Naval Photo Interpretation 
other hand, has more prominent side-streams, perhaps, 
than the four craft up to the right in the picture, but her 
central streams is of different volume and pattern. 
Thus, the picture in Fig. 4 presents not less than 
four different wake patterns, probably as a result of four 
different hull designs. 
Through series of experimental tests with vessels 
" jt has been 
of different types and classes as ''targets 
possible to state the usefulness of wave and wake patterns 
as decisive factors when analyzing verticals, even as re- 
gards relatively small scale ones. Low obliques may offer 
good possibilities as well (see Fig. 4). High obliques, on 
the other hand, are as a rule more or less unsuitable for 
the purpose. 
Therefore, a close study of wave and wake patterns 
of ships of current interest seems to be of special value 
to the important branch of naval photo interpretation, 
called identification.