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.
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