

 magnetizing coil and is expressed in C.G.S. magnetic units. 



! 



