However, since the
data bearing on the effects of fouling and of protective
coatings on the effciency of ships during operration
are expressed in the terms of this theory and
were obtained by these techniques, it is necessary
to present an elementary account of these matters.
For a more complete treatment, standard works
such as those of Taylor (24), Davidson (7), Saunders
and Pitre (18, 20, 21) may be consulted.