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Galileo and his Galileo and his TelescopeTelescope
Practical Optics and Practical Optics and CosmologyCosmology
Albert Van HeldenRice University
University of Utrecht
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The telescope was invented by children playing with
lenses?
. . . . .
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Hans Lipperhey’s
patent applicationOktober 1608
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Jacob Metius of Alkmaar
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And then there was also
Sacharias Jansen
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Giovanni Battista della Porta
1535-1615
Concave lenticulars show things clearer but smaller. Convex lenticulars show things larger but fuzzy.
If you know how to put the two together, you will be able to help near-sighted as well as far-sighted people. Magia Naturalis, 1589
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Gio. Battista Della Porta to Federico Cesi28 augustus 1609
“e una coglionaria et e preso dal mio libro 9 De refractione”
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Italian Spyglass
First half of the 17th centurylength 21 cm, magnification 4×
courtesy of R. Willach
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French telescope, ca. 1620
length 63 cm, magnification 14×
courtesy of R. Willach
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1610 1616
Il saggiatore, 1623