290 Prof. J. J. Muller on a Mechanical Principle 



When the same values are also introduced. into the force-function 



U=-^(l-J), 



there results, after a similar reduction, 



and inserting, finally, both these values in the primary function 

 -V= T(T-U)^, 



v'O 



we obtain 



or, if by aid of the first of the integral equations we put 



iVJi(d-e )cos\/ft 



Po = 



sinA/^ 



and, lastly, introduce again into the trigonometrical functions the 

 simple variables, 



- V=gK+i(e*+0$k/tfwi\/2 1- eB « W .l l . (11) 



V l sin^A* 



Referred to the same variables / and 6, we have on the other 

 hand 



— — 1 9 0' 

 1 dW 



L ~ ziAdo ) ' 



If this, together with the value of U, be inserted in the known 

 differential equation for A, 



T=-U + E, 



