An apparatus for the production, stroboscopic observation, and measurement of ripples for surface-tension determinations is described. The principal features are the use of a mirror attached to a vibrating reed as the means of obtaining intermittent illumination and a valve oscillator for actuating the dipper. Frequencies are measured by causing the oscillator to light an Osglim lamp which illuminates a stroboscopic disc attached to a phonic motor running at a constant speed. The dynamic quality of the ripple method is discussed and it is shown that the local change of area of the surface due to the passage of ripples would be expected to be negligible. Measurements of the fall of surface tension of a slowly absorbed solution show that the method gives results similar to those obtained by a truly static method and it is concluded that the ripples have no retarding effect on the attainment of surface equilibrium.
No takes yet. Share an insight, caveat, or question.
R C Brown (1936) studied this question.
Synapse has enriched 3 closely related papers on similar clinical questions. Consider them for comparative context: