'"Water Tifaves Over A Sloping Bottom," E. Isaacson, Comiminications on 

 Pure and Applied Mathematics , March 1950. 



This paper presents a mathematical study of progressing 

 gravity waves traveling over a plane sloping bottom with 

 crests parallel to the bottom contour So The derivation handles 

 a wide range of bottom slopes. 



'•Production and Study of Ocean Waves in the Laboratory, F. J. Sines, 

 The Dock and Harbour Authority, Jan. 1950. 



The article gives a brief description of a new type wave 

 machine, constructed at the University of fJashington which pro- 

 duces waves that are of true form as they leave the source. By 

 setting the machine to conform with theoretical wave properties, 

 the height, length, and orbital particle movement are controlled. 

 The new wave machine duplicates these theoretical wave properties 

 with a flexible stainless-steel plate perpendicular to the 

 direction of travel. As particle rotation is introduced at the 

 source, the wave attains its true form as it leaves the machine, 



"An Electrical Method for Measuring Air Concentration in Flowing Air- 

 Water Mixtures, Owen P. Lanb and John M. Killen, March 1950, 



An electrical measurement of air concentration was chosen 

 after examining possible mechanical, chemical, and magnetic 

 methods. The method consists basically of a measurement of the 

 difference between the conductivity of a mixture of air and 

 water and conductivity of water alone. 



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