Abstract
It is a well known fact that when a jet of air is flown into the mouth of an organ pipe, a tone of definite pitch is produced, causing standing oscillation of the air column in the pipe, and analogous phenomenon may be expected to happen in case of liquid. Thus, a current rushing past by a bay laterally may become a sourse of excitation of secondary undulations in it. The result of observations made by some Japanese investigators seems to justify the above view. In this paper, is proposed an explanation of this phenomenon.
