Star-land : being talks with young people about the wonders of the heavens (1891)
Ball, Robert S. (Robert Stawell), Sir, 1840-1913 · London ; Paris : Cassell & Co. · leaf 110
il they use both eyes together, of which one is ap-plied to the telescope, while the other is directed to themoon (Fig. 37). It will then be seen, even with a verysmall instrument, that the telescopic moon is as big as The Moon. 95 the larger of the two crescents in the adjoining figure,while the… … Fig. 37.—Demonstration of the Advantage of Using a Telescope. thousand miles away, it would, when viewed by one ofthese mighty instruments, be seen as large as our unaidedvision would show it were the body only a single miledistant. No doubt this is a large accession to ourpower, but it often falls…
Astronomy
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