110 Meteor oloy of Bombay, by Colonel Sabine, [No. SI, 



Table II. — Bombay, 1843. Comparison of the temperature and of the 

 gaseous pressure m the months of May, June, July, and August, when 

 the sky is usually covered with clouds ; and those of November, Decem- 

 ber, January, and February, when the shy is usually nlear. 



Hours of Mean Time at 

 Bombay, Astronomical 

 Beckoning. 



Temperature. 



Gaseous Pressure. 



November, 

 December, 

 January, and 

 February. 



May, June, 

 July, and 

 August. 



November, 

 December, 

 January, and 

 February. 



May, June, 

 July, and 

 August. 



18 

 20 

 22 



A 

 U 



2 

 4 

 6 

 8 

 10 

 12 

 14 

 16 



cleg. 



74- 1* 



75- 3 



78- 1 



80- 8 

 81 9+ 



81- 7 



79- 6 

 78-4 

 769 



76- 2 

 757 

 749 



deg. 



81- 9* 



83- 1 



84- 3 



85- 1 

 85-6+ 

 85-4 

 84-3 

 83-4 

 830 

 827 



82- 6 

 82-2 



inch. 



29 344 



29-368 



29-391+ 



29-353 



29-230 



29-195* 



29-199 



29-248 



29-308 



29-316+ 



29-295 



29-285* 



inch. 

 28-782 

 28-806+ 

 28.798 

 28-782 

 28-746 

 28-724* 

 28 740 

 28-754 

 28-800+ 

 28-775 

 28-754 

 28-753* 



Means. 



77-8 



83-7 



29-298 



28763 



In addition to the monthly tables, we may therefore advantageously col- 

 lect in one view, for purposes of contrast, the means of the months of 

 May, June, July, and August, as the season when the sky is generally 

 clouded : and of the months of November, December, January, and 

 February, as the season of opposite character, when the range of the di- 

 urnal temperature is greatest, and the land and sea breezes alternate 

 regularly, and blow with considerable strength. 



These seasons are contrasted in Table II., which we have given at the 

 foot of the preceding column. 



If we now direct our attention to the diurnal variations, commencing 

 with those of the temperature, we find the projections exhibiting a single 

 progression, having a minimum at 18 h and a maximum at 2 h ; the average 

 difference between the temperature at 18 h and 2 h being 7-770° in the clear 

 season, 3-71° in the clouded season, and 5-7° on the mean of the whole 

 year ; and we perceive that the mean diurnal range of the thermometer 

 is more than twice as great in the clear as in the clouded season. 



The tension of the vapour exhibits also the general character of a single 

 progression, increasing from a minimum at the coldest hour to a maxU 

 mum about the warmest hour, and decreasing uninterruptedly from the 

 maximum to the minimum. 



* signifies 'minimum' + signifies 'maximum.' 



