(119) 
in surmounting the mechanical friction, what part for the production 
of electric currents. 
Let the total quantity of heat developed in a complete up and 
down motion of the meniscus by the sudden application and annulling 
of a given P. D. be 4, the heat produced by mechanical friction 
Aj, by electric currents A», then 
De PE vn SE a Hd 
Let the initial velocity of the meniscus after the application of 
the given P. D. be vo, then is 
Formula (3) reading 
becomes for y = 0 
A, varies directly as v, hence with a given value y*, also as 
0 
1 
a + bw’ 
Therefore we write 
ME eat DEEN RT Rae ome er 
¢ being a constant. 
For w=0 the heat produced by mechanical friction becomes 
equal to the total work. The last remains the same for every value 
of w, hence we may put 
DE bete Se OES SRA een rere (0) 
From the formulae (5) and (6) follows 
A a 
Ze en . . . . . . . . (7) 
A a + bw 
Proceedings Royal Acad. Amsterdam, Vol. IL. 
