PROFESSOR KELLAND ON THE THEORY OF WAVES. 543 



have considered the subject with an especial view to the determination of the 

 length of the wave. 



45. The following results are all that I have attempted to obtain ; consequent- 

 ly they may be considered as a fair specimen of the whole. 



The account of the experiments will be found in the Report of the British 

 Association, vol. vi. 



Wave 1. 



/. + 2.=4.50J . ,^^3^^^ 



2e= .5.3 

 and —, — - — r = -78. 



Hence c = ^^^ S^^ ^ [1-. (2.-4.) (.78) , 



.-,.(«.,.{.-£ 5^,} 

 '-{- 



_ (32.2) (3.97) (.9575) . f (.53) (.39) \ 



12 • 1 (3.97) (.9575) / 



7.785 



1- 



(■53) (.39) 

 ■3.97 (.9575) 



_ 7.785 

 .94563 



c= 2.8693 = 



.34853 



therefore, giving in twelve seconds 35 feet instead of 40. 



Wave 27. 



/( = !, 2e=.30 



\ 



31416 

 3.1416 3.1416 



3.1416- (.15) 2.9916 

 = 1.05 

 -1 7.1666 



e a . 



e 



+ 1 9.1666 



2a A 1 



.7818 



Jlo.h 



+ 1 



•i^^i«^)ot§ = -i2^1'^ 



