FORWORD 



This Technical Note is concerned with the extraction of energy 

 from ocean waves by vertical columns which have a cross section of 

 crescent shape (which have been termed hydrodynamic forms in this 

 report). It consists of two parts: Part I in which is reported 

 the results of a hydraulic scale model test and Part II in which 

 the practicability of using such columns for partial station 

 keeping of large floating ocean platforms is investigated. 



