Tubeless telescope described by Huygens, 17th century

Numéro d’image : 12991743
Tubeless telescope described by Huygens, 17th century
Tubeless telescope described by Huygens, 17th century. At top are the eyepiece and objective mounts and connecting string. This telescope was described by Dutch astronomer Christiaan Huygens (1629-1695) in his 'Astroscopia Compendiaria' (1684). It was referred to as a tubeless aerial telescope. An aerial telescope is a refracting telescope with a very long focal length that does not use a tube. This one is 65 metres long. Illustration published in 'Astroscopia Compendiaria' (1684).
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Crédit: Science Photo Library / ETH-Bibliothek Zürich
Taille de l’image : 2866 px × 3657 px
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