278 DR. LOUIS YESSOT KING ON THE PROPAGATION OF SOUND IN THE FREE 
Table 7.— Long Range Acoustic Survey, September 5, 1913. 
Father Point Meteorological Observations. 
Barometer, 29 - 97. Air temperature: dry bulb, 47° F.; wet bulb, 44° F. Wind: velocity, 10-11 a.m., 6 miles per 
hour from E.; 11-12 a.m., 3 miles per hour from E. 
Weather, partly clear. Clouds moving from W. Sky 80 per cent, clouded over. 
Phonoheteb Readings. 
Position 
No. 
Phono¬ 
meter. 
1 
2 
— 
3 
— 
4 
— 
5 
0 T 
6 
0 1 
7 
0 '2 
8 
0 -25 
9 
0 -25 
10 
0 3 
11 
0 3 
12 
0 -3 
13 
0 '4 
14 
0 -5 
Position 
No. 
Phono¬ 
meter. 
15 
0 -6 
16 
0-7 
17 
0'8 
18 
1 1 
19 
1 ’3 
20 
1 1 
21 
2 -0 
22 
2-7 
23 
4-0 . 
24 
5'3 
25 
6 -0 
26 
3 0 
27 
1 -o 
28 
0 -4 
Position 
No. 
Phono¬ 
meter. 
29 
0'6 
30 
0-5 
31 
— 
32 
0-3 
33 
0 ’25 
34 
0-2 
35 
0 T5 
36 
o-i 
37 
0 -i 
38 
0 -2 
39 
0 -3 
40 
0 T 
41 
0 T 
42 
01 
Position 
No. 
Phono¬ 
meter. 
43 
0-15 
44 
o-o 
45 
0 -05 
46 
0 1 
47 
0-15 
48 
0 -15 
49 
01 
50 
0 15 
51 
0 1 
52 
0 1 
53 
0 15 
54 
0 '25 
55 
0 -2 
56 
0'3 
Position 
No. 
Phono¬ 
meter. 
57 
0 2 
58 
0-15 
59 
0-2 
60 
0-2 
61 
0 3 
62 
0 '45 
63 
0-7 
64 
1 3 
65 
1 6 
66 
2 -0 
Remarks. 
10.23 a.m. Left Riniouski wharf. Sea smooth, showing regions ruffled by variable breezes. Sky overcast by light fleecy 
clouds. Air temperature, 47° F. 
1. Time, 10.53 a.m. Course set towards fog-signal. Signal not heard. Air temperature, 46° F. 
2-4. Signals not heard. 
14-16. Signals show marked increase in audibility. 25. Time, 11.16 a.m.; ship turning along new course. 44. Signals 
just audible. 45. Time, 11.38 a.m.; ship turning back along same course; air temperature, 48° F. 66. Time, 11.58 a.m. 
Ship turns in to Father Point wharf ; air temperature, 52° F. 
Control Observations. 
End of Father Point wharf .—Mean of four phonometer readings, 4 "2. 
Control station .—Mean of four phonometer readings, 6'8. 
Mean air-pressure operating diaphone, 18 - 3 lbs./sq. in. above atmospheric. 
