in Plate VI could just as easily have been carried out if the 
sin 2rt/T in equation (4.1) had been replaced by the cos 2rt/T. 
All that is needed is a few changes in sign in appropriate parts 
of the derivation. An arbitrary phase lag, 5, can be inserted 
into the sinusoidal term of equations (4.8), (4.9) and (4.10) 
and the equations will still be valid. 
Evaluation 
Now that the solutions have been obtained, some graphs and 
tables will be presented in order to show how the functions vary, 
why they vary the way they do, and what physically significant 
conclusions can be drawn from the data assembled. When the para- 
meters of the solution are varied, the behavior of the solution 
varies markedly. 
The behavior of the solution depends most strongly on the 
parameter, o , which, in equation (4.1) determines the rate at 
which the envelope of the sinusoidal term goes to zero. For 
large values of o the duration in time of the original disturb- 
ance is short. For small values of o0 the duration of the ori- 
ginal disturbance is long. 
Spectrum 
Thus o is an interesting parameter to trace through the re- 
maining equations. Consider, for example, the effect of o in 
equation (4.6) in which it determines the nature of the continuous 
spectrum. The amplitude of the continuous spectrum is given by 
e( 4) as shown in figure 1 where the minus sign is omitted by 
virtue of equation (3.9). 
The graph of the spectrum is a probability curve with a 
SAD 
