Ilfi 



TRAK3MISS10N OF SODND THROUGH LONO TUBES* 



mlssiou of sound. For Mr. Martin and me, at the distanc« 



of 951 m. [1040 yds.], this time was about 5*58." 



CttaTtpand We also uscertained anew, that grave and acute sounds 



acmesounfls are transmitted with equal velocity, which is agreeable to 



ff ci y.**"^ theory, and has been several times observed. Tunes on the 



■ig on the flute, played at one extremity of the pipe, were transmitted 



{=• 



to the other without any alteration in the intervals of th6 

 different intonations. It appeared to me only, that th* 

 very high notes were not heard so? well as the low notes ; 

 and sometimes, when they were ext^etn^Iy hig'h, I Post them 

 entirely; though I heard others that were" lower, which, 

 from the nature of the tune, I knew to be weaker than the 

 former*. 

 :pchooftlie 1 also observed, that, in speaking through the pip^, I 



^""•an^dl'^to l'^'""'^' ™y <^'^"' voice repeated by several echoes, which sncJ- 

 ^^^a^jcakcr, ceeded each other at exactly equal intervals. !n our last 

 fexperiwient 1 cb-wnted no less than six, about 0*5" dis- 

 tant fron. each other. The last returned after a little less 

 than 3"; that is, in the time requisite for the transmission 

 of the sound to the other end of the pipe. These pheno- 

 Inena occurred equally at each extremity of the pipe, whett 

 we spoke into it. Of this l satisfied myself by requesting 

 Mr. Martin, through the pipe, to observe them, without 

 communicating to him my re&ults: and his, which he re- 

 spited to me immediately in the same way, were perfectly 

 V ;-.'--.: ir ; • sjnvilar. The number of echoes and their intervals were 

 « ibe'otber ^'^^ same, and the total of the time was the same also; but 

 ??£* single the person who is spoken to never hears but one sound. 

 p^etopations. Lastly, detonations capable of producing a considerable 



agitation in the air wer« transmitted to the other end of the 

 A pistol fired pipe vith an intensity proportional to their strength. Re- 

 blewoiua ports of a pistol fired at one end octasioned a considerable 

 vaiidle at ilie explosion at the other. The air was driven out of the pipe 



* Since this paper was read, i have found, that tlie person who played 

 the flute, haTlng very weak hmg^, could ■•.vith diiTiLulty bring out th^ high 

 notes, and was frequentiy obr!!»cd t> skip them entirely. It was very 

 natural therefore, that I should not hear them: but I have thought pro- 

 per to let my fir^t account remain, tliat the reader may see I reported 

 faithfully the Kmallest particular" ^ and that niy voracity in this circum- 

 ' stance tr.ay ronfirin th.e other results I observed. 



with 



