22 
MR. LEWIS F. RICHARDSON ON 
Table IV. — Observed Values of 
Entropy gradient 
vertically upwards. 
Surface. 
1 
Methods. 
Notes. 
1 
h 
cm. 
above 
surface. 
V x 
cm. 
sec. 
XX 
dynes per' 
square 
centi¬ 
metre. 
1919, Oct., 2 Id. 12h., 
Benson 
Obstructions up 
wind f radian 
Paraffin vapour. . . 
160 
250 
- | 
1919, Oct., 29d. 15h., 
Benson ; raining 
Obstructions up 
wind 0•045 
radian 
Smoke. 
190 
330 
Small ?. 
Moor, trees . . 
Burning rubbish . 
VII. 
900 
300 
- 
Small 1 . 
Fields, trees . . 
Factory chimney . 
VIII. 
3,000 
600 
— 
Negative 1 ... . 
Moor, low hills . 
Cloud. 
IX. 
150,000 
2,000 
1000 
200 
Small 1 . 
Wooded hills . . 
Large fire .... 
X. 
25,000 
37,000 
1600 
— 
Shell-puffs .... 
XI. 
300,000 
500 
— 
Positi ve 1 . 
Spurn head . . 
Dines anemometer 
XII. 
— 
1200 
-80 
Positive 1 ... . 
Open sea . 
Steamer’s smoke . . 
XIII. 
1,500 
— 
— 
Negative 1 . . . . 
Open sea . . . 
Steamer’s smoke . . 
J 
XIV. 
5,000 
200 
— 
1 
Open sea . . . 
Alto-stratus .... 
XV. 
500,000 
— . 
— 
Notes to Table of Eddy-Stresses and Diffusivities. 
I. 1917, June, 16d. 4h. 8m. L.A.T., hilltop near Ancemont, France. Standing hay composed of a 
species of Festuca (identified by my friend, Mr. Sam Pim). It grew fairly densely to 30 cm. from 
the ground and tall seed stems rose to 70 cm. 
II. 1917, July, 16d. 19|h. L.A.T., Maffrecourt, France. Green oats 70 cm. high. No trees near. 
About sunset. Overcast with stratus. Observers : David Long and L. F. Richardson. 
III. 1917, June, 29d. 19h. 30m. L.A.T., Yiel Dampierre, France. A field of corn 60 cm. high. 
Clouds (stratus) motionless. Observers : F. H. Weatherall, G. Hutchinson, L.F.R. 
