File:EB 9th Volume23 Telescope Fig 17.jpg
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![File:EB 9th Volume23 Telescope Fig 17.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/4/41/EB_9th_Volume23_Telescope_Fig_17.jpg/501px-EB_9th_Volume23_Telescope_Fig_17.jpg?20180912231101)
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