PHILOSOPHICAL TRANSACTIONS 
ROYAL SOCIETY OE LONDON 
Series A, Vol. 218. Pp. 211-293. 
[Plate 1.] 
I ON THE PROPAGATION OE SOUND 
|| IN THE FREE ATMOSPHERE 
AND THE ACOUSTIC EFFICIENCY OF FOG-SIGNAL MACHINERY 
| AN ACCOUNT OF EXPERIMENTS CARRIED OUT 
AT FATHER POINT, QUEBEC, SEPTEMBER, 1913. 
LOUIS VESSOT KING, M.A. (Cantab.), D.Sc. (McGill), 
ASSOCIATE PROFESSOR OF PHYSICS, McGILL UNIVERSITY, MONTREAL, 
Printed and Published for the EOYAL SOCIETY by 
HARRISON AND SONS, 44-47, ST. MARTIN’S LANE, LONDON, W.C. 2, 
i|3rintfrS to (Jhr&uiarg ta ©uf iHajejftp. 
1919. 
A 664. 
23.4.19. 
\Price Five Shillings. 
