5 Matching Annotations
  1. Oct 2022
  2. Jul 2022
    1. Newton’s discovery of the differing refrangibility of colors indicated to him how telescope lenseswould always produce ill-focused images because of chromatic aberration. In order to avoid the use oflarge lenses, he devised the reflecting telescope

      Because light of different colors refracts at different angles, attempting to focus light using curved lenses will cause the focus point of each to be slightly different and thus not focus in total.

      This chromatic aberration means that one cannot build large functional refracting telescopes.

      As a result of this discovery about chromatic aberration in optics, Isaac Newton built reflecting telescopes instead. A large mirror collects the light and reflects it through a very thin lens, which doesn't accentuate refraction the way very large and thick lenses would have in a refracting telescope.

  3. Aug 2021
  4. May 2021
    1. Newton's Waste Book (MS Add. 4004) The most cherished legacy that Newton received from his stepfather, Barnabas Smith (1582-1653), seems to have been this vast manuscript commonplace book Add. 4004. Smith was rector of North Witham, a wealthy clergyman who married Newton’s mother on 27 January 1646. The immediate consequence of this union was that the three-year old Isaac Newton had to be sent to live with his grandmother. On Smith’s death, Newton appears to have inherited his library, most of which he gave away much later in life to a kinsman in Grantham. Smith himself had made extensive use of these books, in compiling a volume of theological commonplaces. This consisted of hundreds of folios bound in pasteboard, ruled at the top and in the margin of each folio to allow space for a heading and references to each entry. Newton was not interested by the very pedestrian efforts in divinity, largely the culling of quotations, with which Smith had begun to fill the book since its inception on 12 May 1612. He wanted its paper, as the title that he wrote on its original cover in February 1664 (‘Waste Book’) suggested.

      Here's the beginning of the digital example of Isaac Newton's Waste Book.

  5. Jul 2018
    1. I buy into Newton’s philosophy that we see further by standing on the shoulders of giants.

      I take his general point here, and Newton said something along these lines, but I wouldn't call it "Newton's philosophy". If anything this philosophy is really the scientific method and Newton didn't invent it.