Photography

Cover
J.J. Griffin and Company, 1853 - 329 Seiten

Im Buch

Inhalt

II
xiii
III
13
V
19
VI
35
VII
51
VIII
72
IX
100
X
104
XVIII
172
XIX
177
XX
183
XXI
185
XXII
193
XXIII
203
XXV
209
XXVII
216

XI
108
XII
113
XIII
115
XIV
124
XV
137
XVI
153
XVII
165
XXIX
235
XXX
257
XXXI
274
XXXIII
284
XXXV
295
XXXVII
299

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Beliebte Passagen

Seite xiii - An Inquiry concerning the Chemical Properties that have been attributed to Light.
Seite xiii - When the shadow of any figure is thrown upon the prepared surface, the part concealed by it remains white, and the other parts speedily become dark.
Seite 54 - ... the whole with water, a pretty strong blue impression is left, demonstrating the reduction of iron in that portion of the paper to the state of protoxide. The effect in question is not, it should be observed, peculiar to the ammor.io-citrate of iron.
Seite xiii - The images formed by means of a camera obscura have been found to be too faint to produce, in any moderate time, an effect upon the nitrate of silver.
Seite 19 - It is so natural to associate the idea of labour with great complexity and elaborate detail of execution, that one is more struck at seeing the thousand florets of an Agrostis depicted with all its capillary branchlets (and so accurately, that none of all this multitude shall want its little bivalve calyx, requiring to be examined through a lens), than one is by the picture of the large and simple leaf of an oak or a chestnut.
Seite 27 - Then dip it into a vessel of water, dry it lightly with blotting-paper, and finish drying it at a fire, which will not injure it even if held pretty near : or else it may be left to dry spontaneously. All this is best done in the evening by candlelight. The paper so far prepared the author calls iodized paper, because it has a uniform pale yellow coating of iodide of silver.
Seite xiii - Nothing but a method of preventing the unshaded parts of the delineations from being coloured by exposure to the day, is wanting to render this process as useful as it is elegant.
Seite 19 - But in truth the difficulty is in both cases the same. The one of these takes no more time to execute than the other ; for the object which would take the most skilful artist days or weeks of labour to trace or to copy, is effected by the boundless powers of natural chemistry in the space of a few seconds.
Seite 55 - Nor is it altogether impossible that the peculiar ' prepared ' state superficially assumed by iron under the influence of nitric acid, first noticed by Keir, and since made the subject of experiment by M. Schonbein and myself, may depend on a change superficially operated on the iron itself into a new metallic body isomeric with iron, unoxidable by nitric acid, and which may be considered as the radical of that peroxide which exists in the salts in question, and possibly also of an isomeric protoxide.
Seite 2 - LIVES OF THE BRITISH ADMIRALS AND NAVAL HISTORY OF GREAT BRITAIN, from the Days of Caesar to the Present Time. By Dr. JOHN CAMPBELL.

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