Six hundred pounds ground gun-cotton mines require 180 feet spacing.
Six hundred pounds ground blasting gelatine mines require 230 feet
spacing.
Of torpedoes, other than those described, we have several modern
varieties; submarine projectiles, submarine rockets, automobile and
controllable locomotive torpedoes. The first two varieties, though
feasible, are not developed and have not yet advanced beyond the
experimental stage. Of the automobile, we have the Whitehead,
Swartzkopf and Howell. The first two are propelled by means of
compressed air and an engine; the last by the stored-up energy of a
heavy fly-wheel. Generally speaking, they are cigar-shaped crafts,
from 10 to 18 feet long and 15 to 17 inches in diameter, capable of
carrying from 75 to 250 pounds of explosive at a rate of 25 to 30
knots for 400 yards, at any depth at which they may be set. Of the
controllable locomotive torpedoes, the three representative types are
the Patrick, Sims and Brennan. They are in general terms cigar boats,
about 40 feet long and 2 feet in diameter, carrying charges of 400
pounds of explosive. The Patrick and Sims are maintained at a constant
depth under water by means of a float.
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