II-D "Comparison of Leadline and Echo Sounding Results Using 

 Amphibious Trucks" 



A series of underwater bottom profiles were obtained 

 by the Board's Field Research Group utilizing both 

 methods, and compared. The echo sounder method was 

 concluded to be far superior to leadline in that it 

 is more accurate, gives more detail, and is consider- 

 ably faster. 



I-F "A Study of Comparative Action of Waves on Model Beaches 

 of Different Scales" 



Laboratory tank tests to define with some exactness 

 the conditions under which a model involving wave 

 action on a moving sand beach can be expected to 

 accurately reproduce the action of the prototype and 

 how to correct the results if faithful reproduction 

 is not obtainable, are described. Some preliminary 

 results are presented. 



II-F "The Importance of Shore Protection Studies" by Dr. Martin 

 A. Mason 



The first of a series of four articles delivered as 

 lectures in the Advanced Course of the Engineer School 

 at Fort Belvoir, Va. 



"Beach Erosion Studies" 



Listing of cooperative studies completed since last issue 

 of the Bulletin and those still in progress. 



"Procedure for Initiating Cooperative Beach Erosion Studies" 



Information presented to assist local agencies in apply- 

 ing for cooperative studies. 



"Beach Erosion Literature" 



Abstract of acquisitions to the Board's Library. 

 ISSUE NO. 3 - 1 October 1947 

 II-F "Radio Equipment for Field Research Party" 



Description of equipment and operating experience, 



47 



