POTENTIAL GRADIENT TABLES 473 
in a complete hour ; higher winds were always recorded 
in gusts. 
{b) Framheim. The highest recorded reading of the 
hand anemometer. 
{c) Cape Adare. The highest Beaufort number 
reduced to miles per hour. 
Potential Gradient 
The values are the mean of those obtained during 
fine weather reduced to volts per metre over a level 
surface. 
Cape Evans 
Wind, 
Barometer, Inches. 
Temperature, 
Miles per 
Hour. 
I9II. 
Mean. 
Max. 
Min. 
Mean. 
Max. 
Min. 
Mean 
Vel. 
Max. 
Vel. 
Feb. 
29-31 
29-74 
28-96 
i8-7 
33 
0 
23-6 
61 
March 
29-21 
29-51 
28-85 
7-2 
23 
- 7 
257 
57 
75 
April 
29-32 
29-80 
28-82 
— i-i 
13 
-18 
15-9 
55 
73 
May 
29-23 
29*84 
28-26 
-10-8 
14 
-29 
12-0 
54 
62 
June 
29-11 
29-82 
28-65 
-13-5 
17 
-37 
13-2 
56 
72 
29-08 
29-55 
28-52 
-21*1 
8 
-SO 
18-5 
66 
84 
Aug. 
29-19 
29*72 
28*64 
-20*8 
15 
-42 
167 
66 
78 
Sept. 
29-16 
29-85 
28*29 
-15-8 
II 
-37 
H-5 
57 
105 
Oct. 
28-82 
29-76 
28*20 
- 3*5 
8 
— 20 
17-9 
59 
91 
Nov. 
29-63 
30-15 
28*98 
+ 12*4 
26 
— 2 
i6-i 
43 
89 
Dec. 
29-75 
30*04 
29*08 
+ 22-0 
32 
+ 8 
147 
48 
107 
1912. 
Jan. 
29-43 
29-74 
29*05 
+ 21'4 
39 
+ 10 
10-9 
54 
98 
