...There are many variables of the Algol type, and information issteadily accumulating... 
George Forbes 「History of Astronomy」
...Roberts, in South Africa, has done splendid work on the periods of variables ofthe Algol type...
George Forbes 「History of Astronomy」
...It is at one apex of thepentagon, about 15° east of Al Rischa in Pisces, and 37° directlysouth of Algol...
William Tyler Olcott 「A Field Book of the Stars」
...The variable star Algol orCaput Medusæ, which marks the head of Gorgon, was accounted 'the mostunfortunate, violent, and dangerous star in the heavens...
Richard A. Proctor 「Myths and Marvels of Astronomy」
...The following are the approximate elements ofthe Algol system found by Vogel:—...
Robert Stawell Ball 「The Story of the Heavens」
...For the other leading type of variablestar, Algol, of which mention has already been made, is the bestinstance...
Cecil G. Dolmage 「Astronomy of To-day」
...It is to the second of these types that Algol is supposedto belong...
Cecil G. Dolmage 「Astronomy of To-day」
...There are at the present time (1901) 34 spectroscopicbinaries known, including among them such stars as Polaris,Capella, Algol, Spica, βAurigæ, ζUrsæ Majoris, etc...
George C. Comstock 「A Text-Book of Astronomy」
...The Algol variables...
George C. Comstock 「A Text-Book of Astronomy」
... De Peyster and Allaben: Algol, preface...
Dorothy Stimson 「The gradual acceptance of the Copernican theory of the universe」
...An interesting variable,of the type of Algol, is λ, which at maximum is ofmagnitude three and four tenths and at minimum of magnitudefour and two tenths...
Garrett Serviss 「Pleasures of the telescope」
...The chief attraction in Perseus is the changeful andwonderful β, or Algol, the great typical star among theshort-period variables...
Garrett Serviss 「Pleasures of the telescope」
...The diameter of Algol is believed to be about1,125,000 miles, that of the dark body about 840,000 miles,and the mean distance from center to center 3,230,000miles...
Garrett Serviss 「Pleasures of the telescope」
...It was bysupposing the existence of a dark companion to Algol that its discoverer,Goodricke of York, in 1783, explained variable starsof this type...
George Forbes 「History of Astronomy」
...But all variable stars do not suffer the suddenvariations of Algol...
George Forbes 「History of Astronomy」
...The most easterly one is βPersei, known as Algol, the famous variable...
William Tyler Olcott 「A Field Book of the Stars」
...The most interesting variable star in the heavens is Algol (the demon),in the constellation Perseus...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
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