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