On the Tones produced by an Organ-pipe^ &c. 27^ 



I flatter myfelf that the fimplicity of the conftrLiftion of 

 this inftrument, the facihty with which it may be made at 

 a very fmal! expence, and the certainty that two inftruments, 

 prepared according to the fame fcale, with a like quantity of 

 ix)ated glafs, muft exaftly correfpond with each other ; but, 

 above all, that the certainty and accuracy by which experi- 

 ments may be made with it,* and by thefe means be accu- 

 rately defcribed, are advantages which will not be found 

 united in any of the electrometers hitherto invented. 



X. Ohfcrvations on the Tones produced ly an Organ-pipe 

 in dijferent Kinds of Gas. By C. F. F. Chladxi *, 



A 



IR, it is well known, is the moft common condu6lor 

 of found ; but it can become a fonorous body alfo. The 

 latter is the cafe in regard to a pipe, as the pipe itfelf does 

 not emit found, but the column of air included in it, and 

 which, being fcparated from the reft of the atmofphere, is 

 obliged, by blowing, to vibrate in fuch a manner that it con- 

 trails and expands longitudinally in various v.avs ; and thefe 

 vibrations are then conduced to a diftance by the furround- 

 ing air. It is not neceflary that I fliould here farther ex- 

 plain the different kinds of vibration of which the air in a 

 pipe is fufocptible. Thofe who are defirous of information 

 on this fubjeft may confult Daniel Bernoulli's papers in the 

 Memoirs of the Academy of Paris for 1762; thofe of Lam- 

 bert, in the Memoirs of the Academy of Berlin for 1775; 

 and of Eulcr, in the Sixteenth Volume of the New Tranfac- 

 tions of the Imperial Academy of Peterfburgh. 



The conducing of found through the air, and the vibra- 

 tions of air in a pipe, depend on the fame laws. This will 

 readily appear from the following obfer\'ation, bcGdes others, 

 thai the velocity of tlie vibrations, under like circumftances, 



• From AwV/'j Magazin fiir den nevejien xujiund tier l^aturktinde, 

 V*o].J. ^ivi 3. 



T i depends 



