Friction affects the Motions of Tirne-Ke^pcrii. 139 



The value ^ = ^ corresponds to a — f = A — <p, while 

 e = — ^ corresponds to a — (p = — A + <P; whence the entire 

 time of the first oscillation is 



'='V-— ji+r^) ('""V) + (2:4) («^"-2— ) +etc} . 



