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29.7 x 20.3 cm ⏐ 11.7 x 8.0 in (300dpi)
SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Herschel's 20-foot telescope. Illustration of the 20-foot (6 metre) reflecting telescope built by astronomer William Herschel (1738-1822). Herschel built his own telescopes, laboriously grinding the lenses himself to near perfection. This was his most successful instrument; with it he discovered two new satellites of Uranus - Titania and Oberon.
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