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"Human beings hardly ever learn from the experience of others. They learn; when they do, which isn't often, on their own, the hard way."
- Robert Heinlein
 |
| Columbiad | ||
| An enormous cannon, sufficient in size to send a projectile to the Moon. |
In Jules Verne's famous 1867 novel, From the Earth to the Moon Impey Barbicane, President of the Baltimore Gun Club, made this statement to the assembled members:
Well! starting from this principle, I ask myself whether,
supposing sufficient apparatus could be obtained constructed
upon the conditions of ascertained resistance, it might not be possible to project a shot up to the moon?
...I have looked at
the question in all its bearings, I have resolutely attacked it,
and by incontrovertible calculations I find that a projectile
endowed with an initial velocity of 12,000 yards per second, and
aimed at the moon, must necessarily reach it. I have the honor,
my brave colleagues, to propose a trial of this little experiment."
Verne goes into considerable detail regarding the Columbiad, the cannon that will generate enough force to put a projectile carrying men into orbit.
""You know," said he, "what progress artillery science has made
during the last few years, and what a degree of perfection
firearms of every kind have reached. Moreover, you are well
aware that, in general terms, the resisting power of cannon and
the expansive force of gunpowder are practically unlimited.
The first person to think of using a cannon to put a projectile in orbit was Isaac Newton. In his epochal work Principia Mathematica, he described a thought experiment:
Imagine a mountain so high that its peak is above the atmosphere of the earth. Imagine on top of that mountain a cannon, that fires horizontally. As more and more charge is used with each shot, the speed of the cannonball will be grater, and the projectile will impact the ground farther and farther from the mountain. Finally, at a certain speed, the cannonball will not hit the ground at all. It will fall toward the circular earth just as fast as the earth curves away from it. In the absence of drag from the atmosphere, it will continue forever in an orbit around the earth.
| During the eight months which were employed in the work of
excavation the preparatory works of the casting had been carried
on simultaneously with extreme rapidity. A stranger arriving at
Stones Hill would have been surprised at the spectacle offered
to his view.
At 600 yards from the well, and circularly arranged around it as
a central point, rose 1,200 reverberating ovens, each six feet
in diameter, and separated from each other by an interval of
three feet. The circumference occupied by these 1,200 ovens
presented a length of two miles. Being all constructed on the
same plan, each with its high quadrangular chimney, they
produced a most singular effect.
It will be remembered that on their third meeting the committee
had decided to use cast iron for the Columbiad, and in particular
the white description. This metal, in fact, is the most
tenacious, the most ductile, and the most malleable, and
consequently suitable for all moulding operations; and when
smelted with pit coal, is of superior quality for all
engineering works requiring great resisting power, such as
cannon, steam boilers, hydraulic presses, and the like.
Cast iron, however, if subjected to only one single fusion,
is rarely sufficiently homogeneous; and it requires a second
fusion completely to refine it by dispossessing it of its last
earthly deposits. So long before being forwarded to Tampa Town,
the iron ore, molten in the great furnaces of Coldspring, and
brought into contact with coal and silicium heated to a high
temperature, was carburized and transformed into cast iron.
After this first operation, the metal was sent on to Stones Hill.
They had, however, to deal with 136,000,000 pounds of iron, a
quantity far too costly to send by railway. The cost of
transport would have been double that of material. It appeared
preferable to freight vessels at New York, and to load them with
the iron in bars. This, however, required not less than sixty-
eight vessels of 1,000 tons, a veritable fleet, which, quitting
New York on the 3rd of May, on the 10th of the same month ascended
the Bay of Espiritu Santo, and discharged their cargoes, without
dues, in the port at Tampa Town. Thence the iron was transported
by rail to Stones Hill, and about the middle of January this
enormous mass of metal was delivered at its destination.
It will easily be understood that 1,200 furnaces were not too
many to melt simultaneously these 60,000 tons of iron. Each of
these furnaces contained nearly 140,000 pounds weight of metal.
They were all built after the model of those which served for
the casting of the Rodman gun; they were trapezoidal in shape,
with a high elliptical arch. These furnaces, constructed of
fireproof brick, were especially adapted for burning pit coal,
with a flat bottom upon which the iron bars were laid. This bottom,
inclined at an angle of 25 degrees, allowed the metal to flow into
the receiving troughs; and the 1,200 converging trenches carried
the molten metal down to the central well.
|
| Technovelgy from From the Earth to the Moon,
by Jules Verne. Published by Pierre-Jules Hetzel in 1867 Additional resources -
|
Verne had the right idea - it would take a substantial acceleration to free onself of Earth's gravitational pull. However, recent calculations have shown that, rather than achieving the 12,000 yards per second required (a correct calculation!), the Columbiad and it's charge of powder would only have accelerated the projectile to approximately 1,200 yards per second. This would send the projectile 12 miles into the air - before falling back to Earth.
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More Ideas
and Technology from From the Earth to the Moon
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Tech news articles related to From the Earth to the Moon
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Columbiad-related
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| Marslink Proposed By SpaceX |
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