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Updated: May 25, 2025
Introducing a plate of quartz between the polarizer and the spar, the two images glow with complementary colours. Employing the image of an aperture instead of that of the carbon-points, we have two coloured circles. As the analyzer is caused to rotate, the colours pass through various changes: but they are always complementary.
The Heat of the Electric Beam. Ignition through a Lens of Ice. Possible Cometary Temperature. But the waves from our incandescent carbon-points appeal to another sense than that of vision. They not only produce light, but heat, as a sensation.
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