ON THE HOURLY OBSERVATIONS OF THE THERMOMETER. 205 
mean annual daily curve have been calculated, on the supposition 
that they are semi-parabolas of the following dimensions : 
Morning branch A B. . <| 
Noon branch 
Afternoon branch DE | 
Night branch E A .. .. 
Ordinate BC = 192' = 3°*2 
Absciss. AC = 234' = 3°*9 
Ordinate B G = 288' = 4°*8 
Absciss. GD= 306' = 5°T 
Ordinate GE = 360' = 6° 
Absciss. GD = 306 = 5°T 
Ordinate E C = 600' = 10° 
Absciss. AC = 234' = 3°*9 
The results are given in the following Table, which contains 
the calculated and observed temperature for each hour, together 
with the differences. 
Table XVI.—Showing the mean annual Hourly Temperatures 
for 1833 and 1834 at Plymouth, as observed and calculated on 
the supposition that they may be represented by Parabolic 
Abscissae. 
Hours. 
Observed Temp. 
Calculted Temp. 
Differences. 
fH 
o 
G 
c3 
5 A. M. 
49 — m 
49- 
o-oo 
CP CP 
6 
49-51 
49-38 
+ 013 
a ^ 
7 
50-98 
50-52 
+ 0-46 
S-» 
o 
8 
52-52 
52-41 
+ 0-11 
s 
8 9 m 
52-90 = (a 
52-89 
0-00 
o 
9 
54-33 
54-36 
- 0 03 
c 
10 
55-76 
5603 
- 0-27 
11 
56 84 
57-12 
— 0-38 
C CP 
o 
12 P. M. 
57-67 
5778 
— 0-11 
o 
£ 
1 
58- = M 
58- 
o-oo 
o 
2 
5765 
57*85 
— 0-20 
C 
c3 
S-i • 
3 
57-04 
57-47 
— 0-43 
4 
56-12 
* 56-80 
- 0-68 
gQ 
<D 
5 
55-02 
55-85 
- 0-83 
6 
53-94 
54-64 
- 0-70 
<£h 
<1 
7 
52-90= ^ 
53-90 
0-00 
8 
52 05 
52-24 
— 0-19 
<5 
9 
51-44 
51-57 
- 013 
10 
50-85 
50-96 
— Oil 
r—^ 
o 
11 
50-34 
50-44 
— 0-10 
G 
a 
12 
50-11 
50 00 
+ Oil 
CP 
1 A. M. 
49-7^ 
49-64 
+ 008 
2 
49-39 
49-36 
-f 0 03 
• i—1 
3 
49-16 
49.16 
o-oo 
25 
4 
4903 
49-04 
- 0 01 
