184 Mr. Moseley on the Star Algol. 
On the Recurrence of the Smallest Light of the Variable Star Algol. 
by W. M. Moseley, Esq. Sort 
Blackman Street, March 22, 1824. 
My dear Sir, - 
If you can find a space for the accompanying communication, 
you will render a service topractical astronomy. 
I remain, dear Sir, 
Yours, very truly, 
J. Sourn. 
To W. T. Brande, Esq. 
Winterdyse House, Bewdley, 
March, 20, 1824. | 
** Dear Sir, 
“In compliance with your suggestion, I transmit you a table 
of the recurrence of the smallest light of Algol; the most remarkable 
of all the variable stars; Professor Wurm has inserted in Bode’s 
Jahrbuch. for 1822, p. 119, a table of this periodical change 
during the years 1820, 1821, and 1822, and what I now send, 
is a continuation for the ensuing summer, calculated from the | 
data given in the professor’s introductory dissertation. He 
informs us, that he had verified the period of the change of light, 
by comparing a recent observation of his own, on September, 23rd, | 
1813, with Mr. Goodrich’s, of earliest date, or January 31st, 
1783, after 4540 revolutions had occurred in the interval. The 
complete change occupies eight hours, or eight hours forty mi- 
nutes ; but this period is very difficult to ascertain accurately. 
The star when smailest, appears of the fourth magnitude; but 
when brightest, of the second. It seems, however, from Mr. 
Goodrich’s observations, that when at a maximum, its brightness 
