**5.** We have now jumped to a height of
50,000 meters or 50 kilometers,
that is more than 30 miles, and we notice a second effect of our jumps:
not only are all lengths we see reduced tenfold each time, but the area
which comes into our field of vision increases a hundredfold. So the
above illustration covers a square 15 kilometers on a side, and we see
Bilthoven (1) as a suburb of Utrecht (2). A dotted wavy line symbolizes
a radio wave of 298 meters wave length reaching Bilthoven from the
transmitter southwest of Utrecht, called "Hilversum" after the town (3)
where its studios are. The 1.5-centimeter square in the middle gives
again, as it has done each time, a reduced representation of the
preceding illustration. As this illustration contains a photograph of a
detailed plan of Bilthoven, it just shows the houses, though very
minutely.

1 cm. in picture = 10^{5} cm. = 1,000 m. = 1 km.

Scale = 1:100,000 = 1:10^{5}