Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 593
he accumulated effect of all the light which has fallen on it during the whole timeof exposure,—often several hours,—while theeye retains an impression for only a fractionof a second, otherwise the impression of anobject seen would gain in intensity the longerwe looked at it. As telescopes gained… … A STAR CLUSTER. Without high magnifying power it looks like a nebula. St. Nicholas readers have ever noticed anebula. Only a half-dozen or so are brightenough to be seen by the naked eye, and theseare not conspicuous enough to attract atten-tion : mere patches of whitish light, like a littlecloud,…
Children's literature
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