The Damping of Pendulous Jets

Abstract

IN a previous letter to NATURE (April 11, 1925, p. 530) the behaviour of liquid jets from a moving source was discussed theoretically, and supporting experimental data were presented. Dr. Julius Hartmann reviewed the subject in the issue of NATURE of June 6, 1925, p. 872, and arrived at confirmatory conclusions, though adopting a different mode of attack and manner of statement. Both of these communications treated the particles constituting the jet as though in free flight. The possibility of their being subject to viscous constraints while in flight was alluded to in the former paper, but Dr. Hartmann detected no such damping effects under his conditions of observation. Lately, Mr. Walter Thompson and I have examined the damping effect, and as the conclusions admit of concise statement they are presented herewith.