368 PROPAGATION THROUGH THE STANDARD ATMOSPHERE 
TaBLe 1 (Continued) 
h(m) tC) 
=E0 2 4 6 8 10 12 14 16 18 
0 | 289.4 287.3 285.2 283.2 281.1 279.2 277.2 275.3 273.4 271.5 
10 | 289.0 286.9 284.8 282.8 280.8 278.9 276.9 274.9 273.1 271.2 
20 | 288.7 286.6 284.5 282.5 280.5 278.5 276.6 274.6 272.8 270.9. 
30 | 288.3 286.2 284.1 282.1 280.1 278.2 276.2 274.3 272.4 270.5 
40 | 288.0 285.9 283.8 281.8 279.8 277.8 275.9 274.0 272.1 270.2 
50 | 287.6 285.5 283.4 281.4 279.5 277.5 275.6 273.7 271.8 269.9 
75 | 286.6 284.7 282.6 280.6 278.7 276.7 274.8 272.8 271.0 269.1 
100 | 285.8 283.8 281.7 279.7 277.8 275.8 273.9 272.0 270.2 268.3 
150 | 284.0 282.0 280.0 278.0 276.1 274.2 272.3 270.4 268.6 266.8 
200 | 282.2 280.2 278.3 276.3 274.4 272.5 270.7 268.8 267.0 265.2 
250 | 280.5 278.5 276.6 274.7 272.8 270.9 269.1 267.2 265.4 263.7 
300 | 278.7 276.8 274.9 273.0 271.1 269.2 267.4 265.6 263.8 262.1 
350 | 277.0 275.1 273.2 271.3 269.4 267.6 265.8 264.0 262.2 260.5 
400 | 275.3 273.4 271.5 269.6 267.8 266.0 264.2 262.5 260.7 259.0 
450 | 273.5 271.7 269.8 268.0 266.2 264.4 262.6 260.9 259.2 257.5 
500 | 271.8 270.0 268.1 266.3 264.6 262.8 261.1 259.4 257.7 256.0 
600 | 268.5 266.7 264.9 263.1 261.4 259.6 258.0 256.3 254.7 253.0 
700 | 265.1 263.4 261.7 259.9 258.2 256.5 254.9 253.2 251.6 250.1 
800 | 261.8 260.1 258.4 256.7 255.0 253.4 251.8 250.3 248.7 247.2 
900 | 258.6 256.9 255.2 253.6 252.0 250.4 248.8 247.3 245.8 244.3 
1,000 | 255.3 253.7 252.1 250.5 249.0 247.4 245.9 244.4 242.9 241,4 
1,500 | 239.9 238.5 237.0 235.6 234.3 232.9 231.6 230.3 228.9 227.6 
2,000 | 225.3 224.1 222.9 221.7 220.5 219.3 218.1 217.0 215.8 214.7 
32.0 35.6 39.2 42.8 46.4 50.0 53.6 57.2 60.8 64.4 
Taste 1 (Continued) 
Finally, M, = 0.157h, if his in meters, or M, = 0.048h, information about the atmospheric stratification 
if h is in feet, may readily be computed by means of a near ground level. Radiosonde data are too widely 
slide rule. M is then obtained by addition. spaced (vertical distances of the order of 100 meters 
between successive readings) for reliable determina- 
tion of the variation of M with height at low levels. 
Special instruments have therefore been developed 
Ordinary weather data give comparatively little in recent years for low-level soundings. Such instru- 
Atmospheric Stratification 
