Xvill INTRODUCTION TO THE MAKERSTOUN OBSERVATIONS, 1847 To 18565. 
seale divisions, corrected for temperature to 26° Fahr. The bifilar is observed 2™ 
after the declination magnetometer. 
The fourth column gives the reading of the balance magnetometer in micro- 
meter divisions, corrected for temperature to 26° Fahr. It is observed 3™ after 
the declination magnetometer. 
During the year 1847, five daily observations of magnetometers were made, 
viz., at 8 a.M., ll am., 2PM, 5 P.M, 8 P.M. Gottingen mean time; these observa- 
tions extend from page 1 to page 7. As it would have occupied too much space to 
have given the temperatures of the bifilar and the balance magnetometer sepa- 
rately for each observation hour, the means of the temperatures of both for the 
hours 8 A.M. and 5 P.M. are given in the last two columns. 
From January 1848 to February 1850, only two daily observations of magne- 
tometers were made, viz., at 11 am. 5 p.m. Gottingen mean time; these observa- 
tions extend from page 8 to page 14. 
Here the means of the temperatures of the two magnetometers are given for 
both the observation hours. 
From February 1850 to December 1855, there were four daily observations of 
magnetometers, viz., at 8 A.M., 11 A.M., 2 P.M., and 5 p.m. Gottingen mean time; 
these extend from page 14 to page 47. Here the mean temperatures of the two 
magnetometers for all the observation hours are given in the last four columns. 
Daily Meteorological Observations, 1847 to 1855 (pp. 49-101). 
The first column contains the civil day ; the second gives the calculated daily 
means of atmospheric temperature which have been obtained in the following 
manner :—During the years 1844, 1845, hourly observations of temperature were 
made, and during the years 1843 and 1846 nine observations were made daily. 
On the basis of these four years’ observations, the following Table (similar in 
principle to Table 75, p. Ixxxvi. General Results of the Makerstoun Observations) 
has been constructed, showing for each month the correction that requires to be 
applied to an observation made at any hour of the day in order to obtain the mean 
temperature of the day. 

