Wednesday, April 25, 2012

Scheiner's Helioscope

In Galileo's Library there is a copy of Christoph Scheiner's Rosa Ursina in which one can find a figure showing a helioscope (Liber II, Cap XXXIV, p. 138r):
It appears to be a telescope using eyepiece projection to form an image on a screen. The book is dated 1630.

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