428 
Dr. Moll's account of the experiments on 
a constant volume, and the specific heat of air at a constant 
pressure. Thus the final formula for the velocity of sound, 
given by theory, is 
10466, 82xo m , 76 {1 + * . 0,03375 
Substituting in this formula the quantities stated above, 
theory gives the velocity of sound for the state of the 
atmosphere on the 27th of June, 1823, when the ex- 
periments were made, V = 335,14 metres, or 1099,885 En- 
glish feet ; but the velocity as obtained by experiment was 
340,06 = 1116,032 feet. 
Difference between theory and experiment the 27th of 
June, 4,92 metres = 16,147 feet. 
