Journeys from place to place over established
routes are made in large tubes, in which the cars are propelled by
electricity. These tubes run both on land and water, being suspended in
the latter a little way below the surface. Both tubes and cars are air-
tight, and the adjustment is so perfect that the cars slide along with the
greatest ease. Riding in an air-tight chamber would not be pleasant if
much time were to be occupied in that way, but the cars are propelled so
swiftly that the time from one station to another is hardly appreciable.
At every stop the cars are opened and apparatus set in motion which
changes the air completely almost in a moment. Where the tubes run under
water shafts for air are put in at the stations. There is always a double
line, one tube for each direction. No chance is left for accidents.
"Of course we navigate the air, swiftly and safely. If not in too much
haste we always take the aerial passage, and often on a pleasant day the
sky over a great city will be as full of air ships, or balloons as we
still sometimes call them, as its harbor is of pleasure boats.
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