and the Observed Velocity of Sound in Air and Gases. 21 



The results of these calculations are presented in the annexed 

 Table. 



1738. 



1821. 



» 



1822. 



1822. 

 1823. 



Experimenters. 



Cassini, &c Cannon 



Goldingham* 



Sources of 

 sound. 



1824] 

 and I 

 1S25 J 



Aragof. 



Myrbach 



Moll, Van Beek, &c. 



Gregorys 



Parry and Foster § ... 



1844. Bravais. 



Cannon 



Cannon 



Distances in 

 metres. 



Muskets . 

 Cannon . 

 Bells .... 

 Muskets . 

 Cannon . 

 Howitzers 

 Mortars . 

 Cannon 

 Mortars 

 Muskets 

 Cannon 



} 



:::} 

 :::} 



Cannon 



2852609955 



90057628 

 4246-4883 



18612-51983 



9940-87 

 17669-28 



1097260 

 2438-360 

 1005-821 

 1097-260 

 1996-400 



944-863 

 4102-538 



2688-286 



3929-6818 



Mean 

 temp. Cent 



625 



28-861 

 26-278 



15-90 

 1775 



Observed 



velocity in 



metres. 



11095 



10-898 



- 2-78 



4- 0-56 



1-67 



722 



1500 



15-56 

 17-78 



18-89 



-21-67 



-22-77 

 -31-39 



-27-77 

 -38-61 

 -39-16 

 -29-72 

 + 0-83 



337-187 



350-2552 

 344-8784 



340-8886 

 344-5167 



Velocitv at 



0° Cent, in 



metres. 



333-3851 



3330602 

 329-3621 



elocity in 

 dry air at 

 0° Cent . 



331-875 



331-3580 

 3338154 



340-2558 

 339-3722 



333-506 

 335 020 

 335-884 

 337-610 

 338092 



338-931 

 339*889 

 340-303 



317136 



316175 

 311192 

 316-758 

 307928 

 309- 180 

 312-914 

 334762 



332-5865 



332-960 



333-5330 

 332-7825 



335-2206 

 334-6760 

 334-8590 

 333-2246 

 329-1546 



329-6498 

 329-3148 

 329-0870 



331-8983 

 330-552 



330-276 

 330-831 

 334-248 

 332 375 

 334- 121 

 331-516 

 334-253 



3327485 

 3320749 



332-4117 



3322715 



332-37 



* Phil. Trans, for 1823., p. 96 et seq. The data are selected from 202 

 experiments made on calm days ; 122 observations for the longer distance, 

 and 80 for the shorter. The mean value is computed by attributing to each 

 determination a weight proportional to the distance of the stations. 



f "(Euvres de Francois Arago," Memoires Scientifiques, vol. ii. p. 1 et seq. 

 In these experiments the signals were not made simultaneously at the two 

 extremities of the base. On the second day the sound of the cannon 

 was readily heard by the observers at one station, but those at the other 

 station heard onlv one out of eleven explosions. 



X Phil. Mag. S. 1. vol. lxiii. p. 1 et seq. (June 1824). 



§ Phil, Trans, for 1828, p. 97 et seq. 



