Page:A Voyage in Space (1913).djvu/113

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JOURNEYING BY TELESCOPE
93

telescopes. They were made with mirrors—reflecting telescopes, as they are called—and they ceased to be so very thin. Indeed, on the contrary, they became quite fat, for there is a great advantage in having the mirror as wide as possible: W. Herschel at his great Telescope. you can see much more clearly with a wide telescope than with a narrow one, always assuming that the wide one is just as well made. But it is much harder to make a big wide mirror than a little one, just as it is harder to get 100 runs at cricket than to get ten; the batsman may play several overs successfully, but he has to be terribly careful not to make a mistake if he