Herschel, John F. W. (John Frederick William), Sir, 1792-1871 · London : Longman, Brown, Green, Longmans, and Roberts · leaf 646
agnifying power, each individual is perceived to be beautifully and closely double, the one pair being about 2|-", the other about 3" asunder. Each of the stars £ Cancri, £ Scorpii, 11 Monoce¬ rotis, and 1 2 Lyncis consists of a principal star, closely double, and a smaller and more distant… … companied by two excessively minute and very close com¬ panions (as in the annexed figure), to perceive both which is one of the severest tests which can be applied to a telescope. (838.) Of the “delicate” sub-class of double stars, or those consisting of very large and conspicuous principal stars,…
Astronomy
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