4500. Imagine a silver thread descends from your aircraft straight
down to the ground, and at the end of that thread is a brass plumb bob and its
point is not touching the ground but is just one inch above it.
4501. The ground is level, the plum bob, attached to the
plane by a string is traveling along the road. Since the plane is going one
hundred miles an hour, so also will the plumb bob be going one hundred miles an
hour.
4502. The farm with the silver roof comes into the sight of
the plumb bob and it roars past, it passes the mailbox and the yew bushes to
either side of the mailbox so fast that the letters of the name on the mailbox,
and its number cannot be seen, they are just a blur.
4503. So the plum bob goes on its way down the highway still
roaring along at a hundred miles an hour, but you, up in your passenger seat in
your little plane, see that the barn with the silver roof is going past you as
slow as it is possible for a thing to move.
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