1843.] Law of Storms in India. 373 



vations are corrected for temperature to 32 cleg. F., and for capillary 

 attraction : — 



October 



24th 



25th 



26th 



27 th 



28th 



29th 



Mean of 24 hours' observation, .. 

 Maxima, 



29.720 

 29.810 

 29.664 



.699 



.788 

 .620 



.643 

 .712 



.659 



.626 

 .675 

 .573 



.665 

 .722 

 .609 



.732 



.791 



Minima, 



.691 



















Range during 24 hours, .... 146 188 053 102 113 100 



From this it will be seen that the day of greatest mean, as well as 

 of greatest minimum, depression, was the 27th ;* the day of least range, 

 when the ordinary bi-diurnal fluctuations of the barometer were most 

 affected was the 26th, when the range was about half what it ought 

 to have been, the interval betwixt the maximum and minimum being 

 only .053. The Madras papers give the barometric readings uncor- 

 rected, and do not note the temperature so as to enable us to apply 

 the correction, whereby we should have been enabled to give an exact 

 comparison of the fall of the instruments here when the influence of 

 the storm reached us, but nothing more, as compared with that of the 

 Madras barometers where it was raging round. It must be kept in 

 mind that at 10, or rather at 9-45 a. m., the barometer is at its maxi- 

 mum, and at 4 p. m. it is at its minimum elevation, and that in the 

 finest weather the range betwixt these two hours amounts to about 

 .150. On the 24th ult. it stood at Madras, at the first named of these 

 hours, at 29.873; and at the second, at 29.7054: so that the total de- 

 pression amounted to 1626, or to about one-hundredth of an inch over 

 the average. The mean of 700 hourly observations during the month 

 of September gives .094, as the average range at Bombay betwixt the 

 hours of 10 a. m. and 4 p. m. ; the depression at the former of these 

 corrected, as formerly stated, 29.676, that, at the latter, being 29.582. 

 If these circumstances be overlooked, the barometer will appear to be 

 on the rise or fall just as it happens to be examined, not more than 

 five hours before or after 10 a. m. or p. m., the hours of maximum 

 elevation. Were vessels, when in port, any where in the neighbour- 

 hood of a meteorological observatory, to have their barometers and 

 sympiesometers corrected and rated by some recognized standard, it 

 would greatly enhance their value as monitors of approaching storms, 

 and enable meteorologists to avail themselves of the logs and records 

 kept at sea, to an extent which at present it were vain to attempt. 



* It will be noted also that this 26th and 27th was the day on which the Lucy 

 Wright's storm was nearest to Bombay. — H. P. 



