Absteacts for the Vertical Force. 



149 



TABLE XIX. — The Means of the Balance Magnetometer Readings minus the least Mean, in parts of the whole 

 Vertical Force, for periods of Three Months, in 1841 and 1842, for the Summer and Winter Months, and 

 Year of 1842. 



Periods. 



sot. 



23i>. 



Sh. 



Sh. 



Mean. 



Range. 



1841. 

















July, Aug., Sept. 

 Oct. and Nov. 

 1842. 





000000 



0-00006 



0-00006 



000037 





0-00037 

 0-00029 



000000 



0.00008 



000012 



000029 











Jan., Feb., March 





0-00211 



0-00222 



000215 



0-00225 



0-00218 



0-00014 



April, May, June 





0-00146 



0-00137 



000130 



0-00165 



000144 



0-00035 



July, Aug., Sept. 





000080 



000065 



000062 



0-00095 



000075 



0-00033 



Oct., Nov., Dec. 





0-00000 



000012 



0-00016 



000027 



0-00014 



0-00027 



Jan., Feb., March, 

 Oct., Nov., Dec. 



} 



0-00105 



0-00117 



000115 



0-00126 



0-00116 



0-00021 



April, May, June, 

 July, Aug., Sept. 



} 



0-00113 



0-00101 



000096 



0-00130 



0-00109 



0-00034 



The Year 





000109 



000109 



000106 



0-00128 



0-00113 



0-00022 



The means for July, August, and September 1841, indicate a maximum before 23^, and a minimum before 

 S** ; the means of October and November 1841 still indicate a maximum before 23'\ and a minimum before 2*', 

 but it is much less evident. 



In the first quarter of 1842, a maximum at 23*^, and a minimum at 2**, are well indicated ; in the second and 

 third quarters, only the minimum before 2'' is evident, but a maximum in both cases probably occurs between 20"* 

 and 23^^. 



The last quarter of 1842 has the same character as that for 1841. 



The means for the winter months shew a maximum before 23^^, and a minimum nearer 2^^ than 23*^. The 

 means for the summer months shew the minimum about the same time as in the winter months, but the maximum 

 earlier. The means for the year 1842 shew a maximum between 20'^ and 2^, and a minimum about 1*^. 



In forming the above Table k was taken = 0'000013. 



TABLE XX. — The greatest and least Readings of the Balance Magnetometer for each Month from the Daily 



Observations. 



Month. 



Balance Magnetometer. 



Range. 



Lowest. 



Hig 



best. 



Gbttingen 

 Mean Time. 



Reading. 



Gbttingen 

 Mean Time. 



Reading. 



1841. 

 July 



August 



September 



October 

 November 



d. h. 



19 20 



26 20 

 24 20 



20 20 

 3 20 



Mic. Dir. 



733-2 



d. h. 



17 5 



6 5 



25 2 



25 2 

 20 2 



Mic. Div. 



916-7 



Mic. Div. 



183-5 

 200-0 

 351-2 



631-2 



242-9 



707-0 



9070 



639.0 



990-2 



549-9 

 526-6 



1181-1 

 769-5 







MAG. AND MET. OBS. VOL. I. 



2p 



