e dark and not the light rays that waB repeated with the spectrum thus obtained. A sheet of to awaken sensation on the retina. The atmosphere, which is produce these effects, Professor Tyndall placed the thermo- paper properly prepared, on which a rose with leaves a mechanical mixture of oxygen and… … alum cell, A, cuts off the light, but the needle is found deflec- platinum coated with platinum black in the same position. ted though no light appears at the focus. Platinum, he explained, with its surface thus prepared acts in regard to the invisible heat rays just as the sulphate of POLARIZATION…
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