1840.] and Mountains of N. W. India, Ml 



Monthly DEViATioNS of the Barometer and Thermometer from their 

 annual mean height at Calcutta; and at several other places^ introduced 

 for the sake of comparison. 



Month. 



Barometkr at 32" Fahr. 



Thekmometer. 



2. So 



'CS ^ t- 



o 



CO 

 00 



Calcutta, for 

 tliree years, 

 1829-30.31. 

 Benares, four 

 years' observa- 

 tions, 1822 tol826 



H 



2 « 



to 00 



m 



iinch. 

 + •274 

 + •219 

 + -151 

 + •061 

 -.•060 

 _-217 

 -•398 

 -•278 

 —•158 

 —•047 

 + '209 

 + •245 



QJ . 



>^ f X 



S cti a ^ 

 ^ ^1 



~ Deg. 

 —6-5 

 —4-5 

 —1-8 

 +0-7 

 +5-2 

 +7-4 

 4-3-9 

 + 3-0 

 + 2-1 

 +0^1 

 -3^1 

 -4^9 



00 ~ 

 cS 



Mi 



o- 



CO 2 



<^ 



0. o g 



S 00 



r^: '-' 

 02 



February 



March ........ 



April 



May 



June. . . c 



July 



November 



December .... 



Ann. mean , . 



Inch. 

 + •146 

 + •131 

 + •087 

 -•006 

 -•124 



— •117 



— •103 



— •088 

 -•057 

 ~ -018 



+ -GO;j 



+ •124 



Inch. 

 + •229 

 + -115 

 + •051 

 -■023 



— •105 



— •156 

 -•176 

 -•126 

 —•098 

 -•010 

 + •102 

 + •201 



Inch. 

 + -208 

 + -172 

 + •095 

 _-030 

 _'1;>2 

 — •248 

 —•218 

 —•194 

 -•115 

 + •020 

 + •161 

 + •258 



Inch. 

 + •273 

 + •175 

 + •107 



— •043 



— •1.36 



— •289 



— 308 



— •203 

 -•098 

 + •074 

 + •181 

 + •279 



Deg. 

 —13-7 



- 4-9 



- 2-8 

 + 7'8 

 + 5 6 

 + 7-1 

 + 4-4 

 + 4-1 

 -1- 4-3 

 + 2-2 



- 4-2 

 -10-1 



-11-6 

 ~ 6-0 

 + 1-0 

 + 5-1 

 + 7-5 

 + 5-5 

 + 4-6 

 + 3-6 

 + 3-7 

 + 2-5 

 — 5-4 



-irs 



Deg. 



-17-0 



—11-5 



- 1-5 

 + 9-5 

 +13-9 

 + 13-1 

 \. 6-9 

 + 6-4 

 + 5-8 

 + 1-3 



- 9-7 

 -17-6 



Deg. 

 —21.8 

 -20.9 

 + 0.1 

 + 6.1 

 +11.6 

 + 17.5 

 + 12.8 

 + 10.0 

 1-- 9.5 

 + 0.8 

 —10.8 

 —13.8 



29-810 29 •573 29-764 29-464 



28-766 



81.69 j 78-39 



78.13 



77-81j 73-5 



•370 



•405| -5061 ^587 



.672 



13-9 ) 21-5 



19-1 



31-51 39-3 



" It will be remarked, that the range of variation in the weight of 

 the atmosphere increases with the latitude, even up to the foot of the 

 Himalaya Mountains, and that it is accompanied by a corresponding in- 

 crease in the range of the thermometer. 



*' We now come to the diurnal oscillation of the barometer, for which 

 the same sources have furnished me with materials for framingr a com" 

 partitive table for five localities considerably distant from one another,- 

 we could liave added Moorshedabad to the list, but that the thermome- 

 trie series for that place was incomplete. At Saharunpore the horary 

 observations were confined to a single day, the fifteenth of each month; 

 at Madras to three similar days ; at Benares, perhaps, the hour of the 

 minimum was not always exactly observed; thus a little irregularity 

 must be expected, but on the whole the results are wonderfully 

 equable. 



