Strehlke on the Acoustic Figures of Plates. 295 



and the relation between the observed and calculated values 

 of y was 



So that the results of calculation and observation may almost 

 be considered to accord. 



The calculated distance between the summits of the curve, 

 = G'"-27, was also found to agree with observation, it being in 

 three different experiments, 6"'-25 6"'-26, and G'"-24. 



The plate was now ground, in order to see what change this 

 would produce in the situation of the curve. The following 

 equation was obtained : 



2/ 2 = 1-1032 .#.(& + 6"'-228) ; 

 and the difference between measurement and calculation was, 



so that scarcely any alteration had been produced in the 

 curves. 



Both branches of the hyperbola appeared to be equal ; this 

 was however only apparent, for when it was taken as the origin 

 of the co-ordinates, it was found that 



y = 1-1G27 .*.(* + 5"'-379), 

 and the unit of measurement and calculation to be 

 VOL. II. Nov. 1831. X 



