hi INTRODUCTION. 
77. In the daily observations 1842, the bifilar magnetometer was observed 
2 minutes after, and the balance magnetometer 2 minutes before, the minute of 
declination observat-on. 
During the term-day observations 1842, the bifilar magnetometer was ob-, 
served 2 minutes after, and the balance magnetometer 4 minutes after, the minute 
of declination observation. 
78. The following is the arrangement of the observers on the term-days. 
TABLE 26.—Initials of Observers for each Hour of the Term-Days, from July 1841 till 
December 1842. 
Gottingen 
Hour. 
August 
September 
December. 
February. 
April 
May. 
June 
October. 
November. 
December. 
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BHR RR RHP ee ees 
PRA HE HHS RR Ree ere as 
PHHR RAPA er PrP reese eR Ree as 
SURPNP RR PrP Re eee deed ee oeP PPP | September. 
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The names of the observers to whom the initials belong will be found, § 2. 
79. The absolute westerly declination is to be obtained from the observations 
by adding 24° 20’, or by deleting the unit in the hundreds place, and prefixing 25°, 
80. All the readings of the bifilar and balance magnetometer, are corrected for 
temperature by the quantities given in Tables 11 and 18; 300 scale divisions being 
added to all the bifilar readings. 
* Mr Watxace, of the Edinburgh Observatory. 
