OF THE MAGNETIC FORCE. 



43 



Normals of the Vertical Force for June. 



Year. 



0>' 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



lit 



1841 

 1842 

 1843 

 1844 

 1845 



646 

 674 

 698 

 776 

 733 



772 

 731 



631 

 669 

 691 

 767 

 729 



768 

 730 



622 

 664 

 693 

 767 

 729 



764 

 728 



617 

 658 

 687 

 760 

 726 



755 

 722 



624 

 647 

 677 

 747 

 717 



745 

 715 



616 

 642 

 668 

 744 

 715 



744 

 711 



Means 



705 





698 





695 





690 





683 





677 





1 



Noon 



13 



14 



15 



16 



17 



18 



19 



20 



21 



22 



23'> 



Min. 



603 

 635 

 663 

 742 

 711 



739 

 711 



624 

 639 

 658 

 744 

 713 



747 

 714 



635 

 635 

 659 

 749 

 713 



754 

 714 



650 

 653 

 669 

 760 

 722 



769 

 730 



653 

 671 

 681 

 771 

 735 



770 

 731 



657 

 668 

 689 

 771 

 731 



775 

 733 



+23J- 

 +23i 



671 





675 





678 





691 





702 





703 





+21.0 



Table I.- 



-Recapitulation of the 



Bi-HOURLY Normals of 



the Vertical Force (expressed 







I^ 



Scale Divisions) 



FOR EACH Month of the 



Year 















Increase of scale readings denotes decrease of force. 









1841-5. 



0" 



2 



4 



6 



8 



10 



Noon 14 



16 



18 



20 



22'' 



(+20».6) 



January 



716 



707 



713 



7!5 



715 



709 



709 



705 



717 



724 



721 



719 





February 



718 



711 



716 



717 



709 



705 



704 



700 



706 



720 



722 



716 





March 



709 



701 



705 



707 



701 



700 



696 



694 



703 



709 



708 



710 





April 



712 



705 



705 



702 



696 



693 



693 



691 



694 



702 



711 



711 





May 



706 



704 



700 



692 



686 



685 



683 



680 



684 



693 



703 



706 





June 



705 



698 



695 



690 



683 



677 



671 



675 



678 



691 



702 



703 





July 



722 



717 



712 



703 



698 



692 



687 



688 



693 



706 



717 



721 





August 



718 



715 



712 



706 



700 



691 



681 



686 



693 



704 



715 



718 





September 



723 



718 



717 



715 



.706 



699 



693 



693 



698 



708 



717 



719 





October 



694 



689 



691 



694 



684 



685 



685 



685 



692 



697 



699 



697 





November 



691 



691 



694 



693 



688 



686 



682 



683 



690 



692 



693 



693 





December 



703 



697 



699 



703 



700 



697 



695 



695 



7(14 



710 



707 



705 





Year . . 



709.7 



704.5 



704.9 



703.1 



697.2 



693.2 



689.9 



689.6 



696.0 



704.7 



709.6 



709.8 





Summer . 



714.3 



709.7 



706.8 



701.3 



694.8 



689.5 



684.7 



685.5 



690.0 



700.7 



710.8 



713.0 





Winter 



705.2 



699.3 



703.0 



704.8 



699.5 



697.0 



695.2 



693.7 



702.0 



708.7 



708.3 



706.7 





The months from April to September inclusive comprise the summer half year, 

 those from October to March inclusive the winter half year. 



Table II 



. — Mean Values of the Normals for eaci 



Month and Season 





1841-45. 



1841-44. 



1 



1841-45. 





January .... 

 February .... 

 March ..... 



April 



May 



June 



714.2 

 712.0 

 703.6 

 701.3 

 693.5 

 689.0 



July 



August ..... 

 September .... 

 October . . . . . 

 November .... 

 December .... 



704.7 

 703;3 

 708.8 

 691.0 

 689.7 

 701.2 



Year 



Summer .... 

 Winter 



701.0 

 700.0 

 702.0 



