1/ϵ2π
of its amplitude at the surface. (See Lamb’s “Hydrodynamics,” p. 189.)
[4] This can easily be shown to an audience by projecting the apparatus on a screen by the aid of an optical lantern.
[5] See “The Splash of a Drop,” by Professor A. M. Worthington, F.R.S., Romance of Science Series, published by the Society for Promoting Christian Knowledge.
[6] See Osborne Reynolds, Nature, vol. 16, 1877, p. 343, a paper read before the British Association at Plymouth; see also Appendix, Note A.
[7] A very interesting article on “Kumatology, or the Science of Waves,” appeared in a number of Pearson’s Magazine for July, 1901. In this article, by Mr. Marcus Tindal, many interesting facts about, and pictures of, sea waves are given.
[8] Lord Kelvin (see lecture on “Ship Waves,” Popular Lectures, vol. iii. p. 468) says the wave-length must be at least fifty times the depth of the canal.
[9] See article “Tides,” by G. H. Darwin, “Encyclopædia Britannica,” 9th edit., vol. 23, p. 353.
[10] The progress of the Severn “bore” has been photographed and reproduced by a kinematograph by Dr. Vaughan Cornish. For a series of papers bearing on this sort of wave, by Lord Kelvin, see the Philosophical Magazine for 1886 and 1887.
[11] See Lord Kelvin, “Hydrokinetic Solutions and Observations,” Philosophical Magazine, November, 1871.