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.

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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DETAILS
Image Number: 1746-19625285Rights ManagedCredit Line:World History Archive/Image Asset Management/SuperStockCollection:Image Asset ManagementContributor:World History ArchiveModel Release:NoProperty Release:NoResolution:2600×2748
1630
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