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THE 
“LONDON, EDINBURGH, ann DUBLIN 
PHILOSOPHICAL MAGAZINE 
AND 
JOURNAL OF SCIE 
——————a>____ 


[SIXTH SERIES.] 
MAY 1904. 
LIV. The Electric Origin of Rigidity and Con 
By Wit11amM SUTHERLAND *. 
i “A Kinetic Theory of Solids” (Phil. Mag. [5] xxxii.) 
it was stated that a certain formula almost demonstrated 
the kinetic origin of rigidity. This formula for the rigidity 
n of a metal of melting-point T at temperature @, the rigidity 
at absolute zero being N, was 
ee ee tt ema 
Further inquiry on the lines of ‘The Electric Origin of 
Molecular Attraction” (Phil. Mag. [6] iv.) has led me to 
amend the above statement to the following form :—The 
variation of rigidity with temperature is a simple kinetic 
phenomenon. It will now be shown that rigidity at absolute 
zero is a purely electrostatic affair, and certain immediate 
consequences of this fact will be worked out according to the 
following table of contents :— 
1. The Electric Origin of Rigidity. 
2. The consequent nature of Atomic Vibration. 
3. The division of Molecular Electric Energy into Blec- 
trostatic and Electrokinetic as shown by the temperature 
variation of rigidity in metals. 
4, The Electric Gyrostatic Property in Molecules and its 
part in Metallic Conduction. Theory of Electric and Thermal 
Conductivity in Metals. 
* Communicated by the Author. 
Phil. Mag. 8. 6. Vol. 7. No. 41. May 1904. 2G 
