BAROGRAPHIC RESULTS. TABLE I. Mean Monthly Heights of the Barometer for every Two Hours, 1862. in. January 6h 8h 10h 12h 14h 16h 18h 20h 22h Means. in. in. in. in. in. in. in. in. in. in. in. in. 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 March April May June August 872 ,,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 "'663 ,,733 727 718 719 729 734 730 718 714 719 726 728,,725 ,,732 730 724 734 751 757 754 745 737 748 754 756,744 September ,816 802 794 804 824 821 817 810 808 821 830 829|| „,814 October... ,,666 660 660 674 680 681 678 671 663 660 667 669 *669 November.,,749 746 755 769 774 774 770 760 749 747 757 763,760 December.,, 782 780 792 801 808 810 807 802 796 791 797 815 Means 29712 704 703 711 721 725 722 714 708 712 719 722 29715 ,*798 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, Bx = 15 B+a Sin (x+4) + 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 0°, 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. Mar. April. May. June. July. Aug. Sept. Oct. Nov. Dec. 8 +020·009+ ·002 ioo. -100. -·004+·003+005+005+012+ 014+009 9+020 +011+005+003+005+004+009 +012 +010 +013+015 +010 10 +018 +012+005+007+009+009+012+ 014+009+013 +014+009 11+016 +011+005+007 +009 +010 +011+014+006+012 +013+010 12 +014 +010+ ·002+006 + ·008+007+005 +011+002+009 +012 +011 20022001 +010 +013+017+012+001+013+017] -'002 -.005 600. 600. 900. 900. 100. -'013 012007 ooo. 100. +910. +800. +900. +600. +600. +110. +610. +900. +010. — 010. + 200. +400. +900. +100. + 400. +410. +£00. +1900. 8oo. +100.+100.. 100. -'007 004 23 910. +210. +800. +210. +910. + E10. +910. +900. +910. — 110. +600. +zoo.. THERMOGRAPHIC RESULTS. TABLE IV. Mean Monthly Temperature of the Air for every Two Hours, 1862. June 40'1 41°3 43'6 49'4 January 414 423 410 401 396 392 395 395 395 396 39°2 40'8 Means 55'0 56.2 58.6 59'1 38.2 44.6 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 T2 = T + a Sin (x + A) + b Sin (2x + B) + c Sin (3x+C) + &c. x 15 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. 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 x, the values o°, 15°, 30°, &c., we obtain the following Table, which gives the hourly values of the Diurnal Inequalities for each Month. |