Absteacts for the Vertical Force. 



145 



TABLE XV. — Containing the Monthly Means of the Balance Magnetometer Readings, as Corrected in this 



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



Month. 



20". 



as". 



2". 



5". 



Range from the 

 Four Houvs. 



1841. 



Mic. Div. 



Mic. Dlv. 



Mic. Div. 



Mic. Div. 



Mic. Div. 



July 

 August 

 September 

 October 



738-3 



744-6 



765-7 



784-8 



46-5 

 17-3 

 44-5 

 70-2 



715-4 



715-8 



707-1 



724-4 



659-9 



676-2 



677-8 



704-4 



629-7 



655-2 



681-6 



699-9 



November 

 1842. 



621-8 



641-8 



645-2 



655-9 



34-1 











January 



[948-0 

 (938-1 



961-8 

 956-0 



941-4 

 935-0 



949-2 

 937-5 



20-4 

 21-0 



February 



907-4 



918-8 



907-2 



921-8 



14-6 



March 



|882-9 



887-7 



864-9 



878-4 



22-8 





1880-5 



891-3 



885-4 



900-6 



20-1 



April 



[859-9 

 (868-4 



886-1 

 867-1 



907-5 

 848-8 



924-7 

 870-1 



64-8 

 21-3 



May 



858-0 



841-6 



837-9 



845-2 



20-1 



June 



820-0 



815-2 



801-6 



812-4 



18-4 



July 



783-3 



772-8 



777-2 



814-9 



42-1 



August 



774-3 



768-4 



764-4 



793-9 



29-5 



September 



769-6 



778-4 



781-1 



795-9 



26-3 



October 



|769-1 



776-7 



769-1 



775-9 



7-6 





(755-5 



769-3 



760-6 



771-8 



16-3 



November 



731-4 



747-6 



747-1 



750-9 



19-5 



December 



705-2 



710-1 



709-4 



709-4 



4-9 



None of the months in 1841 are comparable with those of 1842; and only October and November in 1841 

 are comparable with each other. Those months for which two values of T (the time of the Balance needle's vibra- 

 "I tion in a vertical plane) are used, have the means of the readings corrected according to each value of T given 

 separately. 



Another value of q having been obtained from the Daily Observations in 1843-4, has been applied, and the 

 following Tables formed. 



MAG. AND MET. DBS. VOL. I. 



20 



