1884.] 



of tie 'Bay of Bengal in 1883. 



99 



nish as a whole the intensity and amount of the cyclonic motion, and, 

 therefore, also of the depression at the centre, which roughly measures 

 the intensity of the disturbance. 



The observations taken at 4 p. m. in the neighbourhood of the centre 

 are given in the following table : — 



Station. 



O S c^ 



PQ 



o 



Wind. 



p-s 



Amount in 



miles per 



hour since 



10 A. M. 



o cS 

 o 



Sangor Island 



Burdwan 



Hazaribagh .., 



Sutna 



Jubbulpore . . . 



Seoni 



Nagpur 



Kaipore 



Sambalpore ... 

 Cuttack 



29-508 

 •516 

 •446 

 •533 

 •538 

 •543 

 •546 

 •415 

 •215 

 •395 



+ -371 



+ •m 



— •001 

 + ^013 



— 033 



— •038 

 + -007 



— •084 



— •122 

 + ^029 



S. E. 



S. E. 



E. 



E. N. E 



N. W. 



W. N. W. 



N. W. 



W. 



s. w. 



W. N. W. 



20-0 

 120 

 22-9 

 24-5 

 24-8 

 24-4 

 12-2 

 600 

 1-5 

 65-0 



10 



9 



10 



6 



10 



5 



10 



10 



10 



10 



In comparing these observations with the preceding 10 A. M. obser- 

 vations, it should be remembered that the fall of the barometer between 

 10 A. M. and 4 p. m., due to the diurnal oscillation, is •ll" during the 

 months of June and July in the Central Provinces. Hence, making 

 allowance for this, it will be seen that the barometric changes due to the 

 storm were of the following character. Pressure had increased about ^08'' at 

 Cuttack and •ll" at Hazaribagh, and had fallen •OS" at Sambalpore. It 

 had, consequently, risen during the previous six hours at all stations in 

 the immediate neighbourhood of its centre, except Sambalpore, the near- 

 est station. These facts appear to establish in this case that which I 

 believe, from an examination of other similar cyclonic disturbances, to 

 be a general result of the advance of a storm over a hilly country, viz., 

 that the storm tends to break up, the cyclonic motion becoming more 

 irregular, and the barometric depression smaller in amount over the 

 greater part, if not the whole, of the area of cyclonic circulation, but fre- 



