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$: How to construct a mounting for a refracting telescope$

How to construct a mounting for a refracting telescope

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

Picture No

13902066

Media ID

48421229

Size

2600px x 2748px (1.1MB)

Credit

World History Archive / Mary Evans Picture Library

Source

World History Archive

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1630 Blocked Bracciano Christoph Construct Indirect Mounting Obscura Onto Possible Projected Refracting Rosa Safely Scheiner Studied Sunspots Telescope Ursina

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