Major Noble, R.A., gives

_________________

1.6 / w v²

P = /\ / ----------------

\/ [pi] g d 11334.4

[TEX: P = \sqrt[1.6]{\frac{w \ v^2}{\pi \ g \ d \ 11334.4}}]

Scientific American Supplement, No. 803, May 23, 1891 · 第 24 / 48 题