264 DR. LOUIS VESSOT KING ON THE PROPAGATION OF SOUND IN THE FREE 
No. 12. September 17, 1913. Table 12 and Chart 12. 
Note the influence of the wind in strengthening the distribution of sound in the direction in which 
it is blowing. 
No. 13. September 19, 1913. Table 13 and Chart 13. 
Weather conditions unusually favourable to transmission of sound. The distribution over the circle 
of two miles radius is greater than can be accounted for by the inverse-square law of propagation. Note 
the remarkably uniform distribution over an arc of nearly 180 degrees. 
Chart 13. Acoustic survey, September 19, 1913. 
