- 5 - 



43 

 No introduction to the subject of bubble pulsations 



can be complete without mention of several early papers, theoret- 



5 

 ical ones by Lamb and by Kayleigh , and an experimental one by 



Ramsauer , which preceded the work of Butterworth and Willis 



presented elsewhere in this Volume. Rayleigh was (■inyipren with the 



collapse of cavitation bubbles, while Lamb and Ramsauer studied 



only the expanding phase of the motion, and make no mention of 



the phenomenon of successive pulsations* however, their work 



contains the essential ideas of the theory of Section 3 and has 



other interesting features as well. A brief account of Ramsauer' s 



work is given in Appendix S. 



h. Umb, Phil. Mag. 45,257(1923); Lord Rayleigh, Phil. Mag, 

 34,94 (1917). 



^C. Ramsauer, Ann. d. Physik 72,265 (1923). 



