File:EB 9th Volume23 Telescope Fig 21.jpg
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![File:EB 9th Volume23 Telescope Fig 21.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/8/82/EB_9th_Volume23_Telescope_Fig_21.jpg/309px-EB_9th_Volume23_Telescope_Fig_21.jpg?20180912231106)
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