A Manual of PhotographyR. Griffin, 1854 - 361 Seiten |
Inhalt
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Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
achromatic lenses actinic albumen alcohol ammonia apparatus appears applied bath beautiful blue bromine calotype camera obscura chemical chloride clean cloth lettered coating collodion collodion process colour copied copper cotton daguerreotype daguerreotype plate dark darkened dissolved distilled water drachms dried effect employed engraving experiments exposed exposure film fixed fluid fluid ounce focus frame gallic acid glass plates grains heat hyposulphite of soda immersion impression inches iodide of potassium iodide of silver iodine iodized iron lens liquid mercurial vapour mercury metallic minutes muriatic negative nitrate of silver nitric acid object obtained operation ounce of water oxide photographic paper picture piece placed positive potash precipitate prepared produced quantity rack and pinion rays refraction removed rendered saturated solution sensibility sensitive sheet Sir John Herschel soaked solar solution of nitrate spectrum sufficient sunshine surface Talbot tint tion violet washed yellow
Beliebte Passagen
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 26 - Dry the paper cautiously at a distant fire, or else let it dry spontaneously in a dark room. When dry, or nearly so, dip it into a solution of iodide of potassium, containing 500 grains of that salt dissolved in one pint of water, and let it stay two or three minutes in this solution.
Seite 6 - White paper, or white leather, moistened with solution of nitrate of silver, undergoes no change when kept in a dark place, but, on being exposed to the daylight, it speedily changes colour, and after passing through different shades of grey and brown, becomes at length nearly black. The alterations of colour take place more speedily in proportion as the light is more intense. In the direct...
Seite 7 - 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 18 - 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 64 - ... commenced, goes on rapidly. It does not even cease in the dark when once begun. Hence it happens that photographic impressions taken on such paper, which, when fresh, are very sharp and beautiful, fade by keeping, visibly from day to day, however carefully preserved from light.
Seite 19 - I have succeeded in increasing its sensibility to the degree that is requisite for receiving the images of the camera obscura. In conducting this operation it will be found that the results are sometimes more and sometimes less satisfactory in consequence of small and accidental variations in the proportions employed. It happens sometimes that the chloride of silver is disposed to darken of itself, without any exposure to light: this shews that the attempt to give it sensibility has been carried...
Seite 6 - An Account of a Method of Copying Paintings upon Glass, and of making Profiles by the Agency of Light upon Nitrate of Silver; with Observations by H. Davy.
Seite 304 - ... is that which assumes that an object is seen single because its pictures fall on corresponding points of the two retinae, that is on points which are similarly situated with respect to the two centres both in distance and position. This theory supposes that the pictures projected on the retinae are exactly similar to each other, corresponding points of the two pictures falling on corresponding points of the two retinae.
Seite 157 - Thermography promises to develope some of those secret influences which operate in the mysterious arrangements of the atomic constituents of matter; to show us the road into the yet hidden recesses of nature's works, and enable us to pierce the mists which at present envelope some of the most striking phenomena, which the penetration and industry of a few " chosen minds," have brought before our obscured visions.