31 



4. The magnitude of the difference in value of the wave character- 

 istics, other than mass transport, defined by the rotational or irrota- 

 tional theories is smaller than the experimental error associated with 

 the tests described herein. 



5. Certain experience in wave experimentation has been gained by 

 this essentially exploratory study which leads to the following general 

 statements. 



a. Prior to further experimentation for the purpose of verifying 

 wave theory, studies should be made of the generation of irrotational 

 waves by mechanical means, and of the necessary length of wave 

 travel after generation required for the wave to achieve a stable, or 

 permanent, form. 



h. The techniques of wave measurement in the laboratory should 

 be improved, a maximum error in experimentation of 0,25 percent 

 being desirable when comparisons similar to those of this study are 

 to be made. 



c. Provision should be made in future experiments to determine 

 directly the existence or non-existence of rotation in the wave motion 

 by study of the particle motion. 



