The tattoo of the Marine Band of the Royal Netherlands Navy, the cocktail 
party given by VADM. A. H. J. van der Schatte Olivier, Flag Officer Material, 
Royal Netherlands Navy and the dinner speech by VADM. L. Brouwer, Chief of 
Naval Staff, Royal Netherlands Navy were Dutch contributions which added to the 
success of the social part of the meeting. 
I should also like to express our gratitude towards the Board of Directors and 
the Staff of the Netherlands Ship Model Basin for their active help in organizing 
this Symposium in such a short time. 
Finally I would like to add my personal thanks to those of the Board of 
Directors of the NSMB to the Office of Naval Research for the confidence put 
in our organization and the help and close cooperation we enjoyed during the prep- 
aration of the Symposium. 
Wageningen, May 1962 
Prof. Dr. Ir. W.P.A. van Lammeren 
Director NSMB 
