The Dictionary of Photography for Amateur and Professional Photographers

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Hazell, Watson & Viney, ld., 1902 - Photography - 656 pages
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Page 28 - C. It is almost insoluble in water, but soluble in all proportions in alcohol and ether.
Page 360 - This impression of the images is made the first instant they are received on the canvas, which is immediately carried away into some dark place ; an hour after, the...
Page 27 - If, then, the process has been successful, a perfectly black positive picture Is at once developed. At first it most commonly happens that the whole picture is sooty or dingy to such a degree that it is condemned as spoiled, but on keeping it between the leaves of a book, especially in a moist atmosphere, by extremely slow degrees this dinginess disappears, and the picture disengages itself with continually increasing sharpness and clearness, and acquires the exact effect of a copperplate engraving...
Page 486 - 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.
Page 26 - ... air bubbles), and allowed to remain till the picture (if anywhere visible) is entirely destroyed, or if faded, till it is judged sufficient from previous experience ; a term which is often marked by the appearance of a feeble positive picture, of a bright yellow hue, on the pale yellow ground of the paper.
Page 26 - Paper proper for producing an amphitype picture may be prepared either with the ferrotartrate or the ferro-citrate of the protoxide or the peroxide of mercury, or of the protoxide of lead, by using creams of these salts, or by successive applications of the nitrates of the respective oxides, singly or in mixture, to the paper, alternating with solutions of the ammonio-tartrate or ammonio-citrate of iron, the latter solution being last applied, and in more or less excess.
Page 600 - The first table gives percentage solutions ; the second gives parts in 1,ooo or less. The use of the first is as follows : Run down column one until the correct percentage wanted is found, then move to the right along the line until the column is found, giving the amount of fluid measure to be made up ; at the intersection will be found the weight of salt required. It must be remembered...
Page 271 - How would you prove that the illumination on any surface is inversely as the square of its distance from the source of light ? 6.
Page 334 - To find x divide the square of / by 16 times the square of o (the diameter of aperture to lens). For example Focus an object which is five inches high, so that it is one inch high on the ground glass; thus we know that r = 5. Next measure the distance between the object and the ground glass (F+f), which is found to be 45 Inches.
Page 26 - ... a superb velvety brown. This extreme richness of effect is not produced except lead be present, either in the ingredients used, or in the paper itself. It is not, as I originally supposed, due to the presence of free tartaric acid. The pictures in this state are not permanent. They fade in the dark, though with very different degrees of rapidity, some (especially if free tartaric or citric acid be present) in a few days, while others remain for weeks unimpaired, and require whole years for their...

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