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Curious Experiment On Rays Of Light

That the rays of light flow in all directions from different bodies,

without interrupting one another, is plain from the following

experiment:--Make a little hole in a thin plate of metal, and set the

plate upright on a table, facing a row of lighted candles standing

near together; then place a sheet of paper or pasteboard at a little

distance from the other side of the plate; and the rays of all the

candles, flowing through the hole, will form as many specks of light

on the paper as there are candles before the plate; each speck as

distinct and large as if there were only one candle to cast one speck;

which shows that the rays do not obstruct each other in their motions,

although they all cross in the same hole.