14 Hon. Ralph Abercromby. Relation between 



Fig. 7. 



Figs. 5 to 7 : Bengal Cyclones. 

 Tlie Backergunge Cyclone. 



central depression is of an amount unknown in higher latitudes. 

 The longer diameter of the cyclone lies about east and west, or 

 nearly at right angles to the path of the disturbance. The portion 

 of the general depression which lay near Ceylon on the previous 

 day has now developed into a well-defined secondary over that 

 island. This is very interesting, as we very often see precisely the 

 same thing in our own country, when a long oval depression gathers 

 itself up into two regular cyclones, or into a primary and secondary. 



By the third day, November 1, fig. 7, the cyclone is dying out 

 over the delta of the Ganges, and the longer diameter is now nearly 

 in a line with the direction of propagation. 



The velocity of translation appears to have increased irregularly, 

 but on the mean the rate was 9 miles an hour between the 30th and 

 31st, though during the last six hours the rate increased to 12 miles 

 an hour, and no less than 22 miles an hour between the 31st October 

 and 1st November. 



The ship " Tennyson " passed about 20 miles west of the vortex. 

 So early as the 28th the clouds had a bad appearance at daybreak. 

 On the 29th the weather looked very bad, with lightning and squalls, 

 while the barometer had begun to fall fast. During the 30th she 

 had rain with furious gusts, but no lightning. By 11 a.m. on the 31st 

 the wind went from N.E. to N.N.E., by noon to N., and by 1.30 p.m. — 

 just as the barometer reached the minimum of nearly 28*0 inches — to 

 N.N.W. with a perfect howl, but no rain fell from then to 6 p.m. No 



