Lectures on light, delivered in the United States in 1872-'73; with an appendix (1873)
Tyndall, John, 1820-1893 · New York, Appleton · leaf 121
pon the screen. The experiment may be varied inthis way: Placing in front of the polarizer a plate of un-annealed glass, you have those beautiful colored rings,intersected by a black cross. Every sweep of the rubbernot only abolishes the rings, but introduces complemen-tary ones, the black cross… … But we have to follow the ether still further.Suspended before you is a pendulum, which, when CIRCULAR POLARIZATION. 117 drawn aside and then liberated, oscillates to and fro.If, when the pendulum is passing the middle point ofits excursion, I impart a shock to it tending to drive itat right angles…
Optics
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