Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 337
h cuts the tube into two equal parts horizontally.Thus, half of the heam will pass through air, and halfthrough water; while with a lens, c, a magnified image ofthe adjacent end of the tube is projected on the screen.You see the image, op, composed of two semicircles, oneformed by the light which… … pure white, the water semicircle is a bright and delicateblue-green. Thus, by augmenting the thickness throughwhich the light has to pass, we deepen the colour; provingthereby that the destruction of the light occurs within theabsorbing body, and that it is not an effect of surfacemerely. Melloni…
Heat
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