ATMOSPHERE AND THE ACOUSTIC EFFICIENCY OF FOG-SIGNAL MACHINERY. 271 
Line III. 
Position 
Phono- 
ft 
Position 
Phono- 
Position 
Phono- 
Position 
Phono- 
Posit ion 
Phono- 
No. 
meter. 
No. 
meter. 
No. 
meter. 
No. 
meter. 
No. 
meter. 
1 
(22 -5) 
3 
6 -2 
5 
5 -2 
7 
6 5 
9 
7 6 
2 
7-8 
4 
— 
6 
5 '2 
8 
7 -2 
10 
(19 -2) 
Lem arks. 
Readings plotted on Chart 1. Wind, 2 miles per hour from E. Time, 12 '02 p.m. 
1. Resonator at position 0; reading, 15'0; entry for position 8 calculated from observation 2 below. 2. Resonator at 
positions 0 and 8 ; readings, 5 '2 and 7 '8. 5. Most distant station, 250 feet. 10. Resonator at position 0; reading, 12 '8; 
entry calculated for position 8 from observation 2 above. Observations at control station, 12.25 pm. ; mean of three 
phonometer readings, 8 '0. 
Line IV. 
Position 
No. 
Phono¬ 
meter. 
Position 
No. 
Phono¬ 
meter. 
Position 
No. 
Phono¬ 
meter. 
Position 
No. 
Phono¬ 
meter. 
Position 
.No. 
Phono¬ 
meter. 
1 
(16 1) 
13 
0 '7 
25 
0 -25 
37 
0-2 
49 
1 -5 
2 
5 '8 3 
14 
0 '4 
26 
0 '2 
38 
0 -2 
50 
2 -8 
3 
7 '83 
15 
0 -6 
27 
0 -2 
39 
— 
51 
2 75 
4 
4 -2 
16 
0 -5 
28 
0 T 
40 
0-3 
52 
3 -2 
5 
3 4 4 
17 
— 
29 
0 -2 
41 
— 
53 
3 7 
6 
2 -6, 
18 
— 
30 
— 
42 
0 ’4 
54 
— 
7 
2 2 
19 
0 -25 
31 
— 
43 
0 -7 
55 
7 -3 
8 
1 7 
20 
0 -25 
32 
— 
44 
0 -7 
56 
7 -8 
9 
1 0 
21 
0 -2 
33 
— 
45 
0 -9 
57 
5 -0 
10 
0 -8 
22 
0 -25 
34 
0 -25 
46 
0-7 
58 
7 -1 
11 
0-7 
23 
0 -2 
35 
— 
47 
1 1 
12 
0 '6 
24 
0 -3 
36 
— 
48 
1 8 
Remarks. 
Readings plotted on Chart 1. Wind, 2 miles per hour from W., and variable. 
1. Resonator at position 0 ; reading, 5 '0; entry for position 8 calculated from observation 2 below. 2. Resonator at 
positions 0 and 8 ; readings, 1 '8 4 and 5 '8 3 . 29. Most distant station, 1450 feet. 45. Wind changes direction. 48. Wind 
at right angles to direction of sound. 50. Wind along direction of sound. 55. Wind drops to calm. 
Line VI. 
Position 
No. 
Phono¬ 
meter. 
Position 
No. 
Phono¬ 
meter. 
Position 
No. 
Phono¬ 
meter. 
Position 1 
No. 
Phono¬ 
meter. 
Position 
No. 
Phono¬ 
meter. 
1 
5 *6 
7 
3-1 
13 
0 -4 
19 
0 
■75 
25 
4'7 
2 
5’4 6 
8 
1 9 
14 
0-7 
20 
0 
'65 
26 
6-8 
3 
3 4 
9 
0 -6 
15 
0 -4 
21 
0 
•9 
27 
7 -8 
4 
7 -0 
10 
0 -9 
16 
0 -3 
22 
1 
■2 
2S 
4-9 
5 
5 '6 
11 
0 -5 
17 
0-7 
23 
2 
•2 
29 
3 3 5 
6 
3 -3 
12 
1 -o 
18 
0-6 
24 
3 
•9 
30 
8-3 3 
Remarks. 
Readings plotted on Charts 1 and 2. Wind, 2 miles per hour from W., and very variable. 
15. Most distant station, 750 feet. Wind from W. Thunder clouds moving up from N.W. 20. Time 2.14 p.m. 
Slight shower of rain commences. 28. Wind dies away completely. 
