302 CAPTAIN ELLIOT’S MAGNETIC SURVEY OF THE INDIAN ARCHIPELAGO. 
Table B. 
From page Ivi to Ixxxv are contained the results of the bifilar at each of the sixteen 
stations in the Archipelago ; the stations are given from the most northern proceeding 
to the most southern, the observations themselves being omitted. 
At the top of each page is printed the name of the station and the astronomical time ; 
then follow the coefficients, the value of one scale division, and the value of q (the 
change of magnetic moment of the magnet for 1° of temperature in terms of the 
force) ; X the value of the absolute horizontal intensity ; the zero of the month, which 
is the mean of the month uncorrected; and the standard temperature, to which the 
mean of the month is corrected. The results of the bifilar at each station are given 
in horizontal columns : the first contains the sums of the scale readings ; the second 
the means ; the third the temperature correction to the lowest mean reading of the 
thermometer ; and as increasing scale readings denote a decrease of force, the correc- 
tions will be all subtractive ; the fourth contains the corrected means ; the fifth con- 
tains the variation of the force in scale readings, the highest scale reading being the 
minimum of force and considered as 0 ; and the sixth contains these scale divisions 
in terms of the force, one scale division being =*0002402 of the force. The last ver- 
tical column, or is retained, since it is the difference between the zero and the 
mean value of the daily means corrected to 80°. Immediately below this table is given 
the mean results of the thermometer, the bulb of which is inserted in the copper box 
containing the bifilar magnet ; the first column includes the sums ; the second the 
means ; and the third column the differences from the lowest mean temperature. 
Curves. 
Part 1 of Plate VII. contains the curves of the Bifilar at the Singapore Observatory 
for each month of the year in scale divisions, each scale division being *000197 of 
the force drawn to 0*35 of an inch. 
Part 2 of Plate VII. is drawn to the same scale, and contains the mean of the four 
seasons, the mean of each year, and the general mean of the three years. The general 
march of these curves is exceedingly simple, having but one single progression ; the 
maximum occurs at either 22 or 23 hours, the autumn and winter curves having gene- 
rally their maximum at the former, the spring and summer curves at the latter hour. 
The minimum occurs at 10 or 1 1 hours, the minimum in autumn and in winter being 
likewise one hour earlier than the minimum in spring and summer; the extreme 
range in spring and autumn being greater than in summer and in winter. 
Plate VIII. contains the curves at the stations where the portable bifilar was 
observed ; three stations having been omitted, as the curves of these instruments 
observed but for a few days would cause some confusion by crowding the Plate : there 
appears to be exactly the same similarity observable between these and the Singapore 
curves to which they are referred, the maximum occurring sometimes as late as noon ; 
