Six lectures on light : delivered in America in 1872-1878 (1886)
Tyndall, John, 1820-1893 · New York : D. Appleton · leaf 217
te ofquartz cut perpendicular to the axis; the immediatedeflection of the needlp declares the transmission of theheat, and wlien the transmitted beam is p operly 186 ON LIGHT. I.EC examined, it is found to be circularly polarized, exactlyas a beam of light is polarized under the same con-ditions. §… … beam of invisible heat. To determine the positions ofthe two images, let us first operate upon the totalbeam. Marking the places of the light-images, weintroduce between N and L our ray-filter (not in thefigure) and quench the light. Causing the pile toapproach one of the marked points, the needle…
Light
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