A Manual of PhotographyJ.J. Griffin and Company, 1852 - 321 Seiten Pt. I. History of discoveries in photography -- pt. II. Scientific investigations on photography -- pt. III. Practice of photography. |
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achromatic achromatic lens actinic action of light albumen alcohol ammonia apparatus appear applied barytes bath beautiful blue bromine Calotype camera obscura chemical chloride cloth coating collodion Collodion Processes colour copper copy cotton Crown 8vo Daguerre daguerreotype daguerreotype plate dark darkened dissolved distilled water drachms dried effect employed Encyclopædia Engravings experiments exposed exposure fixed fluid fluid ounce formed frame gallic acid gold grains heat hydriodic hyposulphite of soda impression inches influence iodide of potassium iodide of silver iodine iron lens lenses liquid mercurial vapour mercury metal minutes muriate negative Niepce nitrate of silver nitric acid object obtained operation ounce of water oxide photographic paper picture placed polished potash potassium precipitate prepared produced quantity radiations rays remarkable removed rendered sensibility sensitive sheet Sir John Herschel solar solution of nitrate spectrum sufficient sunshine surface Talbot tint violet washed yellow
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Seite 17 - 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. But in truth the difficulty is in both cases the same. The one of these...
Seite 6 - 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 6 - 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 25 - 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 7 - 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 82 - Calotype, which it quite equals, by simply washing it over with a solution formed of one drachm of the ferro-cyanate of potash to an ounce of water. These papers may be washed with the ferro-cyanate, and dried in the dark ; in this dry state they are absolutely insensible, but they may at any moment be rendered sensitive by merely washing them with a little cold water. The paper is rendered quite insensible by being washed over with the above hydriodic solution, and from the photograph thus fixed...
Seite 5 - OF RELIGIOUS DENOMINATIONS. An Authentic Account of the various Religions prevailing throughout the World, written by Members of the respective Bodies. Second edition, crown 8vo, 5s. cloth. ROME— HISTORY OF. HISTORY OF ROME, from the Foundation of the City of Rome to the Extinction of the Western Empire.
Seite 57 - ... of the kind exists is due to the effect of casual dispersed light incident in the preparation of the paper. I have before me a specimen of paper so treated in which the effect of thirty seconds' exposure to sunshine was quite invisible at first, and which is now of so intense a purple as may well be called black, while the unsunned portion has acquired comparatively but a very slight brown. And {which is not a little remarkable, and indicates that in the time of exposure mentioned the maximum...
Seite 63 - This is also the place to observe that the colour of a flower is by no means always, or usually, that which its expressed juice imparts to white paper. In many cases the tints so imparted have no resemblance to the original hue. Thus, to give only a few instances, the red damask rose of that intense variety of...