Damping of Gravity Waves by Surface Films 



CONCLUSIONS 



We conclude that, in the absence of very special precautions, surface con- 

 tamination may contribute significantly to the damping of surface waves. The 

 preceding analysis provides a rational estimate of the corresponding logarithmic 

 decrement provided that the required parameters, especially the surface com- 

 pressional modulus, are known. Further observations, including controlled ex- 

 periments guided by the theoretical predictions, are necessary before we can 

 say whether a reliable understanding and ability to predict have been achieved. 



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583 



