definite improvement over the ship-borne wave recorder in that it 

 should respond to much lower-period waves because of the smaller 

 size of the buoy compared with that of a ship. Although a certain 

 amount of error exists in the acceleration information received, and 

 the transmitter and tuner are not completely drift-free, the Hydro- 

 graphic Office has purchased several of the telemetering wave buoys 

 for obtaining wave records in the open sea. It is recommended that, 

 in addition to further accuracy tests, extensive tests be made to 

 determine the number of times the telemetering wave buoy can be 

 launched and recovered without breakdown. 



At the present time the submarine sonic scanner offers the best, 

 if not the only, opportunity to obtain accurate wave records in deep 

 water over the complete wind- wave spectrum of interest. 



3. Fixed wave gauges 



It is felt that the resistance wire wave staff overcomes the 

 accuracy problems inherent in the several step-resistance gauges 

 discussed in this Section and is simpler to construct than the elec- 

 tronic sea-wave recorder. Therefore, it is recommended that use 

 of this gauge be continued and that additional gauges be built for 

 installation at other locations. An improved method of analysis of the 

 wave data should be devised to facilitate the processing of the infor- 

 mation derived from these gauges. 



E. SELECTED REFERENCES 



The references listed alphabetically below also may be grouped 

 into various categories for convenience and ease in pursuing a particu- 

 lar subject as follows: (1) collected references, (2) bottom pressure 

 instruments, (3) floating wave gauges, (4) fixed wave gauges, and (5) 

 airborne wave measuring techniques. 



1. Collected references 



References VII-2, -4, -10, -11, -15, -22, -28, -33, and -36 on 

 various subjects are collected in Proceedin gs of the First Conference 

 on Coastal Eng ineerin g Instruments , Berkele y, California , October 31 - 

 November 2, 1955 , edited by R. L. Wiegel, and published in 1956 by the 

 Council on Wave Research, The Engineering Foundation. References 

 VII-21 and VII- 31 contain short discussions of various bottom and 



VII- 17 



