fefore finishing it is my unavoidable duty to state that, when some- 

 time ago I expressed to my distinguished Professor Don Eduardo de 

 Castro, the ideas upon which I expected to found the new formula for 

 ■tiie calculation of dikes of rock-fill he encouraged me sincerely and 

 enthusiastically to put them into form, so that he is materially in- 

 volved in the completion of the present study. 



ANNOUNCMENT OF PUBLICATION 



Ihe feach Erosion Board annbunces the publication 

 of its Technical Memorandum No, 6 "An Ocean Wave Meas- 

 uring Instrument." Copies are being mailed to those 

 individuals and institutions on the mailing list for 

 technical publications . 



The gage described is believed to produce a direct 

 accurate record of the fluctuations of the sea surface 

 at the gage site. Kie instrument is not suitable for 

 use in locations where a suitable supporting structure 

 is not available. 



A limited number of copies are available for dis- 

 tribution upon request to the President, Beach Erosion 

 Board, Corps of Engineers, 5201 Little Falls Road, N.W. j 

 Washington 16, D. C. 



1^ 



