rection to a greater height, it is only possible to conclude that the agreement 

 is satisfactory within the range of possible variation of wind speed and true 

 spectral values, and that there is certainly no justification for changing the 

 constant in the Neumann spectrum. 



Added notes on the results of Farmer 



Farmer [1956] has made further measurements of wave slopes on the 

 windward side of Bermuda. He therefore had an unlimited fetch of open 

 water over which the sea was generated in contrast to the results of Cox 

 and Munk [1954] in which some islands may have interfered with the fetch 

 as pointed out by Darby shire [1956]. 



Farmer [1956] found essentially the same total slope variance as 

 Cox and Munk [1954]. The ratios of upwind downwind to total slope variance 

 found by Farmer were 0.57, 0.60, and 0.77, and these compare quite 

 favorably to the theoretical value of 0.625 given by equation (11.49). 



References to Parts 10 and 11 



Barber, N. F. , [1954]: Finding the direction of travel of sea waves. Nature , 

 V. 174, p. 1048. 



Cartwright, D. E. , [1956]: On determining the directions of waves from a 

 ship at sea. Proc. Royal Soc. , A, 234, 382-387. 



Cox, C. , and W. H. Munk [1954]: Statistics of the sea surface derived from 

 sun glitter. Jour, of Marine Research, 13(2), pp. 198-227. 



Darbyshire, J., [1955]: An investigation of storm waves in the North At- 

 lantic Ocean. Proc. Royal Soc. , A, v. 230, pp. 560-569. 



Darbyshire, J., [1956]: An investigation into the generation of waves 



when the fetch of the wind is less than 100 miles, Q. J. R. M. S. , v. 

 82, Oct. 1956, pp. 461-468. 



250 



