BAROGRAPHIC RESULTS. TABLE I. Mean Monthly Heights of the Barometer for every Two Hours, 1862. 2h 4h 6h 8h 10h 12h 14h 16h 18h 20h 22h Means. in. in. in. in. in. in. in. in. in. in. in. in. in. April May June July 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 ,, *663 197725 "'744 » '814 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 at the hour after noon to be represented by the usual formula, 15 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. 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. ··006 + ·003 +007—·007+002 002+005 -·006+·003 -'013-007-008 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 - -'020 -'017 010.+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. – 'OII -'002 100. ··004+·003+005+005 +012 + 014+009 11+016 +011+005 + 007 +009 +010 +011+014+006+012 20-022+001 +010 +013 +017+012+001+013+017—·004 100. 800. -'007 Loo. goo. -'013 -'012 600.. 900. 900. 100. 010. +200. + 400. +900. +100. +400. +410. +£00. +900. 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. fo 2h 4h 6h 8h 10h 12h 14h 16h 18h 20h 22h Means. April 533 544 544 525 49'5 40'1 415 41°3 44'5 43'6 514 49'4 573 55'0 56.2 January 414 423 410 40′1 396 392 395 39′5 39′5 396 39′2 40.8 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 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. 15 TABLE V. Values of the Constants in the Periodical Expression for the Mean Monthly Diurnal Inequalities of Thermographic Results, for the Year 1862. 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. |