284 DR. LOUIS YESSOT KING ON THE PROPAGATION OF SOUND IN THE FREE 
Table 13.—Long Range Acoustic Survey, September 19, 1913. 
Father Point Meteorological Observations. 
Wind : 8-10 a.m., average velocity 2 miles per hour from W. 
Weather, clear. No clouds. 
Phonometer Readings. 
Position 
x\0. 
Phono¬ 
meter. 
Position 
No. 
Phono¬ 
meter. 
Position 
No. 
Phono¬ 
meter. 
i Position 
No. 
Phono¬ 
meter. 
Position 
No. 
Phono¬ 
meter. 
i 
0 -2 
17 
1 0 
33 
0-7 
49 
0 o 
65 
1 3 
2 
0 -4 
18 
0 7 
34 
0 6 
50 
0 2 
66 
1 '4 
3 
0 3 
19 
1 0 
35 
0 -7 
51 • 
0 2 
67 
0 8 
4 
0 5 
20 
— 
36 
0-2 
52 
0 1 
68 
1 -8 
5 
0 -4 
21 
0 -3 
37 
0-6 
53 
0 T 
69 
3 2 
6 
0 5 
22 
0 3 
38 
0 -3 
54 
— 
70 
2 0 
7 
0 5 
23 
0 7 
39 
0 -3 
55 
— 
71 
3 -2 
8 
0 '8 
24 
0 3 
40 
0 '4 
56 
0-0 
72 
2 2 
9 
0 9 
25 
0 2 
41 
0 6 
57 
0-0 
73 
1 6 
10 
1 0 
26 
1 6 
42 
0 -8 
58 
0-3 
74 
3 1 
11 
0 -7 
27 
1 2 
43 
0 7 
59 
0 2 
75 
2-8 
12 
1 2 
28 
0 3 
44 
0-6 
60 
0 2 
76 
1 *7 
13 
0 6 
29 
0-6 
45 
0 7 
61 
0 5 
14 
0 9 
30 
0 '4 
46 
1 1 
62 
1 0 
15 
0'6 
31 
0-6 
47 
1 0 
63 
— 
16 
— 
32 
1 3 
48 
0-6 
64 
0 -6 
Remarks. 
8.40 a.m., left Rimouski wharf. Sea smooth. Sky unclouded. Very light breeze. Air temperature, 59° F. 
1 . Time, 8.55 a.m. Commencement of circular course at 1 mile radius. 21. Time, 9.12 a.m. Course away from fog- 
signal. 26. Time, 9.18 a.m. Commencement of circular course at 2 miles radius. 54. Time, 9.48 a.m. Course towards 
fog-signal. Signal barely audible. 56. Signal just audible. 57. Audible. 63. Time, 9.58 a.m. Commencement of circular 
course at J mile radius. 68. Marked echo : audible for 10 seconds. 76. Time, 10 11 a.m. Course set towards Father Point 
wharf. Air temperature, 53° F. 
Control Observations. 
End of Father Point wharf. —Mean of four phonometer readings, 5'0. Echoes audible for 20 seconds. 
Control station. —Phonometer reading, 6'8. 
Mean air pressure operating diaphone, 24'7 lbs./sq. in. above atmospheric. 
