Poland, 16th Century AD

21 images Created 17 Jul 2017

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$Projecting the sun's image through a refracting telescope onto a screen in a darkened room (camera obscura) in order to study sunpots. From 'Selenographia' by Johannes Hevelius (Gedani, Gdansk. Danzig, 1647). Engraving.$

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$Method of projecting the sun's image through a refracting telescope onto a screen in a darkened room (camera obscura) in order to study sunpots. From 'Selenographia' by Johannes Hevelius (Gedani, Gdansk. Danzig, 1647). Engraving.$

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$Hevelius observing with a wooden-tubed refracting telescope some 30 feet (9.144m). The block-and-tackle and rope mounting was not inconvenient. From 'Selenographia' by Johannes Hevelius (Gedani, Gdansk. Danzig, 1647). Engraving.$

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$Hevelius's plan for a tower observatory, showing various telescopes, including his 150-ft (16.240m) refracting telescope. From 'Selenographia' by Johannes Hevelius (Gedani, Gdansk, Danzig, 1647). Engraving.$

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$Projecting the sun's image through a refracting telescope onto a screen in a darkened room (camera obscura) in order to study sunpots. From 'Selenographia' by Johannes Hevelius (Gedani, Gdansk. Danzig, 1647). Engraving.$

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$Hevelius observing with a wooden-tubed refracting telescope some 30 feet (9.144m). The block-and-tackle and rope mounting was not inconvenient. From 'Selenographia' by Johannes Hevelius (Gedani, Gdansk. Danzig, 1647). Engraving.$

010551 (1).jpg
$Method of projecting the sun's image through a refracting telescope onto a screen in a darkened room (camera obscura) in order to study sunpots. From 'Selenographia' by Johannes Hevelius (Gedani, Gdansk. Danzig, 1647). Engraving.$

010550 (1).jpg
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