Page:The wonders of optics (1869).djvu/179

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THE TELESCOPE.
171

the use of ordinary telescopes in a nearly upright condition. The mirror will bear a power of 220 diameters, Foucault's Small Telescope.
Fig. 49.—Foucault's Small Telescope.
and shows the mountains of the moon, the phases of Mercury and Venus, Saturn and his ring, Jupiter and