TABLE XI.

Mean Monthly Pressures of Dry Air for every Two Hours, 1862.

Month. oh 2h

4h 6h 8h 10h 12h

+

16h 18h 20h 22h Means.

January
February..

in. in. in. in. in. in. in. in. in. in. in. in.
29401 393 410 424 426 428 423 413 401 387 393 404 29:409

in.

633 626 634 650 655 664 661 653 649 642 653 652

*648

March

April

May

June

July

216 179 173 186 197 203 204 196 194 199 205 209 496 479 471 478 495 502 517 511 513 523 516 506 298 291 294 316 332 352 355 361 364 363 343 327 280 270 259 273 299 327 329 330 338 334 321 300 335 324 313 329 349 366 371 366 371 360 349 352 August 367 364 364 376 392 402 407 411 406 402 377 385 September 440 426 421 437 463 481 475 471 470 482 471 458 October 340 324 332 357 374 384 383 368 360 356 356 353 November. 529 522 529 552 564 570 570 565 558 555 564 561 December. 516 504 528 539 549 550 556 546 538 535 541 555

*197

'501

333

*305

Means

*553

*538 29404 392 394 410 425 436 438 433 430 428 424 422 29420

And the means under the different hours may be represented as usual by the formula

Px = 29′420 + 0·020 Sin (x + 238° 3′) + 0·008 Sin (2x + 169°47′) + 0·002 Sin (3x + 161° 34′).

In the Results for the year 1860, the corresponding formula was accidentally omitted. It is

Px 29'349+0018 Sin (x + 227° 13′)+ 0.008 Sin (2x + 182° 21') + 0·001 Sin (3x + 66°48′).

TABLE XII.

Mean Monthly Directions of the Wind for every Two Hours, derived from the Indications of the Anemograph, 1862.

Month.

oh 2h

January
February
March
April

May

June

July

Hours from Noon.

6h 8h 10h 12h 14h 16h 18h 20h 22h

242 241 236 234 227 230 227 235 246 260 252 254 235 235 238 241 241 244 225 222 226 231 230 232 238 216 198 213 218 227 269 231 245 256 236 226 September 31 359 12 51 78 291 69 7 49 20 78 95 October 240 234 232 228 217 223 223 223 218 216 222 226

August

933

November 24 2 8 9 15 327 229 249 295 287 253 281 December 251 255 249 246 241 246 242 243 238 241 239 244

Means

234 235 234 232 227 231 228 229 229 235 229 233

TABLE XIII.

Mean Bi-Horary Velocities of the Wind for each Month, estimated in the Directions given in the preceding Table, 1862.

Hours from Noon.

Month.

ob-2h. 2b-4h. 4h-6h. 6h-8h. 8h-10h. 10h-12h. 12h-14h. 14h-16h, 16h-18h. 18h-20h. 20h-22h. 22h.

TABLE XIV.

Actual Mean Monthly Bi-Horary Velocities of the Wind in 1862.

Velocities in the Bi-Horary Intervals.

Month.

Means.

h. h. h. h. h. h. h. h. h. h. h. h. h. h. h. h. h. h. h. h. h. h. h. h.
0-2 2-4 4-6 6-8 8-10 10-12 12-14 14-16 16-18 18-20 20-22 22-0

January

February

March

2495

25.6 22.7 21.4
2713 26.0 20.8
25'4 23'1

Miles. Miles. Miles. Miles. Miles. Miles. Miles. Miles. Miles. Miles. Miles. Miles.
21'4
20 2

Miles.

20 2 20'7 2213 23'0 22.1 214 233 26.8
19'9 19'9 204 195 206 224 24.8 28.2
23'4
22.0 21.8 199 2013 18.2 20'2 219 23'1
22 I 205 198 172 172 177 194 265 28-8
193 178 175 163 16'0 15.8 18.1 21.1 23.0
172

22.6

22.5

22.0

22.9

19.6

18.1

12.0

12'4

220 265 28.0
17.8 19.1 22'0 27.3 26.3
119 12'4 14'1 16.7 194
12.7
13.0 12.5
22.5 21'1 20'4
13'3 | 139 || 14°2
26.6 27.6 28.2

22:4

23.8

15'5

134 184 19'7
19'5 244 26'1
22.8
134 14'1 17.3 13'9
27.8 27.4 30.8 27.0

15.8

Means

of

Velocities.

Means
of

Relative Velocities.

2483 23.88 2160 1975 1893 1871 1832 18:21 18:28 19:48 22.70 24 79 20.80

1194 1148 1039 0.950 0910 0900 0.881 0.876 0879 0937 1091 1192 1000

The absolute and relative velocities for the whole year for any hour may 15 be represented respectively by

Vx = 20·80+3'372 Sin (x+90° 55') + 1·093 Sin (2x+114° 40′) + 0.149 Sin (3x + 220° 28′),

and

Vx = I + 0162 Sin (≈ + 90°55′) + 0·053 Sin (2x + 114° 40′) + 0·007 Sin (3x + 220° 28′).