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The Artificial Rainbow

Opposite a window into which the sun shines direct suspend a glass
globe, filled with clean water, by means of a string that runs over a
pulley, so that the sun's rays may fall on it. Then drawing the globe
gradually up, you will observe, when it comes to a certain height, and
by placing yourself in a proper situation, a purple colour in the
glass; and by drawing it up gradually higher, the other prismatic
colours, blue, green, yellow, and red, will successively appear; after
which, the colours will disappear, till the globe is raised to about
fifty degrees, when they will again appear, but in an inverted order,
the red appearing first, and the blue or violet last; on raising the
globe a little higher, they will totally vanish.

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