...The most easterly one is βPersei, known as Algol, the famous variable... 
William Tyler Olcott 「A Field Book of the Stars」
...Note the famousvariable Algol the Demon star...
William Tyler Olcott 「A Field Book of the Stars」
...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 most celebrated of all the variable stars is that known as Algol,whose position in the constellation of Perseus is shown in ...
Robert Stawell Ball 「The Story of the Heavens」
...We shall see in a following chapter how it has been provedthat the variability of Algol is due to the occasional interposition ofa dark companion which cuts off a part of the lustre of the star...
Robert Stawell Ball 「The Story of the Heavens」
...Assuming the orbit to be circular,the velocity of Algol was found to be twenty-six miles per second...
Robert Stawell Ball 「The Story of the Heavens」
...The Algol system appears to be composed of a body about asbroad as our sun, which regularly eclipses a brighter body which has adiameter about half as great again...
Cecil G. Dolmage 「Astronomy of To-day」
...Since the companion of Algol is often spoken of as a dark body, itwere well here to point out that we have no evidence at all that it isentirely devoid of light...
Cecil G. Dolmage 「Astronomy of To-day」
...The Algol variables...
George C. Comstock 「A Text-Book of Astronomy」
...In other words, once in every two daystwenty hours and forty-nine minutes Algol, as seen fromthe earth, undergoes a partial eclipse...
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」
...Not far off is a very curious star, β of Perseus, or Algol, whichforms a little triangle with two others smaller than itself...
Camille Flammarion Frances A. Welby 「Astronomy for Amateurs」
...We are already acquainted with the variations of Algol, in Perseus, dueto its partial eclipse by a dark globe gravitating in the line of ourvision...
Camille Flammarion Frances A. Welby 「Astronomy for Amateurs」
...Note a dull red star near Algol, and a pretty pair just above Algenib...
William Tyler Olcott 「A Field Book of the Stars」
...—A line drawn from the star γ Pegasi to Algol in Perseuspasses through β Trianguli...
William Tyler Olcott 「A Field Book of the Stars」
...Stars of this class are all very remote, and noattempt has as yet been made to ascertain the parallax of Algol...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...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」
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