56 
JOHN H. EHLERS 
Table VI 
February 12, 1914 
Clear. Moderate breeze. Relative humidity 86.5% 
I 
2 
3 
4 
5 
6 
7 
8 
9 
Aver. 
Wind 
Time of 
No. of 
Bridge 
("alculated 
Shade 
Black Bulb 
Difference 
Actual 
Velocity 
Reading 
DiS'' 
Temp. 
in Vacuum 
Miles 
vation 
vations 
in Cm. 
5 and 6 
Temp. 
perHr. 
* 9-55 
I 
40.6 
5.12° 
— 19.0° 
12.8° 
31.8° 
-13-88° 
1.2 
10.20 
I 
30.0 
3.78 
-18. 1 
12.8 
30-9 
-14.32 
1.2 
10.48 
4 
27.8 
349 
-17.2 
I6.I 
33-3 
-13-71 
2.4 
10.58 
5 
34-2 
4-30 
-17.0 
20.0 
37.0 
— 12.70 
1.2 
11.05 
6 
41.4 
5-19 
— 16.0 
22.2 
38.2 
-10.81 
1.2 
11.46 
4 
30.0 
3.76 
— 16.0 
20.0 
36.0 
— 12.24 
2.4 
12.26 
6 
31-8 
3.98 
-15.8 
20.6 
364 
-11.82 
1.8 
12.36 
7 
37.0 
4.64 
-16.2 
21.2 
37-3 
-11.56 
1.8 
1.38 
4 
20.3 
2.54 
-15-5 
13-9 
29.4 
— 12.96 
1.8 
1 147 
4 
30.7 
3.84 
-15.0 
12.8 
27.8 
— II. 16 
1.8 
! 1.56 
8 
19.3 
2.41 
-15.2 
II.7 
26.9 
-12.79 
1.8 
1.36 
4 
154 
1-93 
-15.0 
5-6 
20.6 
-13.07 
1.2 
2.50 
2 
10.5 
1.31 
-15.2 
3-3 
18.5 
-13.89 
1.8 
2.543 
I 
6.5 
.81 
-15.2 
3-3 
18.5 
-14-39 
1.8 
Average 
3.56° 
-16.25 
31. 1 
-12.68 
1.7 
constant, is followed by a decrease in the differential temperature 
between leaf and air needs, of course, no proof. Nevertheless the 
tables given are of interest since they show the actual temperatures 
of the leaf under the conditions existing. Results are given in Tables 
VII, VIII and IX where the column headings are the same for all 
tables. 
Table VII 
January 16, 1914 
Hazy. Light breeze. Relative humidity 93% 
I 
3 
4 
5 
6 
7 
8 
9 
Aver. 
Wind 
Time of 
No. of 
Bridge 
Calculated 
Shade 
Black Bulb 
Difference 
Actual 
Velocity 
Obser- 
Obser- 
Reading 
Temp. 
Temp. 
in Vacuum 
Columns 
Leaf 
Miles 
vation 
in Cm. 
Diff. 
5 and 6 
Temp. 
per Hour 
II. 10 
5 
21.3 
2.54° 
5-0° 
25.6° 
20.6° 
7-54° 
11.40 
6 
15-9 
1.90 
5-2 
25.6 
20.4 
7.10 
11.58 
2 
15-9 
1.90 
5-5 
25.6 
20.1 
7.40 
12.30 
5 
18.2 
2.17 
5-7 
25-6 
19.9 
7-87 
12.40 
6 
20.4 
2.42 
5-8 
27.0 
21.2 
8.22 
12.50 
7 
26.8 
3.18 
6.0 
27.8 
21.8 
9.18 
0 
1. 10 
3 
18.9 
2.25 
6.5 
27-5 
21.0 
8.75 
i 1.23 
7 
18.2 
2.17 
5-3 
26.7 
21.4 
7-47 
f 1-35^ 
6 
8.2 
.97 
5.2 
26.1 
20.9 
6.17 
Average 
2.17 
5-58 
20.8 
7-74 
3 Leaf in shadow; not included in the averages. ^ Leaf in shadow. 
