138 ~ ABSTRACTS FOR THE MAGNETIC DECLINATION. 
TABLE IV,—The Yearly Decrease of Westerly Declination, as Deduced from the Four Daily Observations in 
the Five Months of 1841 and 1842. 
Mean of the 
fonth. 20%, 234, 5 6 
Men Four Hours. 
July 
August 
September 
October 
November 
Means 
If the results for July and August be rejected, the mean of the other three months will be 3740. 
TABLE V.—The Extreme Readings of the Declinometer for each Month from the Four Daily Observations. 
North End of Magnet Farthest 
Month. E. Ww. 
Gottingen nae Gottingen 
Meanie: Declination. 
Meanehemer Declination. 
1841. doh m Ba a bh m o 7 
July 12 20 0 25 21-80 15) -2)20 25 41-29 
August 11 20 0 25 26-81 23 20 O 25 50:30 
September 8 20 0 25 22-64 25 2 0 25 53-14 
October 1220 0 25 21-67 24 20 0 25 45-59 
November 24 20 0 25 25:58 | 5 2 0 25 49-77 
1842. 
January 27 20 0 25 25:30 || 29 2 0 25 33-31 
February ip BO) 25 18-15 Tey MG) 25 40-52 
March 9 5 0 25 21-23 30 2 0 25 42-80 
April 24 20 O 25 20-85 14 20 0 25 52-33 
May 18 20 0 25 21-38 | 16 5 0 25 49-71 
June 220 0 25 19:92 | 10 2 0 25 40-63 
July 20 20 0 25 20-93 210 25 38-01 
August 16 20 0 25 20-15 423 0 25 38-92 
September 25 20 0 25 22.20 22 2 0 25 40-23 
October 17 5 0 25 16-43 8) 20 25 36-80 
November Lie 75) 0 25 22-44 10 2 0 25 38-37 
December Sees 25 18-83 30 2 0 25 31-76 
The range of the five months of 1841 from the Daily Observations is 31’-5. The Westerly Declination being 
least in October, 8°4 below the mean of the month; and greatest in September, being 20°9 above the mean of 
the month. 
The range for 1842 is 35°9. The Westerly Declination being least in October, 109 below the mean of 
the month ; and greatest in April, being 189 above the mean of the month. 
