have not been investigated by the author, and possibly they can 
be worked out in some future paper. The method has definite 
advantages over the method described above according to Tukey. 
A final method for the determination of [ay (pw ,0)1° depends 
upon the acceptance of the results of Chapter 9. The oceans act 
as a filter on the waves which propagate from the edges of the 
storms over them. Swell simultaneously recorded on a line of 
pressure wave recorders (on the California coast, for example) 
spaced several hundred miles apart can be analyzed by the equa- 
tions given in this section. The 96 band width and filter char- 
acteristics could be determined from the dimensions of the storm, 
and the power spectrum at the edge of the storm could be computed 
from the observed power spectra after the propagation of the waves 
over a long distance of decay. [a5 (m ,0)1° at the edge of many 
storms must also be determined by the methods described in previous 
paragraphs in order to verify the statement made in this paper 
that friction effects are negligible. If this statement is veri- 
fied, and many arguments have been given which make it appear to 
be true, the method described in this paragraph will then be a 
very important way to study the variation of [a5 (m ,0)1° with 
wind velocity and air mass properties. 
= s71One 
