[ 203 ] 



XXII. 



ON THE STRUCTURE OF WATER-JETS, AND THE EFFECT 

 OF SOUND THEREON. 



BY PHILIP E. BELAS, Science Scholar, Department of Agriculture 

 and Technical Instruction for Ireland, Royal College of Science, 

 Dublin. 



[COMMUNICATED BY PKOFESSOR W. F. BARRETT, F.R.S.] 



(Plates XIX.-XXII.) 



[Eead, March 15 ; Eeceived for Publication, March 18 ; Published, May 12, 1904.] 



The circumstances under which the disintegration of a liquid jet 

 takes place have attracted the attention of many philosophers. 



Early in the last century Savart, in a series of classical re- 

 searches, investigated the subject ; and, following him, Plateau, 

 Magnus, Lord Bayleigh, and others have, in their turn, discovered 

 and explained many beautiful and complicated phenomena. 



During the course of my work, as a third-year student of 

 physics, I had occasion to repeat some of these experiments ; and I 

 here propose to give a brief account of them, together with some 

 additional observations of my own, the whole illustrated, as far as 

 possible, by means of instantaneous photographs. 



The observations were made, and the photographs taken, in the 

 Physical Laboratory of the Royal College of Science, by kind 

 permission of Professor W. F. Barrett, f.r.s., to whom I take 

 this opportunity of expressing my thanks for the suggestions 

 and facilities he afforded me in the work. 



If we observe a jet of water flowing from a narrow orifice, we 

 see that it may be divided into two parts — (1) a clear and unbroken 

 column ; (2) a turbid portion. The latter owes its troubled 

 appearance to its being in reality a rapid succession of drops, 

 which move too rapidly for the eye to distinguish them so long 

 as they are viewed by continuous light. 



