nigelisom,
unfortunately you cannot download the book, but you can sign up for Google books library and save the given book too. You can also scroll down to the pertinent chapter and you will find page 269 which begins flight in weather. If you scroll down fast, you will not be able to load the pages well, if at all, so scroll down slow.
Also if you google on scholar and google books, principles of flight, you will find many good selections, and the FAA provides many publications online for free. The pilot's handbook of aeronatutical knowledge link I gave you does work and it is also free to download each chapter.
John Tullamarine also has great suggested websites as does checkboard among others, please see these links via tech log.
http://www.pprune.org/tech-log/66205...eferences.html