Strehlke on the Acoustic Figures of Plates. 301 



is parallel to the side of the square, and divides the ordinates 

 into two equal parts, was at the distance of almost the fourth 

 part of the side from the edge : the equation for A B A was 



y* =: 1-643 . x (x + 5'" -554) ; 

 and for E F E 



y* = L5&3 . x (x + 5"'-591) ; 



and the results of observation and calculation were found to 

 correspond in the following manner : 



For ABA, 



For E F E, 



For C D C the equation was 



y* = 1-676 . x (x + 4"'-662) ; , 

 and for G H G 



1/2 = 0-9213 .x (x + 11"'-034), 

 with the following results : - 



For CDC, 



