Published online by Cambridge University Press: 28 July 2016
Turbulent motion in open air must be studied in a way differing from that followed in laboratory experiments. We cannot choose or arrange for the most suitable conditions; we have to make the best of what nature offers; it is nearly impossible to stain air masses sufficiently so that they show streamlines-we have to judge their possible form from complicated effects. The results arrived at will depend upon the means at one's disposal and the way pursued.
Note on page 365 * I must express my thanks to Prof. L. W. Pollak (Prag) for his advice and assistance; a great part of our material was worked out by trie Czech Statistical Institute.
†cf. Gerlands Beitrage zur Geophysik, 25, H 3/4 (1930).
Note on page 373 * Proc. Inst. Automobile Engineers, Vol. IX., p. 213, Fig. 23.