274 Dr. Moll on the [Oct. 



Easperiments on the Velocity of Sound, made the 21th June, 1823. 



Thus, taking the mean of all the observations, we have the 

 velocity with which sound travelled along our basis free of the 

 accelerating or retarding effect of wind, on the 27th of June, 

 1823, equal to 5r',96. And as the basis was equal to 17669,28 

 metres, or 9664,7044 fathoms, we have the velocity of sound, 

 found by experiment as above, equal to 340,06 metres, or 

 1 116,032 English feet per second. 



Now, whilst these 22 shots were fired, the mean temperature 

 of the air wfts 



At Zcvenboompjes = 11°,21"] 

 Kooltjesberg =11 11 I 



>0f centrigade scale. 



Mean temperature \ ii ig _ / 

 on both stations J J ~ 



