50.6 MB (5.9 MB compressed)
4748 x 3727 pixels
40.1 x 31.5 cm ⏐ 15.8 x 12.4 in (300dpi)
SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Siderostat. Century artwork of a large siderostat measuring 1.25 metres in diameter. This flat mirror is turned slowly so that a given region of the sky is continuously reflected into a fixed telescope. Image from 'La Science Illustree' Louis Figuier (1895).
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