50.2 MB (1.4 MB compressed)
4362 x 4024 pixels
36.8 x 34.0 cm ⏐ 14.5 x 13.4 in (300dpi)
ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY
Herschel telescope, artwork. This is one of more than 400 telescopes designed by the German-born British astronomer William Herschel (1738-1822). This model is similar in size and design to the 10-foot telescope (R102/174), which had a 3-metre- long tube. Other models were the 7-foot, 20-foot and 40-foot telescopes. This one is mounted on a wheeled frame so that it can be moved to point in the right direction, and various mechanisms allow the angle to be adjusted as needed. The observer would use a ladder to make observations by looking down an eyepiece on the side of the tube (upper left) at an image that was projected to the side by the primary mirror in the base of the telescope. The mirror was made of polished metal, instead of glass. Herschel's discoveries included Uranus (1781) and several moons of Saturn and Uranus.
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