ON SOME FORMAL ANALOGIES 
BETWEEN 
THE PARTIAL DIFFERENTIAL EQUATIONS 
Expressive of the strains in a circular elastic plate under certain distri¬ 
butions of load, and the equations which give the magnetic force in 
a cylindrical iron core under the influence of electrical current; 
together with some other formal electric and elastic analogies. 
BY 
JOHN EL D A V 1ES, 
Professor of Mathematical Physics in the University of Wisconsin. 
