Tropical and Extra-tropical Cyclones. 



13 



On the first chart for October 30, fig. 5, a large oval area of low 

 pressure covers the Bay of Bengal; the probable position of the 

 vortex is marked by a small circle, but no reading can be given there 

 for want of observations. 



By next day, October 31, fig. 6, the centre has moved towards the 

 X.N.E., and the cyclone has increased enormously in depth. The 

 lowest reading for the day, about 20 miles west of the vortex, was 

 28'1 inch. As the next isobar is marked 29'6, the steepness of the 



Fig. 5. 



Tig. 6. 



