File:A study of the propagation, refraction, reflection, interference and diffraction of ripple waves (1914) (14596074950).jpg

Identifier: studyofpropagati00shew (find matches)
Title: A study of the propagation, refraction, reflection, interference and diffraction of ripple waves
Year: 1914 (1910s)
Authors: Shewhart, Walter Andrew
Subjects: Waves Hydrodynamics Theses
Publisher:
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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the surface of the water near the generating tube, the ripple patterncould be made to show the refractive influence of the second liquid.The drop itself would gradually move over the surface of the water sothat no photograph could be obtained by a time exposure. It couldalso be shown that ripples in very shallow water () mm. or less) 2 Rayleigh, Theory of Sound, Vol. II, pages 89-90. 26 travel slower than tnose In deeper water. This was done by • 1 LngB piece of olate glass in the bottom of the tank so that the waveswould travel through the very thin layer of liquid above the sub-merged surface. Interference: Photographs Nos. JO and Jl show the interferencepattern set up by a two point source. To secure these pictures twogenerating tubes were used instead of one. These were soldered tothe same cap and then fastened over the head of the adjustable tube,as shown in Fig. IV. The current, of air thus divided and a doubleset of isoperiodic air puffs, having the same phase, were obtained.
Text Appearing After Image:
Photograph No. 10 Photograph No. J.J Perpendicular to the line joining the two point sources in No. 1<a light line is visible. On either side of this is a system of con-focal hyperbolas having the two sources as their foci. These lines 84 mark the region of least disturbance being fohe locus of points wherea cre3t from one source coincides with a trough from the other sourcePhotograph No. U shews the results of spreading the generating tubesfurther apart. Between the two centers cf the system appear a systemof ellipses. The system of hyperbolas in this case were produced out-side of the region between the two sources but were too indistinct toshow in the picture. By changing the wave length, a resulting shiftin the interference bands could he observed. Diffraction: According to Huyghens principle a plane wavefront incident upon an opening that is narrow as compared to thelength cf the wave gives rise to a circular wave front on the oppo-site side which appears to diverge from the o

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