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BAROGRAPHIC RESULTS.

TABLE I.

Mean Monthly Heights of the Barometer for every Two Hours, 1862.

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

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in. in. in. in. in. in. in. in. in. in. in.

in.

April

May

June

July

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January 29.626 621 631 640 643 648 640 632 620 604 607 618 29.627 February.. ,870 861 864 875 880 885 881 872 864 862 874 880 872 March ,,454 435 427 435 444 447 444 437 432 439 450 460 „,442 ,, 781 771 767 769 783 785 787 784 777 787 793 792,782 ,,672 664 661 667 679 688 685 681 680 689 697 688 , *679 ,,667 656 648 649 661 671 668 661 659 671 677 669 ,,733 727 718 719 729 734 730 718 714 719 726 728 August ,,732 730 724 734 751 757 754 745 737 748 754 756 September,, 816 802 794 804 824 821 817 810 808 821 830 829 October ... 666 660 660 674 680 681 678 671 663 660 667 669 November. ,,749 746 755 769 774 774 770 760 749 747 757 763 December. 782 780 792 801 808 810 807 802 796 791 797 815

Means

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197725

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» '814

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29 712 704 703 711 721 725 722 714 708 712 719 722 29715

The Tables of "Mean Monthly Results" in this section are formed from the days in each month in which the two-hourly records are complete, no imperfect days being used; while in the preceding section use has been made of all the observations recorded. This will account for some slight differences in the monthly means.

Supposing the general expression for the height of the Barometer

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at the hour after noon to be represented by the usual formula,

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Bx = ẞ+a Sin (x + A) + b Sin (2x + B) + c Sin (3x+C) +&c.,

then the following Table gives the values of the constants ẞ, a, b, c, A, B, C, derived from the solution of the equations formed by the substitution of the mean monthly indications of the Barograph for every two hours in the general expression.

TABLE II.

Values of the Constants in the Periodical Expression for the Mean Monthly Diurnal Inequalities of Barographic Results, for the Year 1862.

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Substituting for x, (the hour angle from mean noon, expressed in degrees,) the values o°, 15°, 30°, 45°,...315°, and 345°, we obtain the following Table, which gives the hourly values of the Diurnal Inequalities for each Month.

TABLE III.

Excess of the Mean Monthly Result of the Barograph at each Hour, above the Mean Monthly Result for the Day, for the Year 1862.

Jan.

Feb. Mar. April. May. June. July. Aug. Sept. Oct. Nov. Dec.

Hour.

h.

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··006 + ·003 +007—·007+002

002+005 -·006+·003

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014017

·018-014-010-014

-011-007-012-017

610.10.

+10.900.

-003-012-012

4+001

8oo.

5+006-003 6+013+002) 7+019+007

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010.+910. + E10. +010. +10. +600. + too. + Soo. + Eoo. + 900. +110. + ozo. +6 600. +10. +10. +600. +10. +210. +600. +600. +400. +900. +10. +810. +01

600. +10. + 600. +100.

200. + 200.

600.410.

800.610.810.400.

900. —900. 700.

110.800. –

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100.

··004+·003+005+005 +012 + 014+009

11+016 +011+005 + 007 +009 +010 +011+014+006+012
12 +014 +010+ 002 +006+008+007+005+011+002+009 +012

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20-022+001 +010 +013 +017+012+001+013+017—·004

100.

800.

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Loo.

goo.

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600..

900.

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900.

100.

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910. +210. +800. + 210. +910. + E10. +910. +900. +910.-12 100. +910. +800. +900. +600. +600. +110. +610. +900. +010.-22

THERMOGRAPHIC RESULTS.

Month.

TABLE IV.

Mean Monthly Temperature of the Air for every Two Hours, 1862.

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

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April 533 544 544 525 49'5
May
June

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40'1

415

41°3

44'5

43'6

514

49'4

573

55'0

56.2

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January 414 423 410 40′1 396 392 395 39′5 39′5 396 39′2 40.8
February.. 437 443 438 424 412 406 40'2 399 396 397 399
March 469 471 466 448 43'4 423 414 413 414 414 422
476 462 452 447 452 481
59.8 608 60.6 58.3 547 528 511 49'9 49'3 514 541
604 610 615 598 564 53.6 52.5 510 503 528 563 59°2
July 635 647 652 62.5 58.6 557 544 530 520 548
August 649 660 657 631 59°3 571 550 536 527 533
September 621 62.8 619 58.8 561 544 528 521 518 517 548 59'1
October... 551 554 544 515 503 498 494 49°2 49'0 487 503 53'3
November. 42.5 43 2 414 400 383 372 36.3 35.5 35.5 354 355 38.2
December. 467 469 45'7 446 444 441 43'9 43′9 43'9 43'5 433 448

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51'4

38.2

44.6

Means 53 36 5408 53 52 51 53 49°32 47.87 46.89 46 18 45.81 46°46 48 19 5109 49'50

The same remark is applicable to this Table as to Table I; namely, that the mean results are not quite identical with those in the preceding section.

If

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TT+a Sin (x+4) + b Sin (2x + B) + c Sin (3x + C) + &c. represent the mean monthly temperature of the air for any hour after mean noon, then, as before, we find the following values for the constants.

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TABLE V.

Values of the Constants in the Periodical Expression for the Mean Monthly Diurnal Inequalities of Thermographic Results, for the Year 1862.

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Substituting for 2, the values o°, 15°, 30°, &c., we obtain the following Table, which gives the hourly values of the Diurnal Inequalities for each Month.

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