HYDROGRAPHICAL NOTES. 
167 
I insert two examples of the Barpmeter during summer ; 
the first shews the state of the barometer during a SE. 
gale, and the next its state during the NE. and westerly 
winds. 
I. 
December 
1817. 
Time of 
day. 
Wind. 
Barom. 
Therm. 
State of the Weather dur- 
ing the SE. Wind. 
5 
8 p. M. 
SE. 
30,06 
64 
Strong breezes. 
8 A. M. 
SE. 
30,10 
67 
Strong gale. 
•1 
Noon. 
SE. 
30,13 
67 
Very strong gale. 
8 p. M. 
SE. SSE. 
30,13 
66 
Very strong gale. 
8 A. M. 
SE. 
30,14 
71 
Very heavy gale. 
:i 
Noon. 
SSE. var. 
30,12 
67 
Light airs, aiad fine. 
Noon. 
Do. do. 
29,90 
74 
Moderate and fine weather. 
11, 
December 
1817. 
Time 
of day. 
Barom. 
Thei-m. 
Wind. 
State of the Weather during 
Northerly & Westerly Winds. 
8 P.M. 
29,97 
694 
NNE. 
j Strong breezes, and squally, 
\ a little rain. 
"1 
13 
14 
8 A. M. 
Noon. 
8 p. M. 
Noon. 
Noon. 
29,95 
29,93 
29,93 
30,04 
30,01 
63 
€34 
644 
62 
62 
NNW. 
NNW. 
NW. 
WSW. 
SW. 
Moderate and cloudy, 
f Moderate and cloudy, with 
( much and heavy rain. 
Heavy rain. 
Moderate and fine weather. 
Light breezes, and fine. 
The range of the barometer during the winter months, 
viz. from the middle of April to the middle of September, 
is much greater than during summer. The greatest range 
I have observed being .85 parts of an inch, from S0.30 to 
to 29.45. This last is by far the greatest depression I have 
observed, and this but once. I had never before seen it 
lower than 29.65, and then it blew very hard from NW- 
It may be laid down as a general rule in this climate, that 
whenever the barometer falls as low as 29-70, during the 
winter months, it will blow hard from NW. or NE. ; when 
as low as 29.65, it will blow very hard; and when below 
