OCR Text |
Show Scientific 'Photography. Photography at Cambridge has already produced several series of plates, each . plate covering a section of the northern sky, the whole of which, when perfected and collated, will be a self recorded and so indisputable atlas, showing the position posi-tion of all stars down to the eleventh magnitude. It will be an atlas in sheets of glass, and frailer in some respecta than if composed of sheets of papef. But for study of the science the glass i better than any product of theengraver's art, and better than any svn picture printed by the plate itself. . Indeed, it is one of the triumphs of the photographio method that a perfect photographio negative neg-ative discloses more to the student than does a telescopio view of that area of the sky of which the photograph is a copy. Astronomical research is constantly made at the observatory in this manner, and with results equal to or better than those reached by former methods. ,'. . Celestial objects are thus originally discovered, and the positions of familiar objects remeasured or otherwise compared, com-pared, and this work might be continued throughout the whole twenty-f onr hours were it so desired, regardless of the glare of the snn by day or of impenetrable clouds by night Boston Traveler. |