Six lectures on light : delivered in America in 1872-1878 (1886)
Tyndall, John, 1820-1893 · New York : D. Appleton · leaf 147
light. A moments reflection will show that, if what ishere stated be correct, on placing a second plate oftourmaline with its axis parallel to the first, the lightwill pass through both ; but that, if the axes be crossed,the light that passes through the one plate will bequenched by the other, a… … plate {if t): the green of the crystal is a littledeepened, nothing more; this agrees with our conclu-sion. By means of an endless screw, I now turn one ofthe crystals gradually round, and you observe that aslong as the two plates are oblique to each other, acertain portion of light gets through;…
Light
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