521 Calculation of Wave Resistance. 
When koh < 1, that is c? >gh, the equation (31) for « has a real root only 
for a more limited range of values of 0, the lower limit being 65 = cos y/(kgh) 
instead of zero. It is readily seen that the expression for R will be as in (38) 
with 6, as the lower limit of the integral. 
Summary. 
An examination is made of the transfer of energy in a free wave pattern, 
and expressions for wave resistance are deduced. These are applied to certain 
cases both for deep water and for water of finite depth, 
