DISCUSSION OF THE VERTICAL FORCE, 



11 



Notes to preceding table: — January 2d, 10'' 23-j'°, temperature observation 30" late. January 8th, 

 lO*" 285°', instrument disturbed. January 15th, 3" 23^"", temperature 56°. 8 interpolated. February 

 6th, 4'' 23i™, and 13th, B"" 235", temperature observation 15"" and 20" late, respectively, April 

 11th, 0"" 23^" and 1'' 23^", readings supplied by observer. July 13th, 12'' 23|-", observation 36" 

 late. August 2Gth and 2Hh, thirteen readings supplied by observers. October 1st, 22'' 231^'", 

 observation 8" late. 





Table II. 



— Continued. 



Vektical Force Readings at 



66° Fah, 







1845. 



0" 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



iP 



-!-23i"> 



January 



754 



748 



749 



751 



752 



756 



762 



767 



760 



758 



753 



751 





February 



761 



756 



753 



757 



759 



760 



763 



764 



756 



756 



752 



749 





March 



749 



743 



739 



742 



745 



744 



745 



743 



735 



733 



732 



729 





April 



732 



727 



726 



728 



729 



727 



725 



724 



719 



718 



718 



717 





May 



722 



720 



718 



721 



718 



717 



715 



711 



707 



704 



702 



701 





June 



733 



731 



729 



729 



729 



727 



726 



722 



717 



715 



715 



711 







1845. 



Noon. 13 



14 



15 



16 



17 



18 



19 



20 



21 



22 



23" 



+23j™ 



January 



752 



748 



749 



739 



754 



759 



756 



753 



748 



746 



746 



753 





February 



747 



741 



740 



739 



753 



759 



761 



761 



758 



753 



752 



756 





March 



730 



729 



713 



731 



737 



741 



745 



746 



740 



740 



739 



742 





April 



716 



713 



715 



724 



726 



723 



732 



737 



735 



729 



726 



728 





May 



699 



698 



680 



700 



704 



704 



712 



719 



719 



717 



719 



720 





June 



711 



711 



711 



714 



713 



715 



722 



730 



733 



731 



731 



732 





Notes to above table: — April 27th, 4'' 23^"°, reading supplied by observer. April 14th, 2'' 235"°," 

 observation 12"" late. April 22d, 23d, and 28th, 14'' 23^"'; also April 22d, 15'' 23|", readings sup- 

 plied by observer. April 22d, 16'' asl"", temperature supplied by observer. May 2d, 14'' 23^"", 

 reading supplied by observer. May 12th, 4'' 23^'°, 9"" late. June 6th, b'^ 23^"°, and 28th, 1'' 23^"', 

 observations 1.3"" and 9" late, respectively. June 12th, 0'' 23^"" and 1'' 23^", readings supplied by 

 observer. 



Table III.— Mean Monthly Readings of 

 THE Vertical Force reduced to the Tem- 

 perature OF 66° Fah. 





1841. 



1842. 



1843. 



1844. 



1845. 



January 



February 



March 



April 



May 



June 



July 



August 



September 



October 



November 



December 



858 

 945 

 993 

 1022 

 631 

 688 

 670 

 648 

 572 

 535 

 603 



661 

 705 

 661 

 656 

 654 

 654 

 669 

 676 

 685 

 706 

 716 

 710 



699 

 702 

 684 

 705 

 686 

 678 

 678 

 690 

 708 

 710 

 742 

 744 



733 

 731 

 757 

 756 

 756 

 762 

 792 

 776 

 799 

 779 

 770 

 751 



752 

 754 

 738 

 725 

 710 

 722 



Mean 





679 



702 



763 





The monthly mean for January, February, and March, 1843, was obtained by adding 14, 10, and 8 

 divisions to the readings at 14'' 7"" respectively; these corrections were found by comparisons in 

 1842 and 1844. 



