20 
MR. LEWIS F. RICHARDSON ON 
Table IV.—Observed Values of 
The co-ordinate axes are taken to point: Ox horizontally with the mean wind at 
quantities are in C.G.S. units. Tractions are reckoned positive, so that xh and yh 
1 
Entropy gradient 
vertically upwards. 
Surface. 
Methods. 
Notes. 
1 
h 
cm. 
above 
surface. 
v x 
cm. 
sec. ‘ 
XX 
dynes per 
square 
centi¬ 
metre. 
Positive sunrise . 
Tall grass . 
Smoking wick . 
I. 
30 
170 
300,000 
10 
60 
200 
— 
! Small 1. 
Oat field . 
NH 4 C1 puffs. . . . 
NH 4 CI puffs.... 
Dandelion down . . 
II. 
40 
100 
50 
20 
40 
— 
Small 1 . 
Corn field . . . 
Smoke puffs .... 
III. 
120 
100 
- o-i 
Small 1 . 
Moor .... 
Smoking wick . . 
IV. 
165 
100 
— 
1 
Moor, trees . 
Thistle down . . . 
Y. 
200 
145 
- 2-4 
± 0-5 
Positive 1 ... . 
Flat field . 
Paraffin vapour. 
f VI. 
Figs. 1 
and 2 
| 190 
/ 170 
\ 140 
1919, Mar. 4 
Between England and the Isle of 
Wight. 
r 
Sea. 
Steamer’s smoke . 
4,000 
1001 
1919, Apr. 7, 
18h. 
Sea. 
Steamer’s smoke . 
10,000 
200 1 
1919, July 4, 
llh. over¬ 
cast 
Sea. 
Steamer’s smoke . 
2,000 
130 
— 
1919, July 5, 
12 h. 
Sea. 
Steamer’s smoke . . 
1,400 
140 
— 
Ditcham . . 
Capt. Cave’s balloon . 
p. 16 
100,000 
1270 
Flat fields . 
Phosphorus pentoxide 
r vi.- 
iFig. 3 
| 340 
120 
— 
