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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were made ofeither brass or copper, and in all cases were cleaned with H CI be-fore being placed in the water. It was found necessary to submergethe reflecting surfaces so that a thin film of water would cover themso that the incident ripple waves would not pass over but would bereflected. Otherwise, the water could raise along the edge of thereflecting surface and oroduce distortion of both the ripples ar.d thetransmitted light. Photograph No. 17 shows the reflected wave pattern from a straighedge made of a uniform brass bar whose end dimensions were I cm. x1/2 cm. The largest stop (No. 3) on the camera was used, and an ex-posure of 4 seconds was made. The Llovdes bands of interference arealso clearly shown extending off at equal angles from the straighted^e. Photograph No. 9Photograph No. 9 illustratescorrugated surface as is 3hown insisbs of a half circle cut from a Photograph No. ^the result of reflection from athe diagram below, Pig. VI, and con-brass cylinder which was 12 cm. in
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Pig. 6 diameter. The notches were carefully machined along the inner sur-face and were 3 mm. wide and 3 mm. deep. The generating tube wasplaced at S and in order to secure a reflected wave pattern of suf-ficient amplitude it was necessary to increase the air pressure 30much that the center of the pattern became distorted, however, thecomplicated interference effects are clearly seen near the edge ofthe reflecting surface in the picture. Stop No. 16 was used with anexposure of 10 minutes,whereas, the length of the ripple -waves in thiscase was slightly greater than the width of each corrugation. Byvarying the length of the waves many different and interesting pat-terns were formed, which could be studied at will. Thes^ are inter-esting because thus far they have proven too complicated for mathe-matical treatment. Thi3 method of investigation was extended to circular, ellipticaand parabolical surfaces. These were made of narrow copper sheets,and submerged in the water so that reflected

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