280 DR. LOUIS VESSOT KING ON THE PROPAGATION OF SOUND IN THE FREE 
Table 9.— Long Range Acoustic Survey, September 10, 1913. 
Father Point Meteorological Observations. 
Wind : 10-11 a.m., velocity, 4 miles per hour from E. 11-12 a.m., 10 miles per hour from E. 
Weather, clear. Clouds, none. 
Phonometer Readings. 
Position 
No. 
Phono¬ 
meter. 
Position 
No. 
Phono¬ 
meter. 
Position 
No. 
Phono¬ 
meter. 
Position 
No. 
Phono¬ 
meter. 
Position 
No. 
Phono¬ 
meter. 
1 
0 T5 
14 
0 ’3 
27 
o -o 
40 
53 
1 3 
2 
0 To 
15 
0 '2 
28 
o -o 
41 
— 
54 
1 -o 
3 
0 -06 
16 
0 T 
29 
— 
42 
— 
55 
4 -0 
4 
0 T 
17 
0 T 
30 
— 
43 
— 
56 
4 -2 
5 
0 T 
18 
0 T 
31 
— 
44 
0 3 
57 
2 6 
6 
0 -3 
19 
0 05 
32 
— 
45 
0 '3 
58 
1-6 
7 
0 35 
20 
0 To 
33 
— 
46 
1 -o 
59 
1 6 
8 
0 -25 
21 
o -o 
34 
— 
47 
1 -2 
60 
0 '9 
9 
0 6 
22 
o-o 
35 
— 
48 
0'6 
61 
0 4 
10 
0 -7 
23 
0 -05 
36 
— 
49 
0 9 
62 
0 3 
11 
0 -7 
24 
o -o 
37 
— 
50 
0 '8 
63 
0 T 
12 
0 7 
25 
0 0 
38 
— 
51 
1 -5 
13 
0 -6 
26 
o -o 
39 
0 15 
52 
2-0 
Remarks. 
10.38 a.m. Left Rimouski wharf. Sea smooth. Sky unclouded. Air temperature, 50° E. 
1. Time, 10.51 a.m. Commencement of circular course at 1 mile. 6. Air temperature, 47° F. 9. Fog-signal in line with 
end of Father Point wharf. 26. Audible. 29-32. Barely audible. 33-34. Audible. 35. Time, 11.29 a.m. Course 
altered. Signal barely audible. 43. Time, 11.37 a.m. Commencement of circular course at J mile. 58. Ship enters 
acoustic shadow of wharf. 59. Wind drops to a light breeze. 63. Time, 11.56 a.m. End of circular course. Ship turns 
to Father Point wharf. Air temperature, 50° F. 
Control Observations. 
End of Father Point wharf .—Phonometer reading, 5 '0. Slight echo audible. 
Control station .—Phonometer reading, 9 '3. 
