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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