...They vary in number from three to half a dozen or more,and form systems of a more complex character than what are observed inthe case of binary stars... 
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...In the usual construction of a triple system,the secondary star of a binary is resolvable into two, each star beingin mutual revolution, whilst they both gravitate round their primary...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...This has been actually shownto be true in many binary stars; it is believed to be true in all...
Robert Stawell Ball 「The Story of the Heavens」
...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」
...The spectroscope shows that the brighter of these stars isagain a binary system of two huge suns, the components revolving aroundeach other in a period of about twenty days...
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」
...Among the numerous binary stars the orbits of some fifty have beensatisfactorily determined...
Cecil G. Dolmage 「Astronomy of To-day」
...Many double stars, for which this has not yetbeen done, are, however, believed to be, without doubt, binary...
Cecil G. Dolmage 「Astronomy of To-day」
...—In addition to thesethere is a certain further number of binary variables inwhich both components are bright and where the variationof brightness follows a very different course...
George C. Comstock 「A Text-Book of Astronomy」
...The period usuallyassigned to the revolution of this binary system is 117 years, and theperiod of peri-astral passage is said to be 1779...
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」
...They form a binary system ofunknown period...
Garrett Serviss 「Pleasures of the telescope」
...Itis believed to be a swiftly moving binary, whose stars arenever separated widely enough to be distinguished withcommon telescopes...
Garrett Serviss 「Pleasures of the telescope」
...The constellation Eridanus, represented in ,contains a few fine double stars, one of the most interestingof which is 12, a rather close 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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