...All these threeclasses of binary systems are now known to be very numerous... 
E. Walter Maunder 「Are the Planets Inhabited?」
...the primary andsecondary of a binary system are each resolvable into two, forming twopairs, each pair being in mutual revolution, while they both gravitateround their common centre of gravity...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...It is this very fact that elliptic motion is so common in the planets ofthe solar system which renders its discovery in binary stars of suchimportance...
Robert Stawell Ball 「The Story of the Heavens」
...Sirius is also a binary system;but it is what is called a "visual" one, for its component stars may beseen separately in very large telescopes...
Cecil G. Dolmage 「Astronomy of To-day」
...Procyon is also a binary, its companion having been discovered byProfessor J...
Cecil G. Dolmage 「Astronomy of To-day」
...,and their number is rapidly increasing, about one star out ofevery seven whose motion in the line of sight is determinedproving to be a binary or, as in the case of Polaris, possiblytriple...
George C. Comstock 「A Text-Book of Astronomy」
...The period of this binary seems to be about 750years...
Richard A. Proctor 「Half-hours with the Telescope」
...It appears to be a binary, but the motion is veryslow, and nothing certain is yet known of its period...
Garrett Serviss 「Pleasures of the telescope」
...It is clearly a binary, with a longperiod...
Garrett Serviss 「Pleasures of the telescope」
...Antaresis probably a binary, although its binary characterhas not yet been established...
Garrett Serviss 「Pleasures of the telescope」
...Much more interesting, however, is 70, a binary whosecomponents have completed a revolution since theirdiscovery by Sir William Herschel, the period beingninety-five years...
Garrett Serviss 「Pleasures of the telescope」
...It is, no doubt, a binary...
Garrett Serviss 「Pleasures of the telescope」
...They form a binary system ofunknown period...
Garrett Serviss 「Pleasures of the telescope」
...Its near neighbor, Σ 2054, maybe a binary...
Garrett Serviss 「Pleasures of the telescope」
...It is regarded as a binary of long and as yetunascertained period...
Garrett Serviss 「Pleasures of the telescope」
...It is a slow binary of magnitudes fourand four, distance 3...
Garrett Serviss 「Pleasures of the telescope」
...It is probablya binary...
Garrett Serviss 「Pleasures of the telescope」
...Later he said: “I adhere to the conviction thatProcyon and Sirius form real binary systems, consisting of a visible and aninvisible star...
George Forbes 「History of Astronomy」
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