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The photographic news
- Bandzählung
- 29.1885
- Erscheinungsdatum
- 1885
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- Englisch
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- Hochschule für Grafik und Buchkunst Leipzig
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- Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 1402, July 17, 1885
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Zeitschrift
The photographic news
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Band
Band 29.1885
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- Register Index III
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Band 29.1885
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462 THE PHOTOGRAPHIC NEWS. [July 17, 1885. artist adopts a given expedient which is readily appreciable. Along the margins between the half-tones and the darker outlines of the engraved work, there is always interposed a zone of absolute white, representative of the play of light upon the illuminated edges of the design. Similarly, it wi’l always occur that, in the case of superposed portraits—and, a fortiori, in those in which the outlines are the more perfectly conformable—a broken zone of lighter tinge will skirt the outer shadows just where the “ points in common ” the most manifestly approximate. Here, then, we obtain a glimpse of the conditions under which this effect shall become the most markedly pro nounced in its degree. And, in this connection, it must be regarded as already experimentally ascertained that, in the instance of an individual who has reached maturity, the typical form of the face will thenceforward be maintained without manifest or appreciable departure.* ft is clear that under such circumstances the fiducial lines remain in unison, and there will arise no difficulties in effecting the absolute superimposition of the portrait;. Meantime, it may bo regarded as inevitable that in the interval between two or more sittings, the sitter has become more plump or more attenuated. Whichever event has happened, the superimposition will be attended with an identical issue. Interposed between the half-tones of the facial areas and the exterior marginal shadows, there will appear narrow belts of lighter tinge by which the coupled images will be different!ated. From this vantage ground, therefore, we betoken the assured attainment of a novel and artistic result in photo graphic portraiture. This it is for the ingenious to develop. More to the present purpose is the consideration that medical jurisprudence may find here the adjunct of a new and indubitable test of personal identification. Here, if anywhere, we may catch sight of “ that function which science asks of photography, and which medical juris prudence is entitled to ask of both.” Need it be added tint this presumed terra incognita has been already practically, if but partially, explored; and that it now awaits only that formal annexation to the ever-extending realms of science which, sooner or later, must inevitably take effect.—Yours, &c., War. Mathews. PHOTOGRAPHS ON PAPER. Silt,—Having been an ardent photographer for the past thirty years, and having, during that period, taken views in many countries by most of the known processes, I be came firmly convinced that for the purposes of travel, there is no substance that equals paper in the facilities it affords for obtaining pictures, and for general conveni ence. Glass, withallitsadvantages,hasthegreat drawbacks of being brittle, weighty, and the subject of exceeding anxiety during transport. I conse uently have, for a long time, endeavoured to overcome these obstacles, and find some mode whereby paper could be used in the place of glass, and this I think 1 have at last succeeded in doing. I would, in the first place, point out that, when you take a sheet of paper and coat it with the emulsion you would use for glass plate, the result is, on exposure, you get your picture on identically the same sensitive surface as you would if you used the glass plate for its support. The picture, we ail know, is on the gelitino- bromide film, and not either in the glass or the paper, and it can be readily washed off either, leaving both clear. The result is, you get your picture in the same way, and with the same exposure, on either support. Now, most people, when they examine a negative supported on paper, object to it for three reasons. First, because it is not so • In the conjointure of a photograph of Mr. Gladstone, of thirty years ante, with one of the present date, this effect is strikingly illlustrated. In such case, each portrait receives its due modicum of exposure. attractive to the eye as those seen on glass, and it is con demned as not being able to give a good print; and, secondly, because most paper negatives, when taken, are supported against a sheet of glass, which interposes between the film and the lens, and this causes a distur bance of the image, and results in want of sharpness of definition ; and, thirdly, it is objected that the prints can not be as good when light has to passthrough the support ing paper as though it were glass. Taking the last objection first, I can only say that it is quite fallacious, as a trial will show ; nay, there are times when it is a positive advantage to have paper instead of glass to print through. After many trials and failures, I overcame the second objection, thus. I took a thin sheet of ferrotype iron, or, by preference, of veneer, covered with glazed black linen (this latter substance I found on trial more convenient to manipulate), and attaching to the surface a sheet of gelatino-bromide paper, by means of Le Page’s fish glue (a most convenient article, and always ready for use, though gum will do as well), I placed the tablet so prepared in the dark slide, in the same way as I should a glass plate, and then exposed it for a picture, the result being that I got negatives giving pilots equal in every way to those obtained when a glass plate is used, and cannot be distinguished. We should always remember that the print is what we strive to obtain ; the negative is but the means to the end. To satisfy you on this point, I send you a print taken from a paper nega tive of my house, from which you can judge for yourself of the accuracy of my statement; and I would particularly call your attention to the sharpness of the definition of the fallen flowers of the rhododendrons on the lawn. I have, however, gone further ; I have devised a slide in which I can place a number (say, a dozen) of these tablets, and they being impervious to light, and being coated on each side with the gelatino-bromide paper, by simply being turned round you are enabled to tike two separate pic tures on each t iblet, and this I effect by drawing a bag made of light-proof material over this slide, and in which I am able to insert both hands with which to manipulate. When one tablet is exposed, all I have to do is to remove it to the rear of those superimposed on it, and repeat the operation till all are exhausted, thus obtaining twenty-four pictures, and the weight of the whole does not exceed that of an ordinary double slide of the same size with its pair of glass plates. J, B, HOLROYDE. Aroceedings of Sorieties. London’ and Provincial PIOTOGRAPHIC Association. The usual weekly meeting was held on Thursday last, the 9th inst., Mr. W. H. Prestwick occupying the chair. Mr. A. L. Henderson exhibited a photograph of some members of the Edinburgh Photographic Club taken by artificial light by Mr. S. Tamkins, the source of illumina tion being a mitrailleuse lamp and the gaselier ; a 3D lens; second largest stop, with an exposure of thirty-five seconds— it not being wished to tax the sitters beyond this. As was expected, the negative.proved very much under-exposed, but by a little dodging, a very fair print was obtained, a transparency being made by contact; the density in this caused by the gaselier was then reduced by rubbing with methylated spirit. It was then carefully adjusted with the glass side of the negative, and placed in the frame with the paper upon it; the paper, being fastened at two corners to the negative with gum paper, ad mitted of the transparency being slipped away when the high lights were a little printed up, and the printing was then com pleted. A question from the box was read :—“ What is known about the properties of pure iodide of silver, without bromide or chlo ride in dry plates ? ” Mr. J. B. Wellington had once made a pure iodide plate from accident by taking down the wrong bottle ; the plate would neither develop nor fix.
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