Title

How to construct a mounting for a refracting telescope

Caption

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.

Info+

Photos12.com - Ann Ronan Picture Library

Credit line

Photo12/Ann Ronan Picture Library

Reference

ARP07113_010556P

License type

Rights managed

Available size

34,0Mb (1,8Mb) / 11,2in x 11,8in / 3352 x 3543 (300dpi)