I 
C 283. ] 
Meteorological Obfervations at Caen in Normandy. 
Inches 
^765 
Mean height of 
Barometer 
Inches 
Mean height of 
Barometer. 
29,650 
January 
29>S50 
January 1768 
29,505 
February 
2Q 965 
February 
29,495 
March 
29,705 
March 
29,975 
April 
29 795 
April 
29,900 
May . 
29,760 
May 
30,000 
June 
29,835 
June 
29,990 
j >^ly 
29,845 
July 
2^5 60 ~i“ 
Auguft 
30>oi5 
Auguft 
29,645 
September 
29,740 
September 
N ovemLer 
29,410, 
November 
29,730 
December 
29,770. 
December 
29^655 
mean of thefe means 
29,828-j- 
mean of thefe means 
3°>375 
January 1766 
2,9,825 
January 1769 
30 065 
February 
29,725 
h ebruary 
March 
29>835 
March 
29,875 
April 
29,605 
April 
29,885 
July 
29 9 rS 
May 
30,065 
Auguft 
29,920 
June 
29,990 
September 
29,600 
July 
29^555 
Odiober 
29,8 1 0 
/Auguft 
29,992 — 
mean of thefe means 
29>7^5 
29,98 
September 
October 
29>575 
January 1767 
30,035- 
29,590 
November 
December 
29,665 
February 
29,860 
May 
29,805 
nacan of thefe means 
29,770 
June 
— ... 
29,825 
July 
Mean height 
In the years 
29,890 
September 
29,920 
Odtober 
29,665 
29,790 
November 
29,922 
j 766 
29 8j5 
December 
29,790 
1767 
29,790 
mean of thefe means 
29,828 + 
29,805 
1 768 
1769 
I 
! 29,802 
1 
mean of thefe means 
Remarks 
Thefe obfervations were made 
at noon, in a South- Weft room, 
with a barometer, whofe tube is 
about tV of an inch diameter j in 
which the motion of the quick- 
filver, in fqualls and gufts of wind, 
is extremely perceptible ; yet, for 
further fatisfadfion, I ordered an- 
other to be made in London, with 
the greateft care, by Heath and 
Wing,, with, a nonius giving the 
Tw part of an inch. I placed, this 
barometer by the other, in July 
1769; and having compared them 
every day for a year, I find that the 
ancient one marks -f|-o of an 
inch more than the other; there- 
fore, if from the mean height as 
above — 29,802 
be deduced' — 0,050 
the true mean height is 29,752 
The greateft height obferved, 
at noon, was, J'an.aq, 1766,. 30,72-- 
The leaft, Dec. 23, 1769, at 
8 h. P. M. 
Limits of the motion of 
quick filvtr 2,03 
Yol, LXl 
O o 2 
Hencft- 
