How to construct a mounting for a refracting telescope so that the Sun's image could be projected onto a screen and sunspots safely studied. A second screen at R blocked out indirect sunlight and made it possible to use the instrument without a camera obscura. From 'Rosa Ursina' by Christoph Scheiner (Bracciano, 1630). Engraving.

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Photo credit: © World History Archive / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., archival, archive, astronomy, blocked, camera, christoph, construct, engraving., historical, history, image, indirect, instrument, mounting, obscura., projected, refracting, rosa, safely, scheiner, science, scientific, screen, studied., sun, sunlight, sunspots, telescope, ursina

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