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The chemistry of light and photography
     

The chemistry of light and photography

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by Hermann Wilhelm Vogel
 

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This is an OCR edition with typos.
Excerpt from book:
CHAPTER VE. LIGHT AS A CHEMICALLY-OPERATIVE AGENT. Theory of Photography—Nature of Light—Undnlatory Theory—Semi. Tones—Mouldering away of Bed Sulphuret of

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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free.
This is an OCR edition with typos.
Excerpt from book:
CHAPTER VE. LIGHT AS A CHEMICALLY-OPERATIVE AGENT. Theory of Photography—Nature of Light—Undnlatory Theory—Semi. Tones—Mouldering away of Bed Sulphuret of Arsenic—Chemical Decomposition by Light—Colours and Tones—Their Vibrations— Refraction—Dispersion of Colours—The Spectrum—Spectral-Lines— Invisible Hays — Photographs of Lunar-Landscapes — Abnormal Photographic Effect of Colours—Photography of the Invisible. Goethe says, "All theory is grey, and the golden- tree of life green." This saying has often been misunderstood and abused, especially by those too lazy to think; but, faithful to its true meaning, we have first treated of a multitude of facts from life—that is, from the history and practice of photography,—and now we proceed to describe, by the help of science, how and why, not the golden but the silver tree of photography becomes verdant, blooms and bears such splendid fruit. Two sciences join hand to accomplish the wonders of photography. One is Optics, a division of Physics, and the other Chemistry. We have already shown that they alone are inadequate to fulfil the requirements for the production of a photograph, .sthetical claims have to be considered ; and thus photography unites in itself the provinces of natural science and of the fine artswhich Bcein remote and incapable of union. We shall attend first to the optical principles—that is, to light— as the force which occasions the chemical changes in photography. We shall see that its chemical operations have not only become the basis of our art, but that they have played, and still play, a still more important part in the development of our planet. We are aware of the existence of sun, moon, and planets. We know their distance; nay more, we know their elements, though we are separated from them by mill...

Product Details

BN ID:
2940018224198
Publisher:
New York, Arno Press
Sold by:
Barnes & Noble
Format:
NOOK Book
File size:
442 KB

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