(i 1 6 



Prof. L. T. More on Dielectric 



We append a sample curve drawn with the help of these 

 tables. 



FORCE 



no 



100 

 90 

 80 





























y 



/ 



\ 











\ 







/ 







\^ 











60 







_____^-^'^ 







50 

 40 























30 

 20 

 10 

































4 

 -PLATE 



R 



The case of e = - — ^- gives tanh<w = at the negative 



plate, while the value at the positive is determined by a 

 transcendental equation. 



LXXV. On Dielectric Strain along the Lines of Force. By 

 Louis T. More, Ph.D., Professor of Physics in the 

 University of Cincinnati *. 



ALTHOUGH I have reviewed in former papers the work 

 accomplished in electrostriction, yet, as the stress- 

 problem is undoubtedly the fundamental one in the theory of 

 electricity, I may be permitted to summarize briefly what 

 has been done in this branch of the stress-problem before 

 describing any new experiments. 



By electrostriction is meant the strain in dielectrics and 

 their consequent mechanical deformation, produced by the 

 action of electricity in them. The effect is supposed to occur 

 in solid, liquid, and gaseous non-conductors when they are 

 electrified. The first observations date back to the beginning 

 of the last century. In its early stages, electrostriction was 

 looked upon as an isolated property of electricity, and although 

 laws were formulated, it was not until Faraday and Maxwell 

 adduced the effect as one of the fundamental phenomena on 

 which to build their new theory of setherial stresses, that any 



* Communicated by the Author. Read in part before the International 

 Electrical Congress, St. Louis, 1904 ; and in part before the American 

 Physical Society, March 1905. 



