OR, System of Universal Knowledge : ON A METHODICAL PLAN PROJECTED BY SAMUEL TAYLOR COLERIDGE. THIRD EDITION, ENLARGED. Second Division. Applied Sciences. PHOTOGRAPHY. LONDON: PUBLISHED BY JOHN JOSEPH GRIFFIN AND CO. 53, BAKER STREET, PORTMAN SQUARE; AND RICHARD GRIFFIN & CO. GLASGOW. 1853. PHOTOGRAPHY. BY ROBERT HUNT, PROFESSOR OF MECHANICAL SCIENCE, &c., IN THE MUSEUM OF PRACTICAL GEOLOGY; AUTHOR OF RESEARCHES ON LIGHT," THE POETRY OF SCIENCE," ETC. PREFACE. THE rapidity with which the second edition of this work has been exhausted, is a most satisfactory proof that a collection within convenient compass of all the facts connected with the progress and practice of Photography, was required by the increasing number of amateurs and artists who are interested in its very beautiful phenomena. In the present edition a new system of arrangement has been adopted, which will, it is thought, prove generally convenient. The first division contains the history of the progress of Photographic discovery, in which the greatest care has been taken to ensure exactness, and to give to each discoverer the full merit of his labours: the date of publication being taken in all cases where it could possibly be obtained. The second division embraces the science of the art; and it is a section to which the attention of the intelligent student in Photography is particularly directed, as he may, by the knowledge he will thus acquire, relieve himself from many of the annoyances attendant upon frequent failures, and probably advance himself in the path of new discovery. The manipulatory details, given with all necessary minuteness, are included in the third division. A very large portion of the present volume consists of new matter the Waxed Paper and the Collodion Processes, amongst other, sections, may be referred to; and the appended chapter, |