26.0 MB (1.4 MB compressed)
2667 x 3413 pixels
22.6 x 29.0 cm ⏐ 8.9 x 11.4 in (300dpi)
D.A. CALVERT, ROYAL GREENWICH OBSERVATORY SCIENCE PHOTO LIBRARY D.A. CALVERT, ROYAL GREENWICH OBSERVATORY SCIENCE PHOTO LIBRARY
Replica of Galileo's telescope, the first type of astronomical telescope, built in 1609 by Galileo from a design of 'magic tubes' by Hans Lippershey. It is made from a single long-focus object lens & a powerful negative lens as the eyepiece. Galileo's best telescopes had a magnification of about 30 times.
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