Volume 5, No. 2 (Continued ) 



Comparison of Observed Wave Direction with a Refraction Diagram 



During a period of exceptionally clear visibility, observations 

 of offshore wave direction at Mission Bay, California, were made with 

 a transit sighting bar (described in Volume 4, No. 2) and compared 

 with directions obtained from wave refraction analysis. On the whole, 

 agreement is good. Written by Donald R. Forrest. 



Volume 5, No. 3 - July 1951 



Bypassing Littoral Drift at a Harbour Entrance 



Translation by Wm. H. Vesper of a Spanish pamphlet entitled 

 "Draja Fija" (Fixed Dredge) published by "Junta Directive de Puertos 

 Libres I^exicanos" in 1950. The shoaling problem in the Free Port of 

 Salina Cruz, Mexico, is described, and a stationary dredging plant 

 nearing completion for bypassing the littoral drift is described in 

 detail with photographs. 



Calculation of Diffracted Wave Height Behind a Semi-i nf inite Jetty 



Curves giving diffracted wave height for incident waves normal, 

 45 degrees, and 135 degrees to a breakwater, are shown, using re- 

 sults derived by the method developed by Putnam and Arthur, and are 

 compared with results of laboratory experiments. Written by 

 C. Carry and E. Chapus, La Houille Blanche, January-February 1951. 



Volume 5, No. 4 - October 1951 



A Method for Drawing Orthogonals Seaward from Shore 



Detailed description of the method is presented, including 

 drawings of protractors to be used in applying the method. A com- 

 parison is shown between the orthogonal drawn from shore out with 

 that drawn from deep water into shore. Written by Thorndike 

 Savi I le, Jr. 



Volume 6, No. I - January 1952 



Summary Report on Studies of Sand Transportation by Wave Action 



This report is a summary of investigations conducted by the 

 Department of Engineering, University of California, under contract 

 to the Beach Erosion Board. The studies summarized are grouped under 

 general headings of Model Studies, Field Studies, and Wave Recorders 

 and Wave Data. 



54 



