rock size presented in an earlier Bulletin article 

 (Vol. 3 - No. 1 ) is discussed and certain modifi- 

 cations and generalizations are introduced bearing 

 on evaluation of the constant term as based on 12 

 years experience since the original formula was 

 introduced. 



II-E "Application of Asphalt in Hydraulic Engineering Works" 

 by J. H. Van der Burgt 



A translation of a Dutch paper describing use of asphalt 

 in hydraulic works in The Netherlands. General standards 

 and uses for asphalt are discussed and detailed descrip- 

 tion (with photographs) of actual coastal projects in 

 The Netherlands are presented. 



"Beach Erosion Studies" 



Listing of cooperative studies in progress. 



"Beach Erosion Literature" 



Abstracts of acquisitions to the Board's Library. 



ISSUE NO. 2 - April 1951 



I-A "Limiting Batter (Slope) Between the Breaking and Reflection 

 of Waves" by Ramon Iribarren Cavanilles and Castro Nogales y 

 Olano 



A formula previously presented by the authors, expressing 

 the limiting slope of a structure in terms of incident wave 

 characteristics where slopes flatter than the limiting 

 slope result in breaking waves and steeper slopes result 

 in reflected waves, is discussed and re-examined in light 

 of further experimental work by other investigators. The 

 limiting slope given by the formula is verified to be the 

 mean slope between that resulting in total breaking and 

 that resulting in total reflection. 



II-A "Wave Diffraction for Oblique Incidence" by Henri Lacombe 



Translation from the French language of an article appear- 

 ing in December 1950 Information Bulletin of the Comite 

 Central d'Oceanographie et d»Etude des Cotes. Theoretical 

 solution of this problem is discussed in relation to 

 simplified solution by others. 



59 



