24 inch Clark refracting telescope

24 inch Clark refracting telescope

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Credit: FRANK ZULLO/SCIENCE PHOTO LIBRARY

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Caption: 24 inch Clark refracting telescope at Lowell Observatory, Mars Hill, Flagstaff, Arizona, USA. Unlike most large telescopes, which use mirrors to form the image, a refracting telescope uses lenses. This allows much brighter views and is ideal for conventional photography. The telescope was made by Alven Clark, an American astronomer and telescope maker. It was delivered to Percival Lowell's newly-founded observatory in 1896. He used it to map the canals on Mars, first reported by the Italian astronomer Giovanni Schiaparelli in 1881. The telescope is now used as a public education tool and not for research.

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