14 



DISCUSSION OF THE VERTICAL FORCE. 



In January at O"" the final mean is 637 which diflfers so much from the standard 

 value at this liour that it was preferred to substitute the mean of the month (658) 

 as a close approximation. 



Table IY. Continued. Ri-uourly Normals op the Vertical Component in 1843. 



The observations are made 23J" after the full hours. 



1843. 



January 



February 



March. 



April 



May 



June 



July 



August 



September 



October 



November 



December 



715 



698 

 698 

 691 

 703 

 721 

 714 

 742 

 752 



712 

 699 

 691 

 692 

 703 

 719 

 707 

 745 

 733 



717 

 695 

 693 

 692 



708 

 721 

 712 

 745 

 740 



716 

 690 

 687 

 686 

 706 

 716 

 717 

 744 

 740 



708 

 682 

 677 

 679 

 698 

 707 

 706 

 742 

 740 



702 

 680 

 668 

 672 

 683 

 706 

 703 

 737 

 729 



709 

 677 

 663 

 662 

 669 

 693 

 702 

 735 

 727 



690 

 697 

 686 

 700 

 668 

 658 

 658 

 671 

 692 

 703 

 731 

 743 



696 

 677 

 659 

 659 

 672 

 692 

 704 

 746 

 758 



696 

 685 

 669 

 666 

 682 

 703 

 714 

 749 

 767 



710 

 691 

 681 

 677 

 695 

 714 

 719 

 749 

 764 



709 

 695 

 689 

 685 

 699 

 710 

 714 

 746 

 754 



Normals at additional odd hours. 



October 



November 



December 



710 

 740 

 744 



713 

 743 

 742 



714 



744 

 742 



714 , 704 

 748 i 739 

 743 t 740 



720 



700 

 731 



701 

 738 

 749 



709 I 717 

 749 751 



760 763 



715 

 747 

 757 



717 

 748 

 757 



Table IV. 



— Cont 



inued. 



Hourly Normals of the "V 



'ertical Component 



[N 1844 











The observations were made 23^" 



after the full hours. 









1844. 



0" 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



ll" 



Januarv 



733 



739 



730 



728 



732 



733 



732 



732 



730 



725 



■ 720 



713 



I'Vliruary 



734 



729 



725 



726 



729 



728 



729 



730 



723 



724 



722 



717 



March 



768 



761 



763 



760 



764 



762 



765 



762 



758 



761 



762 



764 



.April 



776 



773 



771 



765 



766 



765 



759 



755 



.<749 



749 



744 



740 



May 



772 



769 



766 



768 



767 



764 



760 



754 



749 



747 



747 



744 



June 



776 



772 



767 



768 



767 



764 



760 



755 



747 



745 



744 



744 



July 



816 



811 



804 



806 



805 



802 



798 



793 



784 



783 



782 



780 



August 



794 



790 



786 



781 



783 



777 



776 



769 



763 



760 



756 



754 



September 



816 



815 



813 



812 



811 



810 



809 



805 



798 



795 



790 



785 



October 



775 



771 



769 



773 



776 



779 



780 



780 



774 



773 



773 



770 



November 



775 





768 



769 



772 



771 



770 



773 



768 



772 



772 



767 



December 



754 



753 



754 



755 



757 



756 



755 



758 



749 



751 



750 



746 



1844. 



Noon. 



13 



14 



15 



16 



17 



18 



19 



20 



21 



22 



23" 



January 



715 



708 



715 



724 



737 



740 



741 



743 



744 



745 



744 



744 



Fijbrnary 



718 



716 



716 



720 



727 



731 



738 



739 



7411 



737 



735 



733 



Marcli 



762 



753 



758 



760 



754 



757 



753 



754 



752 



753 



763 



764 



.\piil 



737 



733 



737 



741 



745 



744 



756 



767 



768 



765 



767 



775 



May 



744 



740 



747' 



744 



746 



748 



754 



763 



766 



766 



768 



772 



June 



742 



739 



744 



747 



749 



754 



760 



769 



771 



770 



771 



775 



July 



780 



776 



773 



781 



783 



791 



799 



805 



808 



809 



811 



816 



August 



750 



750 



746 



759 



764 



771 



778 



789 



790 



789 



792 



794 



September 



780 



779 



772 



794 



793 



795 



806 



813 



812 



812 



814 



817 



October 



769 



766 



773 



777 



786 



788 



701 



789 



785 



785 



781 



781 



November 



766 



763 



762 



765 



774 



779 



777 



778 



774 



770 



769 



772 



DeceiubBr 



743 



733 



736 



724 



748 



757 



755 



751 



751 



748 



750 



750 



