form useful for most analog recorders, telemetry- 

 inputs, digitizing devices, etc. 



CONCLUSIONS 



The instrument described herein is capable of 

 directly measuring variations in sea water level 

 over a nominal band from 1 cps to 1 cycle per 

 day. Accuracy may be held to 0.2$ of the length 

 of the staff which can be readily manufactured 

 in lengths from 5 to 100 feet. These specifica- 

 tions apply only so long as the surface of the 

 staff is clean; _in situ testing is in progress 

 to determine degradation caused by marine 

 fouling. The system is readily portable and the 

 transducer is rugged enough to withstand rough 

 handling and adverse environmental conditions 

 common to oceanography. 



ACKNOWLEDGMENTS 



The authors wish to acknowledge the assistance 

 and suggestions rendered by J. I. McQuilken and 

 R. D. Gaul during development of this instrument 

 as well as the help of Mr. Gaul with preparation 

 of the manuscript. 



REFERENCES 



1. DeLEONIBUS, P. S. , Resistance wire wave staff, 

 p. VII-14 in Oceanographic Instrumentation , 

 2nd Edition, Special Publ. 41, U. S. Navy 

 Hydrographic Office, i960. 



2. FARMER, H. G. and D. D. KETCHUM, An instru- 

 mentation system for wave measurements, 

 recording and analysis, Proc ■ , 7th Conf . on 

 Coastal Eng. , 1, Chapt . 5, August i960. 



99 



