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Authors: Jules Verne
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so as to descend, that which was in the
outer balloon would go first; and, were it completely
emptied, the smaller one would still remain intact. The
outer envelope might then be cast off as a useless encumbrance;
and the second balloon, left free to itself, would not offer
the same hold to the currents of air as a half-inflated one
must needs present.
Moreover, in case of an accident happening to the outside
balloon, such as getting torn, for instance, the other
would remain intact.
The balloons were made of a strong but light Lyons silk,
coated with gutta percha. This gummy, resinous substance
is absolutely water-proof, and also resists acids and gas
perfectly. The silk was doubled, at the upper extremity of
the oval, where most of the strain would come.
Such an envelope as this could retain the inflating
fluid for any length of time. It weighed half a pound per
nine square feet. Hence the surface of the outside balloon
being about eleven thousand six hundred square feet, its
envelope weighed six hundred and fifty pounds. The envelope
of the second or inner balloon, having nine thousand two
hundred square feet of surface, weighed only about five
hundred and ten pounds, or say eleven hundred and sixty
pounds for both.
The network that supported the car was made of very
strong hempen cord, and the two valves were the object
of the most minute and careful attention, as the rudder of
a ship would be.
The car, which was of a circular form and fifteen feet
in diameter, was made of wicker-work, strengthened with
a slight covering of iron, and protected below by a system
of elastic springs, to deaden the shock of collision. Its
weight, along with that of the network, did not exceed
two hundred and fifty pounds.
In addition to the above, the doctor caused to be constructed
two sheet-iron chests two lines in thickness. These were
connected by means of pipes furnished with stopcocks. He
joined to these a spiral, two inches in diameter, which
terminated in two branch pieces of unequal length, the
longer of which, however, was twenty-five feet in height
and the shorter only fifteen feet.
These sheet-iron chests were embedded in the car in
such a way as to take up the least possible amount of
space. The spiral, which was not to be adjusted until
some future moment, was packed up, separately, along
with a very strong Buntzen electric battery. This apparatus
had been so ingeniously combined that it did not
weigh more than seven hundred pounds, even including
twenty-five gallons of water in another receptacle.
The instruments provided for the journey consisted of
two barometers, two thermometers, two compasses, a sextant,
two chronometers, an artificial horizon, and an altazimuth,
to throw out the height of distant and inaccessible objects.
The Greenwich Observatory had placed itself at the
doctor's disposal. The latter, however, did not intend to
make experiments in physics; he merely wanted to be
able to know in what direction he was passing, and to
determine the position of the principal rivers, mountains,
and towns.
He also provided himself with three thoroughly tested
iron anchors, and a light but strong silk ladder fifty feet
in length.
He at the same time carefully weighed his stores of
provision, which consisted of tea, coffee, biscuit, salted
meat, and pemmican, a preparation which comprises many
nutritive elements in a small space. Besides a sufficient
stock of pure brandy, he arranged two water-tanks, each
of which contained twenty-two gallons.
The consumption of these articles would necessarily,
little by little, diminish the weight to be sustained, for it
must be remembered that the equilibrium of a balloon
floating in the atmosphere is extremely sensitive. The
loss of an almost insignificant weight suffices to produce a
very noticeable displacement.
Nor did the doctor forget an awning to shelter the
car, nor the coverings and blankets that were to be the
bedding of the journey, nor some fowling pieces and
outer balloon would go first; and, were it completely
emptied, the smaller one would still remain intact. The
outer envelope might then be cast off as a useless encumbrance;
and the second balloon, left free to itself, would not offer
the same hold to the currents of air as a half-inflated one
must needs present.
Moreover, in case of an accident happening to the outside
balloon, such as getting torn, for instance, the other
would remain intact.
The balloons were made of a strong but light Lyons silk,
coated with gutta percha. This gummy, resinous substance
is absolutely water-proof, and also resists acids and gas
perfectly. The silk was doubled, at the upper extremity of
the oval, where most of the strain would come.
Such an envelope as this could retain the inflating
fluid for any length of time. It weighed half a pound per
nine square feet. Hence the surface of the outside balloon
being about eleven thousand six hundred square feet, its
envelope weighed six hundred and fifty pounds. The envelope
of the second or inner balloon, having nine thousand two
hundred square feet of surface, weighed only about five
hundred and ten pounds, or say eleven hundred and sixty
pounds for both.
The network that supported the car was made of very
strong hempen cord, and the two valves were the object
of the most minute and careful attention, as the rudder of
a ship would be.
The car, which was of a circular form and fifteen feet
in diameter, was made of wicker-work, strengthened with
a slight covering of iron, and protected below by a system
of elastic springs, to deaden the shock of collision. Its
weight, along with that of the network, did not exceed
two hundred and fifty pounds.
In addition to the above, the doctor caused to be constructed
two sheet-iron chests two lines in thickness. These were
connected by means of pipes furnished with stopcocks. He
joined to these a spiral, two inches in diameter, which
terminated in two branch pieces of unequal length, the
longer of which, however, was twenty-five feet in height
and the shorter only fifteen feet.
These sheet-iron chests were embedded in the car in
such a way as to take up the least possible amount of
space. The spiral, which was not to be adjusted until
some future moment, was packed up, separately, along
with a very strong Buntzen electric battery. This apparatus
had been so ingeniously combined that it did not
weigh more than seven hundred pounds, even including
twenty-five gallons of water in another receptacle.
The instruments provided for the journey consisted of
two barometers, two thermometers, two compasses, a sextant,
two chronometers, an artificial horizon, and an altazimuth,
to throw out the height of distant and inaccessible objects.
The Greenwich Observatory had placed itself at the
doctor's disposal. The latter, however, did not intend to
make experiments in physics; he merely wanted to be
able to know in what direction he was passing, and to
determine the position of the principal rivers, mountains,
and towns.
He also provided himself with three thoroughly tested
iron anchors, and a light but strong silk ladder fifty feet
in length.
He at the same time carefully weighed his stores of
provision, which consisted of tea, coffee, biscuit, salted
meat, and pemmican, a preparation which comprises many
nutritive elements in a small space. Besides a sufficient
stock of pure brandy, he arranged two water-tanks, each
of which contained twenty-two gallons.
The consumption of these articles would necessarily,
little by little, diminish the weight to be sustained, for it
must be remembered that the equilibrium of a balloon
floating in the atmosphere is extremely sensitive. The
loss of an almost insignificant weight suffices to produce a
very noticeable displacement.
Nor did the doctor forget an awning to shelter the
car, nor the coverings and blankets that were to be the
bedding of the journey, nor some fowling pieces and
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