Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 9
red light waves in the sunlight fallon your hand at the rate of 390 millionmillion per second and in six seconds390 X 6 = 2340 million million fell onyour hand. Your hand received manymore than this because waves of all colorsfell on it, and of violet light alone itreceived twice the above number.… … TO MAKE YOUR DARK ROOM Boys, you are going to makemany experiments with a beam ofsunlight let into a darkened room,so prepare for them now thor-oughly, as follows: Select in your home a roomwith only one window, facing thesouth or east or west. Now coverthis window so that no light canenter the…
Light · Scientific recreations
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