Strehlke on the Acoustic Figures of Plates. 299 



0-263 and 0326, (the side of the plate being 1-000,) D D' was 

 25"'-2 and 26"'6, the curves had the form of fig. 5, C and C' 

 being beyond the plate. 



Fig. 5 



Fig. 7. 



Fig. 8, 



The curve D C D' E' was also measured and calculated on the 

 brass plate No. 1. The co-ordinates on C C' were measured, 

 and for the eurve A C B the fourth part of D C D' C', the 

 equation was found to be 



2/* = 0-4663 .x.(x + 25"'-829), 



and the results of observation and calculation agreed in the 

 following manner : 



For A' C' B' the equation was 



y = 0-4434 .x.(x + 26"'-777), 

 with the following result of observation and calculation,- 



