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104
THE SUBMARINE TORPEDO BOAT
this depth is it hardly possible that a wider margin of safety
would afford any better chance.
It has been found by experiment and by testing to des-
truction full sized sections of a submarine that the resist-
Photo-copyright, International Film Service
Type of submarine gun housed in superstructure
ance of the frame to withstand collapse varies directly
as the section modulus of the frame and inversely as the
diameter of the boat, the frame being considered as bear-
ing all of the load unassisted by the extra thickness of
the shell plating. From the foregoing experiments the
following formula has been deduced:
PX diameter of the boat in feet