An investigation of the eighteenth-century achromatic telescope.
The optical quality and properties of over 200 telescopes residing in museums and private collections have been measured and tested with the goal of obtaining new information about the early development of the achromatic lens (1757-1770). Quantitative measurements of the chromatic and spherical aber...
| Publicado en: | Annals of Science Vol. 67; no. 2; pp. 149 - 187 |
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| Formato: | Artículo |
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Taylor & Francis Ltd
Apr2010
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=49143356&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 49143356 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00033790 7J1 jtl: Annals of Science issn: 00033790 maglogo: Y pubinfo: dt: Apr2010 vid: 67 iid: 2 pid: 377 pub: Taylor & Francis Ltd artinfo: ui: 49143356 10.1080/00033790903497110 ppf: 149 ppct: 38 formats: fmt: – @attributes: type: T – @attributes: type: P size: 511KB tig: atl: An investigation of the eighteenth-century achromatic telescope. aug: au: Jaecks, DuaneH. affil: Department of Physics and Astronomy, University of Nebraska, Lincoln, NE, 68588, USA su: Achromatism Telescopes Lenses Dollond, John Dollond, Peter Maskelyne, Nevil Hall, Chester Moor sug: subj: Achromatism Telescopes Lenses Dollond, John Dollond, Peter Maskelyne, Nevil Hall, Chester Moor ab: The optical quality and properties of over 200 telescopes residing in museums and private collections have been measured and tested with the goal of obtaining new information about the early development of the achromatic lens (1757-1770). Quantitative measurements of the chromatic and spherical aberration of telescope objective lenses were made and are discussed within the context of John and Peter Dollond's description of their efforts to overcome these two optical defects inherent in any single lens. Their work was chronicled in the Philosophical Transactions of 1758 and 1765. An important finding of this investigation is that a particular form of the achromatic lens that has been suggested as being a rare and early form by some investigators, and presumably introduced by Chester Moor Hall, was in fact found to be numerous and present in most museums and many private collections. It is shown that the colour correction of an early eighteenth-century doublet telescope objective is very sensitive to the ratio of the flint to crown glass focal lengths, as well as the variations of the indices of refraction with colour. This sensitivity would preclude any simple recipe for constructing an achromatic lens. The third order theory of spherical aberration of Nevil Maskelyne is reexamined, in which he pointed out that John Dollond developed a theoretical formula equivalent to what today is called geometric third order spherical aberration theory. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y custom: Copyright of Annals of Science is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. item: Annals of Science holder: Taylor & Francis Ltd dt: @attributes: year: 2010 holdings: @attributes: islocal: N |
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