260 DR. LOUIS VESSOT KING ON THE PROPAGATION OF SOUND IN THE FREE 
No. 4. August 30, 1913. Table 4 and Chart 4. 
Meteorological conditions unusually favourable to long-distance propagation. Note the fairly regular 
undulatory character of the gradient. In the writer’s opinion this peculiarity affords evidence of some 
sort of regular structure in the wind explained by the existence of large scale eddies according to the 
theory proposed by Taylor and briefly discussed in Section 11. The question is discussed in greater 
detail in Section (iii.) of the present Appendix. 
No. 5. September 3, 1913. Table 4 and Chart 4. 
Note the poor propagation against the wind (observations 1 to 6); the signal was first heard from the 
navigating bridge, about 10 feet above the observer at the phonometer and about 20 feet above sea level, 
Chart 5. Acoustic survey, September 3, 1913. 
