~ 
214 NOTES ON — RECENT BAROMETRIC DISTURBANCES. 
compass, but there was nothing else except the darkness remark- 
able. From this time (5 p.m.) the barometer was unsteady, bu 
not remarkably so until ‘20 p 
change is recorded—the barometer fell 0-115 in. in 6 minutes, 
and rose 0-075 in. in the followmg 5 minutes ; this fall is at the 
rate of 1:150 in. per hour, and the rise at the rate of 0-750 in. 
per hour. Again, there was a sudden change in the cote “s 
the wind from 8.8.E. to E.8.E., but nothing else to remark ; 
clouds being still very ake but apparently passing away. 
From 4 to 7:30 p.m. of the 21st November we have another 
remarkable curve during the passage of a heavy thunderstorm, 
Aa 
a 
48 
® 
gE 
a= 
® 
5 
8 
@ ct 
es 
S 
aS 
7 
@ 
passing rai rain-clonds are lighter than the surrounding 
then can we account for the increase of pressure Sleek is 80 
thunder-cloud 
mass, travelling by its own velocity (which is vail considerable) 
through the air; and, in so iin the air in front of it must get 
compres med sit gi ves way— the effect is too —— to be 
air. 
The next barometer curve which I have to bring under your 
notice is eiciaia a on veral respects the most remarkable I — 
ever seen. You have ide read in the daily papers accoun 
of a fearful storm in the Western Districts.on the 27 vg ‘November, 
1877. At t Grenfell the damage done to the house town 
but I will not detain you’ with se aaa of 
over C Cowra, but unfortunatel, y the ret is not given. We 
