His results are as follows:
Pounds.
At 5 feet................................ 231/2
" 10 " ................................ 75
" 20 " ................................ 177
" 30 " ................................ 274
" 40 " ................................ 369
Regarding the comparative effects of gunpowder and the high
explosives, I think Gen. Abbot's estimate of a varying value for
powder is more admissible than the fixed value assigned by Col.
Bucknill. Gunpowder gives a push and detonating compounds a shock; as
the quantities increase, the push reaches farther than the shock.
According to Gen. Abbot, 100 pounds of dynamite No. 1 will have a
destructive horizontal range of 16.3 feet, while the same amount of
gunpowder will only have a range of 3.3 feet. Five hundred pounds of
dynamite, however, will have a horizontal range of 35 feet, and 500
pounds of gunpowder will have 19.5 feet; the ratio has diminished from
five to two. Whether 6,500 pounds or 12,000 pounds per square inch is
necessary to crush the bottom of an armorclad will depend largely upon
how far apart the frames of the ship are spaced and what other bracing
is supplied, as well as many local circumstances.
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