Six lectures on light : delivered in America in 1872-1878 (1886)
Tyndall, John, 1820-1893 · New York : D. Appleton · leaf 144
he axis is greater than the elasticityat right angles to it. Consider, then, a system ofwaves crossing the crystal in a direction perpendicularto the axis. Two directions of vibration are open tosuch waves : the ether particles can vibrate parallelto the axis or perpendicular to it. They do both,… … double refraction is capable of easy illustration. Causingthe beam which builds the image of our carbon-pointsto pass through the spar, the single image is instantlydivided into two. Projecting (by the lens E, fig. 28)an image of the aperture (L) through which the lightissues from the electric…
Light
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