1883.] communication on " Critical Equilibrium!' 



and therefore, supposing c small, so that \mB 2 — \c is positive, 



K 2 Jc' 2 q 



and -p- = (|?w/3 2 - c) |- 2 



or -^ = (mB 2 - c) -| ; 



and then 2 T 7 is the time of a vibration. 



If c = 0, then -^ = 1, k' 2 = V = \ = sin 2 45°, 



= /3cnZ ^, 



. & 2 ?H(7/3 2 



where ^r 2 = -— - 



B*J(mg)' 

 where A^= 1-85407. 



Again, in the solution of 



d * d - ,,& 



integrating (^j = $/* (B e - n ), 



B 2 



and 



1+y 2 



1 + cn/T^ 



= /3 2 i -. 



1—2 



