154 PROCEEDINGS COTTESWOLD CLUB 1905 
If we now consider the features of a depression or 
cyclonic area, we find (for details see plan) a large oblong 
area of low pressure, perhaps 1000 miles across its longer 
Cyclone Prognosues 
Dirly Sky 
Dense 
Cumulo Str¢g 
a 
ES 
= 
) 
=e 
Windy Cirrus 
Blue 
diameter, of which the main distinctive characteristics are : 
A circulation of winds over the whole area against the 
hands of a watch, inclined inwards towards the centre and 
upwards (hence the low barometric readings); warm, 
muggy and dirty weather in front; cool, dry and bright in 
the rear, there being an area of rain near the centre sur- 
rounded by a ring of cloud, both of which extend further 
to the front than to the rear of the centre. The cyclone 
is, also, divided into two well-defined halves by the line of 
“the trough,” and the front may be further divided into the 
right or S.E., and left or N.E. fronts, which are separated 
by the line representing the path of the cyclone, which is 
almost invariably from W. or S.W. to E. or N.E. 
An Anti-cyclone is an area of high pressure surrounded 
by nearly circular isobars. These are always a consider- 
able distance apart, and spread over a large area. The 
