282 
DE. LOUIS VESSOT KING ON THE PEOPAGATION OF SOUND IN THE FEEE 
Table 11.—Long Range Acoustic Survey, September 16, 1913. 
Father Point Meteorological Observations. 
Barometer, 30 '49. Air temperature : dry bulb, 52° F.; wet bulb, 48° F. 
Wind: 9-10 a.m., velocity, 12 miles per hour from W.; 10-11 a.m., 13 miles per hour from W. 
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 
16 
3 '5 
31 
0 -3 
46 
0-3 
61 
0-2 
2 
— 
17 
5 -0 
32 
0 -i 
47 
0 -6 
62 
0-3 
3 
— 
18 
2 -0 
33 
o -o 
48 
1 T 
63 
0-3 
4 
— 
19 
2 -0 
34 
o -o 
49 
1 3 
64 
0 ’3 
5 
— 
20 
i -o 
35 
o -i 
50 
1 '4 
65 
0 '2 
6 
— 
21 
2 3 
36 
0 '2 
51 
2 '3 
66 
0 '4 
7 
— 
22 
0 '9 
37 
O'l 
52 
2 -0 
67 
0 6 
8 
— 
23 
0 '7 
38 
0 '2 
53 
0 '3 
68 
0 -8 
9 
— 
24 
0 '4 
39 
0 ’5 
54 
0 '5 
69 
0 '8 
10 
— 
25 
1 2 
40 
0 ’3 
55 
0 '8 
70 
0 9 
11 
— 
26 
0 '8 
41 
0 '3 
56 
1 5 
71 
1 2 
12 
— 
27 
0 '3 
42 
0 '4 
57 
1 '6 
72 
2'6 i 
13 
0 '2 
28 
0-2 
43 
0 '8 
58 
0 6 
14 
1 -o 
29 
0 '3 
44 
0 '8 
59 
0 -3 
15 
4'0 
30 
0 ’2 
45 
0 '3 
60 
0 -3 
Remarks. 
9.27 a.m. Left Rimouski wharf. Sea moderate; waves breaking. Sky perfectly clear. Air temperature, 54° F. 
1. Time, 9.42 a.m. Signal first heard. 2-10. Signals barely audible. 11. Just audible. 12. Audible. 18. Time, 9.59 a.m. 
Ship starts on course away from fog-signal. 33. Time, 10.17 a.m. Ship turns back along the same course. 45. Sky 
becomes slightly overcast. 51. Time, 10.35 a.m. Ship turns back along same course. 53. Phonometer in acoustic shadow 
of deck house. 62. Time, 10.47 a.m. Ship turns back towards fog-signal. 72. Ship turns into Father Point wharf. Ail- 
temperature, 54° F. 
Control Observations. 
End, of Father Point wharf. —Mean of four phonometer readings, 1 '5. 
Control station. —Mean of four phonometer readings, 6 '5. 
Mean air pressure operating diaphone, 19 '7 lbs./sq. in. above atmospheric. 
