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140
THE SUBMARINE TORPEDO BOAT
secure the desired results. The solution obviously means
the doing away with the dual power system, and will
probably evolve into an all internal combustion engine or
steam engine plant. It may be confidently expected
that some such means for remedying the present short-
comings will be speedily put into general practice. With
the advent of such a system, surface speeds of twenty
knots and submerged speeds of sixteen to eighteen knots
would be feasible.
The objection has been raised by some that such a
system must leave a trail of bubbles behind it as does a
Photo-copyright, Underwood and Underwood
Wake of Torpedo Showing Trail of Air Bubbles
torpedo and that the position of the submarine would
therefore be disclosed to the battleship. This has not
been found to be the case however, and in fact with the
submarine running at a normal cruising depth no dis-
turbance of any great amount takes place upon the sur-
face. Granting for the moment that a submarine did
leave a wake like the torpedo, it is well known that the
trail of a torpedo may be followed from the bridge of a
battleship only for about 800 yards with any chop on at
all, and this is easy range for torpedo fire. It is also much
more difficult to detect this disturbance of the torpedo
when coming towards the ship from an unknown quarter.
Even though the submarine were discovered when at a