File:EB 9th Volume23 Telescope Fig 27.jpg
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![File:EB 9th Volume23 Telescope Fig 27.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a7/EB_9th_Volume23_Telescope_Fig_27.jpg/551px-EB_9th_Volume23_Telescope_Fig_27.jpg?20180912231111)
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