144 



Abstracts for the Horizontal Force. 



TABLE XIII. — continued. 





Bifilar Magnetometer. 





Lowest. 1 



Highest. 



Month. 











Range. 



Gbttingen 





Gbttingen 







Mean Time 



Reading. 



Mean Time. 



Reading. 





1842. 



d. h. m. 



Sc. Div. 



d. h. m. 



Sc. Div. 



Sc. Div. 



January- 



19 22 2 



498-8 



19 12 38 



515-4 



16-6 



February 



26 8 



50M 



26 4 56 



517-4 



16-3 



March 



23 13 2 



463-7 



24 8 38 



558-3 



94-6 



April 



20 16 2 



4550 



21 5 26 



538-6 



83-6 



May 



27 23 20 



508-5 



28 6 8 



536-3 



27-8 



June 



22 21 20 



497-7 



23 8 8 



553-1 



55-4 



July 



20 23 8 



507-9 



21 3 38 



533-5 



25-6 



August 



26 22 56 



507-0 



27 6 38 



539-4 



32-4 



September 



21 22 26 



503-6 



22 7 32 



564-3 



60-7 



October 



19 22 50 



514-7 



19 11 2 



562-8 



48-1 



November 



25 22 14 



522-4 



25 15 44 



537-7 



15-3 



December 



20 20 56 



529-1 



21 5 44 



537-3 



8-2 



The range, in parts of the whole horizontal force of the five terms of 1841, is about 0-01060, The greatest 

 and least occurring in the October term, being 0-0571 below, and 0-00489 above the mean of the month in Table X. 



The range of the terms of 1842 is 0-01242. The least being 0-00696 below the mean of the month in 

 April ; and the greatest 0-00546 above the mean of the month in September. 



TABLE XIV. — The lowest and highest Readings of the Bifilar Magnetometer during Extra Observations for 



each Month, in which Extra Observations were made. 





Bifilar Magnetometer. 





Lowesi 





Highest. 



Month. 











Range. 



Gottingen 

 Mean Time. 



Reading. 



Gottingen 

 Mean Time. 



Reading. 



1841. 



d. , h. m. s. 



So. Div. 



d. h. m. 8. 



Sc. Div. 



Sc. Div. 



August 



20 22 42 30 



517-9 



20 23 2 30 



520-7 



2-8 



September 

 1842. 



25 6 58 55 



629-8 



25 4 23 55 



903-7 



273-9 







May 



16 6 39 



528-8 



16 5 2 



555-4 



26-6 



July 



2 11 47 



273-1 



4 2 



62M 



348-0 



August 



5 23 2 



479-8 



19 5 2 



5740 



94-2 



September 



20 19 32 



498-7 



20 7 38 



567-3 



68-6 



October 



17 20 2 



519-9 



17 5 26 



545-3 



25-4 



November 



21 20 2 



492-2 



19 6 44 



537-2 



45-0 



December 



9 8 26 



496-2 



5 20 38 



545-8 



49-6 



The range of the observed portion of the disturbance, September 1841, is 0-04163 ; the lowest being 0-01207 

 above, and the highest 0-05370 above the mean of the month. 



The range of the observed disturbances of 1842 occurs in July, and is 0-04350. The lowest being 0-03059 

 below, and the highest 0-01291 above the mean of the month. 



The range of all the observations in 1841 is about 0-06130. The lowest being in the Daily Observation, 

 November 18. = 0-00760 66^0^ the mean of the month ; the highest 0-05370 abovethe mean of the month, occurs 

 in the disturbance September 1841. 



The range of all the observations in 1842 occurs in the July disturbance given above. 



