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Sundials: Their Theory and Construction [Anglais] [Broché]

Albert E. Waugh

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Couverture | Copyright | Table des matières | Extrait | Index | Quatrième de couverture
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Amazon.com: 4.7 étoiles sur 5  23 commentaires
48 internautes sur 48 ont trouvé ce commentaire utile 
4.0 étoiles sur 5 Overall the best available sundial text. 19 mars 2002
Par Alex - Publié sur Amazon.com
Format:Broché
I have read and viewed the major English language texts on Sundials. These being 1.Waugh, 2. Mayall & Mayall, and 3. Rohr.
The Waugh text has good, mostly clear, intructions and gives both graphical and equation based methods of constructions. Mayall and Mayall perhaps has better graphical constuctions but Waugh excells in the variety of tables in the appendix. Waugh also has the clearest explanation of determining the declination of a wall. This is very important as many buildings are aligned along magnetic north (& south & east &west) rather than true north ( south etc...).
A shortcoming of the almost every book including Waugh, is the lack of clear instruction on how to draw other types of hours. Most importantly of these interesting alternatives types of hours are babylonian and Italian hours. These hours are still useful today. So far I've only found the Rohr text to have any attempt of explaining how to draw these lines. However the Rohr text simply doesn't match the clarity and breadth of Waugh and Mayall and Wayall.
Waugh (and Mayall and Mayall) both could do with an update on trigonometry. With the easy availability of scientific calculators, the need for log versions of equations and the use of things like "cot" functions is not needed and simply makes the calculations clumsy to perform on a key pad.
The book by Cousins is an excellent higly detailed text if you can get it, but it seems to be out of print. It is useful if you really want to get into the maths of spherical geometry and it wouldn't be the best book you'd want to read first. It makes you appreciate the wonderful elegance of the graphical solutions but it may convince you that it is all too hard when it actually isn't in a practical sense. Just about anyone can make a simple sundial.
The text by Rohr also has a good section on how to do hour lines on just about any shaped surface (bowl, sphere, plane etc..) if you have a rod for a gnomen. This is about the only strength of this text over the others.
So to conclude Waugh would be the best first text, very closely followed by Mayall and Mayall, then Rohr. The text by Cousins is excellent but at a much higher level that isn't needed for the construction for the standard types of dials.
28 internautes sur 28 ont trouvé ce commentaire utile 
5.0 étoiles sur 5 The all-time classic work on dialing. 25 juillet 1998
Par Un client - Publié sur Amazon.com
Format:Broché
Albert Waugh's "Sundials: Their Theory and Construction" is a veritable treasure-house of information on the ancient science of gnomonics. As a dedicated dialist of several years, I never could have achieved such wonderful results without Waugh's classic book. The work presents the art of building sundials from two perspectives: for the advanced dialist, Waugh's book approaches the theory from a highly complex, mathematical viewpoint, including some aspects of celestial mechanics; for the average "do-it-yourself-er", Waugh presents several projects that are simple and well-explained. Accompanying this fine work is a collection of solar tables, astronomical information, and various data of inestimable value that would alone justify the purchase price of the book. So whether your purpose is to further your technical interest in the fascinating science of gnomonics, or merely to build an attractive sundial for your garden over the weekend, "Sundial! s: Their Theory and Construction" should be in your collection. It is considered the very "bible" of dialmaking. I couldn't brag about it more had I written it myself!
24 internautes sur 24 ont trouvé ce commentaire utile 
5.0 étoiles sur 5 For the dial-builder 29 mars 2004
Par wiredweird - Publié sur Amazon.com
Format:Broché|Achat vérifié
No other book, as far as I know, gives such clear detail about making your own sundials. That word seems so narrow; Waugh covers much more of solar time-telling than just dials. One thing that amazes me is his passion. He writes with clear pride about his own sundials, good to within (he says) ten seconds!
This book covers graphical or analytic techniques for laying out sundials on just about any surface that doesn't move, horizontal, vertical (facing any direction), slanted, or even the ceiling. He also discusses the movable kind, like a "shepherd's dial". It has nothing inherently to do with sheep, but can be used anywhere, even without knowing true north.
The historian may be disappointed. This is not a catalogue of sundials through the ages, although bits of history are scattered throughout. In one sense, though, this is a view into the time of its writing (1973). A modern reader, with access to modern calculators and computers, will be amused if not puzzled by some of tricks used to make hand computation more feasible. I don't know anyone any more who multiplies by adding logs, and the circumlocutions around negative logarithms look positively quaint. The only real flaw in this book is its systematic omission of half the world: the southern hemispehere. It wouldn't have been so hard to add just a paragraph or two about sundials that work "backwards".
Although this book celebrates the craft and art that can go into a sundial, its real value is technical. This book gives the essential methods for the functional side of a solar time-piece; bring your own artistry.
14 internautes sur 14 ont trouvé ce commentaire utile 
4.0 étoiles sur 5 Sundials: Their theory and construction 7 avril 1998
Par Un client - Publié sur Amazon.com
Format:Broché
History of time-keeping by the sun, all types of sundial (including some you will never have seen before) also moondials. If you read this book, you will not rest until you have made your own sundial (I didn't)
10 internautes sur 11 ont trouvé ce commentaire utile 
4.0 étoiles sur 5 Definitely a classic... 7 janvier 2002
Par Dan Lamb - Publié sur Amazon.com
Format:Broché
I agree with the other reviewers...This is a very clear and concise treatment of the theory and practice of sundial construction. It is a very easy read, (anyone over the age of around 12-13 should have no difficulty with it at all,) and entertaining to boot! It has a few items that some of the other 'classics' on sundials do not. (Rene Rohr,s book "Sundials:History, Theory and Practice" and Mayall & Mayall's "Sundial's:Their Construction and Use".) The only thing this book really misses, (and the same holds true for virtually every book on sundials!) is the link between sundials telling time, and their potential use for navigation. Apart from that, this is a great book, and I highly recommend it.
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