304 
LIEUT.-COLONEL SYKES’S DISCUSSION OF METEOROLOGICAL 
Range of Barometer at Dodahetta. 
An inspection of the above Tables shows that the range of the daily pressure, on 
the whole, had been very regular. The minimum oscillation was 0’08 on the 25th 
of July, although on the preceding and following days it was respectively 0'059 and 
0'069 ; on the 25th of July 0T8 of rain fell, but the oscillation was only O' 16 on the 
10th of June, on which day no rain fell, and the wet bulb was depressed 3°'6 in the 
morning and 1° in the afternoon. There are two other instances in which the diurnal 
oscillation was less than three hundredths, — on the 11th of April '022, and on the 
3rd of June *026. The maximum oscillation occurred on the 16th of June, and was 
*144. The preceding day it was '102, but the following day it was only '040. On the 
18th of March it was '102, on the 1st of March *094, and on the 19th of February 
'092 ; with these few exceptions of maxima and minima in diurnal oscillation, the 
daily range of the barometer was from '040 to '060, showing no violent atmospheric 
changes. The maximum pressure was on the 17th of March, and was 22'218 in., and 
the minimum on the 23rd of June, when the barometer stood at 21*800, although 
only *09 of an inch of rain fell on that day, and little for several days before. The 
extreme annual range of the barometer, therefore, was only *418, or less than half 
an inch. I have shown, in my former paper in the Philosophical Transactions, that 
the annual range in the Deccan, at 1800 feet above the sea, was only '672 in 1830, 
from 28'242 in. in January to 27*570 in July, the difference of the thermometer at 
the extreme periods being only 1°'4; and in no instance, on comparing the maximum 
pressure of one year with the minimum pressure of any other year, did the difference 
amount to eight-tenths of an inch. In Goldingham’s tables at Madras, for twenty- 
one years, the greatest range in any year (with the single exception of a terrific storm 
in May 1820) appears to have been '960 in 1818. In the more careful observations re- 
corded by Capt. Ludlow at the Madras Magnetic Observatory, from 1841 to 1845 both 
inclusive, taJien hourly, the maximum range in 1842 (the observations for 1841 being 
imperfect) was from 30*156 at forty-one minutes past 9 a.m. on the 5th of December, 
to 29*454 on the 1st of June at 3*^ 41“ p.m., and 29*455 on the 3rd of June at 4^ 41“ 
P.M., the range being 0*702 of an inch, the standard thermometer at the maximum 
pressure being 80°*6, and at the minimum 97°*3. In 1843 the maximum pressure was 
30*208 on the 24th of January at 9^ 41“ a.m., and the minimum on the 21st of May 
being 29*256 at 3** 41“ a.m., the range therefore 0*952; the thermometer at the maxi- 
mum 81°*2, and at the minimum period 77 ° 8“. In 1844 the maximum, pressure was 
on the 16th of January, i.e. 30°*170 at 9^ 41“ a.m., and the minimum on the 1st of 
June, at 4^ 41“ p.m., i. e. 29*537, the range therefore 0*633, the thermometer at the 
first period being 79°*5, and at the second 89°*8. In 1845 the maximum pressure 
was on the 10th of January, 30°*196 at O'* 41“ a.m., and the minimum on the 31st 
of May, 29°*531 at 4^* 41“ p.m., the range therefore 0*665 : the thermometer at the 
maximum period was 79°*9, and at the minimum it was 101°*5. The following 
Table shows the extreme range of pressure at Madras, Bombay, Calcutta, &c. 
