Six lectures on light : delivered in America in 1872-1878 (1886)
Tyndall, John, 1820-1893 · New York : D. Appleton · leaf 212
over tlie resemblances of light and heal. As regardsreflection from plane surfaces, we may employ a looking-glass to reflect the light. Marking any point in tlietrack of the reflected beam, cutting off the light bythe dissolved iodine, and placing the pile at the markedpoint, the needle immediately… … employed in our first lecture (fig. 3, p. 11); movingthe index attached to the mirror along the divisionsof our graduated arc (M 0), and determining by thepile the positions of the invisible reflected beam, weprove that the angular velocity of the heat-beam, likethat of the light-beam, is twice…
Light
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