ISBN: 9780217083829

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustra… Plus…

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated.1901 Excerpt: ... 203 CHAPTER X. WRITINGS AND EXPERIMENTAL INVESTIGATIONS. Could the whole of Sir John Herschel''s astronomical career be obliterated, and the whole of his contributions to pure mathematics be forgotten, he would still merit celebrity as a physicist. Experimental optics, abqve all, engaged his attention. Light, he himself said, was his first love, and he was never wholly forgetful of it. In 1830 he described himself as forcibly drawn aside from his optical studies by the claims of nebulae and double stars. How strong he felt those claims to be, can best be understood by considering the firmness with which he averted his mind, out of regard to them, from the intricate and bewitching subject of his early devotion. I understand from Peacock, Dr. VVhewell wrote to him, June 19, 1818, that you are untwisting light like whipcord, examining every ray that passes within half a mile, and putting the awful question, '' Polarised, or not polarised?'' to thousands that were never before suspected of any intention but that of moving in a straight line. These interrogatories brought out a remarkable diversity in the action upon light of quartz, and other similar substances, corresponding with the two different modes of crystallisation belonging to each of them. Here, in Lord Kelvin''s phrase, is one of the most notable meeting-places between natural history and natural philosophy. The nascent science of spectrum analysis was materially promoted by HerscheL He noticed in 1819 the distinctive light-absorbing qualities of coloured media, studied the spectra of various flames, adverted to the definiteness and individuality of the bright lines composing them, and recommended their employment for purposes of chemical identification. A year later, he developed and modifi... Agnes Mary Clerke, Books, History, The Herschels and Modern Astronomy Books>History This is an OCR edition without illustrations or index. It may have numerous typos or missing text. However, purchasers can download a free scanned copy of the original rare book from GeneralBooksClub.com. You can also preview excerpts from the book there. Purchasers are also entitled to a free trial membership in the General Books Club where they can select from more than a million books without charge. Original Published by: Cassell and Co. in 1901 in 233 pages; Subjects: Astronomy; Science / Astronomy; History / General; Juvenile Nonfiction / Science & Nature / Astronomy; Nature / Star Observation; Science / Astronomy; Science / Astrophysics & Space Science;<

ISBN: 9780217083829

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustra… Plus…

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated.1901 Excerpt: ... 203 CHAPTER X. WRITINGS AND EXPERIMENTAL INVESTIGATIONS. Could the whole of Sir John Herschel''s astronomical career be obliterated, and the whole of his contributions to pure mathematics be forgotten, he would still merit celebrity as a physicist. Experimental optics, abqve all, engaged his attention. Light, he himself said, was his first love, and he was never wholly forgetful of it. In 1830 he described himself as forcibly drawn aside from his optical studies by the claims of nebulae and double stars. How strong he felt those claims to be, can best be understood by considering the firmness with which he averted his mind, out of regard to them, from the intricate and bewitching subject of his early devotion. I understand from Peacock, Dr. VVhewell wrote to him, June 19, 1818, that you are untwisting light like whipcord, examining every ray that passes within half a mile, and putting the awful question, '' Polarised, or not polarised?'' to thousands that were never before suspected of any intention but that of moving in a straight line. These interrogatories brought out a remarkable diversity in the action upon light of quartz, and other similar substances, corresponding with the two different modes of crystallisation belonging to each of them. Here, in Lord Kelvin''s phrase, is one of the most notable meeting-places between natural history and natural philosophy. The nascent science of spectrum analysis was materially promoted by HerscheL He noticed in 1819 the distinctive light-absorbing qualities of coloured media, studied the spectra of various flames, adverted to the definiteness and individuality of the bright lines composing them, and recommended their employment for purposes of chemical identification. A year later, he developed and modifi... Agnes Mary Clerke, Books, History, The Herschels and Modern Astronomy Books>History, General Books LLC<

ISBN: 021708382X

Paperback, [EAN: 9780217083829], General Books LLC, General Books LLC, Book, [PU: General Books LLC], General Books LLC, 65, History, 271237, Ancient History & Civilisation, 276416, Archa… Plus…

Paperback, [EAN: 9780217083829], General Books LLC, General Books LLC, Book, [PU: General Books LLC], General Books LLC, 65, History, 271237, Ancient History & Civilisation, 276416, Archaeology, 271343, Britain & Ireland, 271480, Europe, 271565, North America, 271411, Military History, 772016, Maritime History, 771710, Political History, 772148, Social & Economic History, 772162, Cultural History, 771714, Religious History, 271389, Other Historical Subjects, 771724, Essays, Journals, Letters & True Accounts, 271605, Reference, 771718, World History, 771708, Countries & Regions, 4119251, Academic History, 1025612, Subjects, 266239, Books<

ISBN: 9780217083829

Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce and increasingly expensive. We are republishing these classic works in afforda… Plus…

Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce and increasingly expensive. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork. Books, History~~General, Herschels-and-Modern-Astronomy~~Agnes-Mary-Clerke, , , , , , , , , , General Books LLC<