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Updated: May 26, 2025
See gathered a rich harvest of nearly 500 new southern pairs with the Lowell 24-inch refractor in 1897. Professor Hough's discoveries in more northerly zones amount to 623; Hussey's at Lick to 350; and Aitken's already to over 300. There is as yet no certainty that the stars of 61 Cygni form a true binary combination. Mr.
In that year the track of totality crossed Spain, and thither, accordingly, Warren de la Rue transported his photo-heliograph, and Father Secchi his six-inch Cauchoix refractor. The question then primarily at issue was that relating to the nature of the red protuberances.
Man's mind is the most important fact with which we are yet acquainted. Let us not turn then against it and deny its existence with too many brazen instruments, but remember these are but a means, and that the vast lens of the Californian refractor is but glass it is the infinite speck upon which the ray of light will fall that is the one great fact of the universe.
The planet was then within one month of its second nearest approach to the earth during the last century; and in 1845 the Washington 26-inch refractor was not in existence. Professor Asaph Hall, accordingly, determined to turn the conjecture to account for an exhaustive inquiry into the surroundings of Mars.
To this only twenty-two seconds were added by De Vico, as the result of over 10,000 observations made with the Cauchoix refractor of the Collegio Romano, 1839-41. The axis of rotation was found to be much more bowed towards the orbital plane than that of the earth, the equator making with it an angle of 53° 11'.
Yet, though almost necessarily inferred to be equatorial, they made a considerable angle with the trend of the satellites' orbits. More distinctly by the brothers Henry, with the aid of their fine refractor, two gray parallel rulings, separated by a brilliant zone, were discerned every clear night at Paris from January to June, 1884.
I dare not go for fear of losing the place I have marked; yet I can get no further without my Double Refractor. 'Do not let that trouble you, said the short, stout stranger; 'I will be delighted to keep the place exactly marked while you run for your instrument.
The celebrated American opticians, Alvan Clark & Sons, derived from the Birmingham firm the materials for some of their early telescopes, notably the 19-inch Chicago and 26-inch Washington equatoreals; but the discs for the great Lick refractor, and others shaped by them in recent years, have been supplied by Feil of Paris.
Lowell believes he has, with the spectroscope, proved the existence of water on Mars. One of the most unexpected and interesting of all telescopic discoveries took place in the opposition of 1877, when Mars was unusually near to the earth. The Washington Observatory had acquired the fine 26-inch refractor, and Asaph Hall searched for satellites, concealing the planet's disc to avoid the glare.
Displacements which would be conspicuous in stars might easily escape detection in ill-defined, hazy masses. Thus the measures executed by d'Arrest in 1857 have not yet proved effective for their designed purpose of contributing to the future detection of proper motions. Some determinations made by Mr. Burnham with the Lick refractor in 1891, will ultimately afford a more critical test.
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