London ( CNN ) -- A huge collection of papers belonging to pioneering scientist Sir Isaac Newton -- the father of gravity -- has been posted online by Cambridge University . The archive includes Newton 's college notebooks and some of his most important writings from the 1660s on mathematics and calculus , optics and gravity . They appear alongside an annotated copy of `` Principia Mathematica , '' the book in which Newton set out his laws of motion and gravity , and which is regarded as one of the world 's most significant scientific works . More than 4,000 pages of Newton material have been digitized so far , with archivists photographing and uploading as many as 200 pages a day . Grant Young , the library 's digitization manager , said the collection contained `` perhaps some of the most important papers and documents in the history of science , '' which would give viewers a valuable insight into Newton 's working methods . `` Anyone , wherever they are , can see at the click of a mouse how Newton worked and how he went about developing his theories and experiments , '' he said . `` Before today , anyone who wanted to see these things had to come to Cambridge . Now we 're bringing Cambridge University Library to the world . '' Many of the papers -- some of them badly damaged by fire or water -- have undergone delicate conservation work before being added to the archive . They are also accompanied by transcriptions by the University of Sussex 's Newton Project , allowing readers to decipher Newton 's handwriting . But some of the notes added to the papers over the years suggest some of the scientist 's contemporaries may not have approved of the online publication . Several of the manuscripts contain the line `` not fit to be printed , '' written by Thomas Pellet , who was asked to review Newton 's work after his death . The Newton archive is part of Cambridge 's Digital Library project that will eventually showcase other important scientific papers , including the works of Charles Darwin , Lord Kelvin and Ernest Rutherford . Part of Darwin 's personal library of hundreds of books -- many of them packed with the scientist 's notes in the margins -- is already online . You can view the Isaac Newton archive online at the Cambridge Digital Library .
Sir Isaac Newton 's manuscripts published online by Cambridge University Library . More than 4,000 pages -- a fraction of university 's Newton archive -- digitized so far . Experts say notes are `` some of the most papers and documents in the history of science '' Newton described law of gravity , developed calculus , studied properties of light .