Herschel's 'small' 20-foot telescope

Numéro d’image : 11879858
Herschel's 'small' 20-foot telescope
Herschel's 'small' 20-foot telescope,artwork. This telescope was designed by the German-born British astronomer William Herschel (1738-1822). The tube was 20 feet (6 metres) long,but was smaller in overall size than the larger 20-foot telescope (see R102/154). This telescope was mounted on a base (left) and suspended from a weighted pole (centre) as it was pointed towards the celestial object being observed. The observer would use a ladder (right) to make observations by looking down an eyepiece on the side of the tube at an image that was projected to the side by the primary mirror in the bottom of the tube. The mirror was made of polished metal,instead of glass. This was one of more than 400 telescopes designed and built by Herschel. Herschel's discoveries included Uranus (1781) and several moons of Saturn and Uranus
Licence : Droits gérés
Crédit: Science Photo Library / Royal Astronomical Society
Taille de l’image : 5488 px × 3772 px
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