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occurs arises solely from the high summer temperature. It is to the centre of Asia we must look for an example of this; and accordingly the pressure of the dry air at Barnaul, in Siberia, on a mean of ten years, is 29.760 inches in January, and 28.666 inches in July,-thus showing the enormous difference of nearly eleven tenths of an inch.

687. This question has important bearings on storms, particularly on the storms of Great Britain, which is situated within the southern limits of the region of most anomalous barometric pressure, which has its centre in Iceland. As the summer temperature falls in September and October the pressure is increased over the continents of Asia, Europe, and North America, and consequently air-currents are poured into the northern part of the Atlantic, in larger volume and with accelerated velocity; and since at the same time the temperature is everywhere falling, the whole atmosphere becomes saturated with vapour. This accumulated vapour is discharged in those furious storms of wind and rain which strew our shores with wrecks, and carry misery and desolation into the hearths of our seafaring population. Considering the important interests at stake, no amount of labour and no expense can be regarded as too great which might lead to a better understanding of these great atmospheric disturbances.

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.047 .048

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.054

.055 .056

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.059

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.065 .066

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75

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.134 .136 .139
.136
.136 .139

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.139

.141

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.144

86

89

.141
.149 .151 .154
.138 .141 .144 .146
.149 .151 .154 .156
.141 .143 .146 .149 .151 .154 .157
.143 .146 .149 .151 .154 .157 .159 .162
.146 .148 .151 .154 .156 .159 .162 .165
.148 151 .153 .156 .159 .162 .164 .167

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TABLE II.-FOR CONVERTING MILLIMETRES INTO ENGLISH INCHES AND DECIMALS.

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661

26.024

687 27.048 713 28.071 739 29.095 765 30.119

662 26.063 688 27.087 714 28.111 740

29.134 766 30.158

[blocks in formation]

666 26.221 692 27.245 718
667 26.260 693 27.284 719
668 26.300 694 27.323 720 28.347 746
669 26.339 695 27.363 721
670 26.378 696 27.402 722
671 26.418 697 27.441 723
672 26.457 698 27.481 724
673 26.497 699 27.520 725
674 26.536 700 27.560 726
675 26.575, 701 27.599 727
676 26.615 702 27.638 728
677 26.654 703 27.678 729
678 26.693 704
679 26.733 705 27.756 731
680 26.772 706 27.796 732
681 26.812 707 27.835 733
682 26.851 708
683 26.890 709
684 26.930 710

28.268 744

28-308 745

29.174 767 30.197 29.213 768 30.237 29.252 769 30.276 29.292 770 30.316 29.331 771 30.355

29.371 772 30.394

28.386 747

29.410 773 30.434

28.426 748
28.465 749

29.449 774 30.473

29.489 775 30.512

28.504 750
28.544 751
28.583 752 29.607 778 30.630
28.623753 29.646 779 30.670

29.528 776 30.552

29.567 777 30.591

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685 26.969 711 27.993 737 29.016 763

686 27.008 712 28.032 738 29.056 764 30.079 790 31.103

28.938 761
28.977 762

29.961 787
30.001 788
30.040 789 31.064

30.985 31.024

0

TENTHS OF A MILLIMETRE IN THE DECIMAL OF AN INCH.

1 2 3 4 5 6 7 8 9 0.000 0.004 0.008 0.012 0.016 0.020 0.024 0.028 0.031 0.035

TABLE III.-FOR CONVERTING FRENCH OR PARIS LINES

INTO ENGLISH INCHES.

A Paris Line equals 0.088814 English Inch.

Paris Lines.

English Paris English. Paris English Paris English Paris English
Inches. Lines. Inches. Lines. Inches. Lines Inches. Lines. Inches.

26.733

26.644 312.0 27.710
26.689 312.5 27.754
313.0 27.799

26.777

26.822

27.177

294.5 26.156 306.5

27.221

295.0 26.200 307.0

27.266

295.5 26.245 307.5

27.310

296.0 26.289 308.0 27.355

320 0

288.0 25.578 300.0 324.0 288.5 25.623 300.5 324.5 28.820 336.5 289.0 25.667 301.0 325.0 28.865 337.0 289.5 25.712 301.5 313.5 27.843 325.5 28.909 290.0 25.756 302.0 314.0 27.888 326.0 28.953 290.5 25.800 302.5 26.866 314.5 27.932 326.5 28.998 291.0 25.845 303.0 26.911 315.0 27.976 327.0 29.042 339.0 30.108 291.5 25.889 303.5 26.955 315.5 28.021 327.5 29.087 339.5 292.0 25.934 304.0 26.999 316.0 28.065 328.0 29.131 340.0 292.5 25.978 304.5 27.044 316.5 28.110 328.5 29.175 340.5 293.0 26.023 305.0 27.088 317.0 28.154 329.0 29.220 293.5 26.067 305.5 27.133 317.5 28.198 329.5 29.264 341.5 30.330 294.0 26.111 306.0 318.0 28.243 330.0 29.309 342.0 30.374 318.5 28.287 330.5 29.353 342.5 30.419 819.0 28.332 331.0 29.397 343.0 30.463 319.5 28.376 331.5 29.442 343.5 30.50S 28.420 332.0 29.486 344.0 30.552

28.776 336.0

29.842

29.886

29.930

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TABLE IV.-FOR REDUCING BAROMETRIC OBSERVATIONS TO THE LEVEL OF THE SEA; AND CONVERSELY, FOR THE DETERMINATION OF HEIGHTS BY THE BAROMETER.

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110 .135 .132

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120 .148 .144

.141

130 .160 .156

140 .172

200

.124 .121 .138 .135 .132 .153 .149 .146 .143 .168 .164 .160 .157 .154 .150 150 .184 .179 .175 .171 .168 .165 .160 .157 160 .196 .191 .187 .183 .179 .175 .171 .168 170 .208 .203 .198 .194 .190 .186 180 .220 .215 .200 .206 .201 .197 190 .232 .227 .222 .217 .212 .208 .203 .199 .244 .238 .233 .228 .223 .218 .213 .209

.126

.118 .116
.129

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.126 .124 .121

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.139

.137

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.147 .144

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310 .377 .368 .360 .352 .344 .337 .329 320 .389 .380 .372 .363 .355 .348 .340 .333 .326 .320 330 .401 .391 .383 .374 .366 .358 .350 .343 .336 .329 .012 340 .413 .403 .394 .385 .377 .369 .361 .354 .346 .339 .012 350 .425 .415 .406 .397 .388 .380 .371 .364 .356 .349 .013 360 .438 .427 .417 .408 .399 .390 .382 .374 .366 .859 .013 370 .450 .439 .429 .419 .410 .392 .384 .376 380 .462 .451 .440 .430 390 .474 .463 400 .486 .475

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410 .498 .487 .475 .464 .454 .444 .434 420 .510 .498 .486 .475 .465 .455 .444 .435 430 .522 .509 .497 .486 .476 .465 .455 .446 440 .534 .521 .509 .497 .487 .476 .465 .456 .447 .437 .016 450 .546 .532 .520 .508 .498 .487 .476 .466 .457 .447 .016 460 .558 .544 .532 .520 .509 .498 .486 .477 .467 .457 .017 470 .570 .556 .543 .531 .520 .508 .497 .487 .477 .467 .017 480 .581 .568 .555 .542 .530 .519 .507 .497 .487 .477 .018 490 .593 .579 .566 .553 .541 .529 .518 .507 .497 .486 .018 500 .605 .591 .577 .564 .551 .539 .528 .517 .507 .496 .018

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