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ditions. I believe it could be done with a
smaller balloon than that with which Zep-
pelin experimented on the Lake of Geneva.
A powerful motor, giving several hundred
horse-power, would be necessary, but big
motors are lighter in proportion than small
ones, and a suitable motor could doubtless be
made.
For a long journey like that between Eu-
rope and America you would require a power-
ful balloon, capable of resisting a certain
amount of rough weather and able to rise
and fall easily, so that the aeronaut could
seek his own currents. If you rise to a height of 5.000 yards from the ground, you
