ON THE SONIFEROUS VIBRATIONS OF THE GASSES. 



\65 



(timlre) resembled the sound produced by a bad-toned bag- 

 pipe. The pitch was a little naore than a major third below 

 that/of atmospheric air : our preceding experiments with an 

 open pipe and less accurate apparatus gave 3d. — comma. 



1 . Nitrous oxide 



2. - - - . 



3. - - - - 



4. - - - - 



67 



■07 



8-]7 



67 



•11 



15-52 



67 



•20 



23 02 



67 



•25 



2977 



•27350 

 •28000 

 •28550 



•286/5 



We thought the acid in the receiver was become a little 

 more opaque, but no froth appeared on its surface, as it had in 

 some of the experiments. On opening the stop-cock in the 

 transfer-plate, and working the pump, the sound of the pipe 

 became more acute, like the sound of a violin-string, which is 

 slowly shortened by sliding the finger. 



2. Carlon'ic acid, disengaged from chalk by dilute sulphuric Expt. 2; 

 acid, and collected over vi'ater. The tone of this gas was weak 

 and reedy*. 



1. Carbonic acid 



2. - - - - 



3. - - - - 



Atmos. air - 



61-5 



•30 



•12 

 •34 



10-23 I ^2740 

 14^25 -2772 

 2596 I -2850 

 2880 -2850 



3. This gas remaining in the receiver, the pump was worked ^^P- ** 

 till the pressure on the gauge was 14-34, when a quantity of and'^hidroeeij 

 hidrogen gas was added. The sound became more acute with 

 a slide, and clearer and smoother than the sound of carbonic 

 acid alone. 



Carbonic acid 

 Hidrogen added - 

 Do. remained - 



61-5 





14-34 

 28-80 





.65 



28J5 



•27§0 

 •2115 

 -2125 



The pitch of these gasses was not altered by working the pump 

 till the pressure v^as 14 46 ; but on filling up the receiver with 

 atmospheric air, the sound was depressed to -2215, and the 

 gauge rose 0'30 in a very short time. 



' * Chladni found the pitch of this gas to be almost a major Sd below 

 that of atmospheric air, a result which accords vfith this experiment. 



4. Chlo' 



