■264 



APPENDIX. 

 Table III. 



Pitch of Reed = 2.5. 



Length of tube at successive! 

 (loublini; points as tlie pipe f 

 was lenctheued. ' 



4.75 



13.8 



23.1 



32.15 



41.45 



50.85 



59-9 



I have stated that the cycles of phenomena recur at distances 

 equal to the sonorous wave of the reed. I must remark, however, that 

 this distance is always somewhat greater than it ought to be, if calculated 

 from the length of the pitch-pipe corrected by Bernouillis's Table. (Biot. 

 Phi/s. II. 135. 3Iem. Acad. Par. 1762.) The difference is about an eighth 

 or tenth of the wave. Thus, 



Reed, Tab. II. by a mean of the different) 



distances gives the half wave j 



But pitch = 6.6, and this corrected = 7.2 . 



DifF. = 1.6 



Reed, Tab. III. gives half wave. 

 Pitch =2.5, and corrected 



4.65 

 3.4 



DifF. = 1.25 



Reed, Tab. IV half wave = 3.2 



Pitch = octave above 4.2 



Corrected = 4.95, .-. true pitch = 2.475 



DifF. = .725 



