E e edward emerson barnard (2 Ergebnisse)
Sprache: Englisch
- Hardcover
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In den WarenkorbLeatherbound. Zustand: NEW. BOOKS ARE EXEMPT FROM IMPORT DUTIES AND TARIFFS; NO EXTRA CHARGES APPLY. Leatherbound edition. Condition: New. Leather Binding on Spine and Corners with Golden leaf printing on spine. Bound in genuine leather with Satin ribbon page markers and Spine with raised gilt bands. Pages: 52. A perfect gift fo…r your loved ones. Reprinted from 1902 edition. NO changes have been made to the original text. This is NOT a retyped or an ocr'd reprint. Illustrations, Index, if any, are included in black and white. Each page is checked manually before printing. As this print on demand book is reprinted from a very old book, there could be some missing or flawed pages, but we always try to make the book as complete as possible. Fold-outs, if any, are not part of the book. If the original book was published in multiple volumes then this reprint is of only one volume, not the whole set. IF YOU WISH TO ORDER PARTICULAR VOLUME OR ALL THE VOLUMES YOU CAN CONTACT US. Resized as per current standards. Sewing binding for longer life, where the book block is actually sewn (smythe sewn/section sewn) with thread before binding which results in a more durable type of binding. Volume c.1 Language: English Pages: 52 Volume c.1.
Weitere BilderVerlag: Sacramento: University of California, 1913., 1913
- Hardcover
- Erstausgabe
Anbieter: Ted Kottler, Bookseller, Redondo Beach, CA, USATed Kottler, Bookseller
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In den WarenkorbHardcover. Zustand: Very Good. No Jacket. 1st Edition. First Edition. 46 pp; 129 plates. Original cloth, 4to. Text block cleanly separated from binding; reparable. Very Good. 'Of great importance was the beginning Barnard made in photographing the Milky Way. It can fairly be said that, although photography had been used in astro…nomy to a limited and somewhat experimental extent, it was not until Barnard's wholesale use of it that the technique became a vital and spectacular part of regular astronomical observing. His initial labors in this area were not easy, because funds for >equipment were scarce, and he was the junior member under a somewhat crusty and autocratic director, E. S. Holden. Barnard was obliged to use a small telescopic camera, contrived from a 2 1/2-inch portrait lens with a focal length of thirty-one inches, initially strapped to the side of a 6 1/2-inch telescope for want of a suitable mounting and guiding arrangement. With so small a telescope, exposures were necessarily very long; moreover, photographic materials were still rather primitive and insensitive. Nevertheless, Barnard's Milky Way photographs revealed a wealth of both bright and dark nebulae, and star-clouds hitherto unknown. The long exposures (up to six hours) were made with extreme difficulty and required great patience, for the guiding telescopes were without illuminated reticles. He was obliged to use fine iron wires for cross hairs, and to throw the image of a bright star out of focus, maintaining equal intensity in all four quadrants separated by the wires' silhouette. Many of these remarkable photographs of the Milky Way and clusters, as well as of comets, were later assembled into Volume 11 of the Publications of the Lick Observatory [offered here]' (D.S.B I: 465).
