T84NSIT ADJUSTMENT, 5S 



excellent papers of Mr. Gough, at page 66 and ] 60 of vol. X. 

 of the prefent Oiftavo Series, concerning the augmentation of 

 founds, and the fpeaking trumpet have added coniiderably to 

 our knowledge of this fubjeQ. The memoir of Haflenfratz on 

 the fame inftrument in our Ninth Volume, p. 283, and ano-' 

 ther, by the fame author, on the Propagation of Sound, at 

 Vol. XI. p. 127, alfo deferve to be confulted. from the 

 whole confideration of the f'aQs it feems as if the fonorous 

 vibration of the inflrument were of much more confequence 

 than has hitherto been fufpecied ; and it feems not impro- 

 bable, that a large furface expofed to the aerial pulfes of 

 iound, and having a tail of communication to be applied to 

 the teeth, or inferted in the ear, might have considerable 

 effeft. The ufe of the external ear, which has excited fo 

 much difcuffion, may, perhaps, be of this kind. The expe- 

 riment of Dr. Moyes (Philos. Journal, III. 57) of conveying 

 found to great diftance through a firing may be added to the 

 other faQsi and tends to fliew that the fonorous undulation 

 4oes not require to be tranfmitted through fuch bodies as are 

 the moft denfe, uniform, and elaftic. Leather, or felt, or 

 pafteboard, or various other fimilar materials, are more fre, y-j^ 



qdiently obferved to tremble in the hand at certain particular 

 founds than many other denfe bodies. 



XII, 



Bajy and CorreSt Method of verifying the Portion of a Tranfit 

 Jnjirument, Bj/ J, S, Bcxx, ^fq. Communicated by the 

 Author, 



To Mr. NICHOLSON. 

 SIR, Paragon, J>ecemher 8, 1805. 



jfjL SHORT note having appeared in Mr. Kelly's new edition introduftory 

 of Spherics, defcribing my method of verifying thepoiition of note, 

 a tranfit inflrument, and thinking an account more in detail 

 may not be unacceptable to your agronomical readers, I am 

 induced to trouble you with it, that you may, if you pleafe 

 infer it ip your valuable Journal- 



Your's refpefilfuily, 



JAMES STRODE BUTT. 



TO 



