Abstracts for the Horizontal Force. 



141 



TABLE IX. — The Monthly Means of the Bifilar Magnetometer Scale Readings, Corrected hy a new value of q, 



for the Hours 20, 23, 2, and 5. 



Month. 



201'. 



23i>. 



21'. 



6^. 



Mean of the 

 Four Hours. 



Approximate 



Mean Daily 



Range. 



1841. 





Sc. Div. 



Sc. Div. 



Sc. Div. 



Sc. Div. 



Sc. Div. 



Sc. Div. 



July 

 August 





457-45 



450-82 



470-26 



482-54 





31-72 

 19-94 





516-26 



515-87 



526-92 



535-81 



523-71 





1 



J534-79 

 (550-63 



530-26 



543-78 



547-35 ) ] 

 379-17/ } 







September 



542-24 



562-51 









547-19 



540-24 



558-76 



572-54 ) 



554-68 



32-30 



1 



f47501 

 1487-27 



474-17 



483-07 



494-02) \ 

 499-04/ I 





October 



486-08 



506-50 









480-26 



480-12 



494-22 



496-41 ) 



487-75 



16-29 



November 





496-56 



492-98 



500-73 



501-21 



497-87 



823 



1842. 

















January 





509-23 



505-80 



513-00 



512-05 



510-02 



7-20 



February 





508-33 



505-02 



512-47 



515-60 



510-35 



10-58 



March 





509-69 



503-78 



514-81 



520-74 



512-25 



16-96 



April 





501-46 



497-49 



512-46 



523-95 



508-84 



26-46 



May 





512-82 



507-53 



519-52 



527-10 



516-74 



19-57 



June 





512-32 



507-81 



521-90 



53111 



518-28 



23-30 



July 





507-23 



505-82 



525-56 



532-15 



517-69 



26-33 



August 





512-29 



507-27 



524-26 



530-58 



518-60 



23-31 



September 





517-88 



509-94 



524-98 



528-64 



520-36 



18-70 



October 





524-91 



517-14 



528-01 



529-90 



524-99 



12-76 



November 





526-42 



523-32 



530-49 



530-86 



527-77 



7-54 



December 





532-20 



530-22 



534-37 



533-79 



532-64 



4-15 



The small type in September and October 1841 is explained for Table VII. 

 The following Tables for the Horizontal force are corrected by the new value of q. 



The rule given after Table I. for the days of irregularity to be rejected, having been applied, the following 

 Table has been formed. 



TABLE X. — The Monthly Means of the Bifilar Magnetometer Scale Readings, as Corrected in Table VIII., 



rejecting days of marked disturbance. 



and 



Month. 



SOi. 



23''. 



21". 



5h. 



Mean of the 

 Four Hours. 



Range from the 

 Four Hours. 



1841. 



Sc. Div. 



Sc. Div. 



Sc. Div. 



Sc. Div. 



So. Div. 



Sc. Div. 



July 

 August 



457-07 



454-23 



468-70 



480-84 





25-20 

 22-24 



519-50 



516-45 



528-00 



534-76 



524-68 



September 

 October 



547-59 



541-44 



553-38 



559-21 



550-40 



21-60 

 12-19 



484-10 



481-28 



487-95 



493-37 



486-67 



November 



499-64 



495-01 



499-66 



500-92 



498-81 



5-91 



1842. 















January 



508-62 



505-55 



513-36 



512-87 



510-10 



7-81 



February 



507-67 



504-91 



511-31 



515-16 



509-76 



10-25 



March 



1 509-60 



504-36 



514-72 



52011 



512-20 



15-75 



April 



50604 



501-21 



512-66 



522-92 



510-71 



21-71 



May 



512-79 



507-51 



520-32 



525-96 



516-64 



18-45 



June 



512-66 



508-50 



522-28 



530-64 



518-52 



22-14 



MAG. AND MET. DBS. VOL. I. 



2N 



