elements ara independent of each others position when recordingo 

 Figure 2-B is an example of a calibration showing this effect. The 

 full explanation of the phenomena discussed requires a knowledge of 

 the theory of interionic attraction, the disassociation theory of 

 solutions, and the tank effect on the interionic force fields. It is 

 plainly seen that the change of the electrolytic properties of the 

 water during an experiment or even from day to day would give undesir- 

 able results. 



Conclusion 



The above method of measuring wave heights at simultaneous positions 

 will give accurate measurements of wave height, wave length, wave 

 velocity, wave period, and in special cases, wave profile s. The ex- 

 pected error can be less than 5 per cent if the proper type of elements 

 and magnitude of power supplies are used when recording. This, of 

 course, requires a beforehand knowledge of the maximum wave height to 

 be expected so that the range of calibration necessary can be made. 

 Calibrations should be made before and after each experiment or at 

 least twice a day if elements are used continuously. 



Acknowl ed gmen ts 



The author wishes to take this opportunity to thank Dr. H„ A. 

 Einstein for his helpful advice and Professor J= Yf. Johnson for his 

 suggestions and cooperation. The confirmation of the information 

 assembled and helpful reference suggested by Mr. F. F. Davis was 

 deeply appreciated. Since this report is an extension of previous 

 work, the author feels that Mr. R. L. Wiegel was instrumental in lay- 

 ing the ground work. 



Bibliography 



DA VIES, Cecil Wo - The Conductivity of Solutions, J, Wiley & 

 Sons, New ^ork, 1930, 



WIEGEL, R. Lo - Measurement of Surface Waves by Electrodes, 

 Report No. HE-116-269, University of California Wave 

 Project, Department of Engineering, September 30, 194-7, 

 unpublished o 



WIEGEL, Ro Lo - Some Studies of Surface Waves in Shoaling 



Water, M.So Thesis in Engineering, University of Calif- 

 ornia, Berkeley, 194-9" 



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