Abstracts for the Vertical Force. 



151 



TABLE ^1^\.— continued. 



Month. 



Balance Magnetometer. 



Range. 



Lowest. 



Highest. 



Gottingen 

 Mean Time. 



Reading. 



Gottingen 

 Mean Time. 



Reading. 



1842. 



d. h. m. 



Mic. Div. 



d. li. m. 



Mic. Dir. 



Mic. Div. 



January 



19 12 40 



9720 



20 9 58 



10381 



66-1 



February 



25 20 10 



937-6 



26 28 



973-3 



35-7 



March 



23 12 58 



574-9 



23 10 4 



991-2 



416-3 



April 



20 16 28 



783-9 



21 5 28 



1024-4 



240-5 



May 



27 13 34 



844-6 



27 18 52 



921-1 



76-5 



June 



22 15 28 



787-1 



23 7 52 



953-7 



166-6 



July 



20 13 16 



825-2 



21 7 52 



896-6 



71-4 



August 



26 13 52 



764-9 



26 10 4 



854-8 



89-9 



September 



21 13 46 



716-5 



22 4 58 



871-2 



154-7 



October 



19 13 46 



772-8 



19 20 52 



856-3 



83-5 



November 



25 16 52 



785-6 



26 2 16 



824-5 



38-9 



December 



20 22 28 



760-6 



1 21 3 52 



807-0 



46-4 



The range of the Term-Day Observations in 1841 is about 0'00516, in parts of the whole Vertical Force. 



The greatest force occurs in October, being 0-00168 above the mean of the month ; the least occurs in August, 

 being 0'00348 below the mean of the month. 



In 1842, the range is about 0'00644, in parts of the whole Vertical Force. 



The greatest force occurs in April, being 0-00130 above the mean of the month ; and the least in March, 

 being 0-00514 below the mean of the month. 



TABLE XXII. — The greatest and least Headings of the Balance Magjnetomer durinor Extra Observations for each 



Month in which Extra Observations were made. 



Month. 





Balance Ma 



jnetometer. 





Range. 



Lowest. 



Highest. 



Gottingen 

 Mean Time. 



Reading. 



Gottingen 

 Mean Time. 



Reading. 



1841. 



d. h. m. s. 



Mic. Div. 



d. h. m. s. 



Mic. Div. 



Mic. Div. 



August 

 September 

 1842. 



20 22 57 30 

 25 6 1 30 



789 



20 22 47 30 

 25 4 6 30 



793 



4 

 451 



699 



1150 







May 



25 3 26 



890 



16 5 23 



1166 



276 



July 



2 11 48 



160 



2 53 



1200 



1040 



August 



16 20 36 



781 



19 4 58 



1229 



448 



September 



20 19 58 



814 



2 3 34 



995 



181 



October 



17 4 58 



821 



17 5 40 



871 



50 



November 



21 19 56 



691 



3 7 56 



955 



264 



December 



5 20 52 



744 



9 7 4 



964 



220 



The range of the observed portion of the disturbance September 1841, is 0-00685 ; the greatest force being 

 0*00526 above, and the least O'OOOGO below, the mean of the month. 



The rano-e of the disturbances of 1842 is 0-01405. 



The least force occurs in July, being 00091 9 below the mean of the month ; the greatest occurs in August, 

 being 0-00486 above the mean of the month. 



The range of all the observations in 1841 is about 0*00982 ; the lowest occurring in the August term, being 

 0*00348 below the mean of the month, and the highest on October 25, being 0-00634 above the mean of the month. 



The range of all the observations in 1842 is that of the disturbances given above. 



