reported in Vol. 5 - No. 2 of the Board's Bulletin. 

 Relationships useful in design for determining the 

 amplitude of the reflected wave for particular incident 

 waves and types of slopes of the intercepting structures 

 are evolved. 



II-A "Notice of Publication for New Method of Drawing Wave 

 Refraction Diagrams" 



The new method by R. S. Arthur, W. H. Munk and J. D. 

 Isaacs presented in an article published elsewhere is 

 described and a drawing of the protractor to be used with 

 the method is included. The new method is considered to 

 be simpler and quicker at no sacrifice in accuracy than 

 other methods in general use. 



"Progress Reports on Research Sponsored by the Beach Erosion 

 Board" 



Abstracts from progress reports on the several contracts 

 in force between the Beach Erosion Board and universities 

 or other institutions, and brief statements regarding the 

 status of research projects being prosecuted at the Board's 

 own laboratory are presented. 



"Beach Erosion Studies" 



Summaries of completed cooperative study reports on 

 Connecticut - Niantic Bay to Connecticut River and Racine 

 County, Wisconsin, and listing of those cooperative studies 

 still in progress are presented, 



"Beach Erosion Literature" 



Abstracts of four reports on research performed by the 

 University of California for the Office of Naval Research, 



ISSUE NO. 3 - 1 July 1953 



II-A "Calculation of Refraction Factor Along a Wave Ray" by Robert 

 S. Arthur, Scripps Institution of Oceanography 



Application of theory for calculating the refraction factor 

 along a single ray without drawing a second ray is dis- 

 cussed, and an example is worked out. The method is time 

 consiuning however, and is suggested for special rather than 

 general use. 



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