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Updated: May 14, 2025
Better and more costly is an apparatus called a helioscope, constructed on the principle of polarization and provided with prisms and reflectors which enable the observer, by proper adjustment, to govern very exactly and delicately the amount of light that passes into the eyepiece.
Among the pomelo-trees is a cyclone of scarcely visible things. Motes and specks of light dance in disorderly figures, to be detected as animated objects only by gauzy wings catching the light and reflecting it. Each insect, wakened but an hour ago by the warmth of the moist soil, in an abandonment of the moment, is a helioscope transmitting signals of pure pleasure.
The art of celestial photography, however, was even then in a purely tentative stage, and Carrington wisely resolved to waste no time on dubious experiments, but employ the means of registration and measurement actually at his command. These were very simple, yet very effective. To the "helioscope" employed by Father Scheiner two centuries and a quarter earlier, a species of micrometer was added.
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