146 ABSTRACTS FOR THE VERTICAL FORCE. 
TABLE XVI.—The Monthly Means of the Balance Magnetometer Readings, Corrected by a new value of q, 
for the Hours 20, 23, 2, and 5. 
Range from the Four 
Mean of the Hours for 
Month. Four Hours. 
Each Month. | Two Months, 
Mic, Div. Mic. Div. 
58-1 
August : : : Y 22-6 
September . : : ; 55-4 
October : 5 . : : 78-7 
November . : : 5 . 43.9 
1842. 
January 
February 
March 
April 
May 
June 
July 
August 
September 
October 
November 
December 
The means for 1841 are not comparable with those for 1842; and of the months in 1841, only October and 
November are comparable with each other. 
In the five months of 1841, the lowest reading is shewn at 20}, the highest at 5°; in August 1841, there 
is a maximum at 234, and a minimum at 2". The force increases in the remaining four months from 20? till 5. 
In July, a minimum seems to occur after 204; and in September, the force increases but slightly from 23% till 25. 
In 1842, the highest reading is at 5". In January, February, and March, a maximum occurs about 23, 
and @ minimum about “gh the Towaat readings in these three months is at 205. 
In April, and the last four months of the year, the readings increase from 20° till 5%. 
In May @ minimum occurs about 0", in June about 0%, in “Tuly and August about 235, The minimum thus 
seems to shift from January till June, and from June till December, occurring probably before 20" in the winter, 
and about 1" in midsummer. 
The means of the four hours shew a continued diminution of the vertical force, which is irregular from 
month to month. 
The ranges for each month, and for each two months, are irregular ; they shew, on the whole, an increase of 
range in the summer compared with the winter months. 
The following Table has been formed from the above. 
