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The photographic news
- Bandzählung
- 5.1861
- Erscheinungsdatum
- 1861
- Sprache
- Englisch
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- F 135
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- Hochschule für Grafik und Buchkunst Leipzig
- Digitalisat
- Hochschule für Grafik und Buchkunst Leipzig
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- SLUB Dresden
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- Public Domain Mark 1.0
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- Bandzählung
- No. 151, July 26, 1861
- Digitalisat
- SLUB Dresden
- Strukturtyp
- Ausgabe
- Parlamentsperiode
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- Wahlperiode
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Zeitschrift
The photographic news
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Band
Band 5.1861
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- Titelblatt Titelblatt I
- Sonstiges Preface III
- Ausgabe Ausgabe 1
- Ausgabe Ausgabe 13
- Ausgabe Ausgabe 25
- Ausgabe Ausgabe 37
- Ausgabe Ausgabe 49
- Ausgabe Ausgabe 61
- Ausgabe Ausgabe 73
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- Ausgabe Ausgabe 97
- Ausgabe Ausgabe 109
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- Ausgabe Ausgabe 145
- Ausgabe Ausgabe 157
- Ausgabe Ausgabe 169
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- Ausgabe Ausgabe 205
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- Ausgabe Ausgabe 287
- Ausgabe Ausgabe 299
- Ausgabe Ausgabe 311
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- Ausgabe Ausgabe 347
- Ausgabe Ausgabe 359
- Ausgabe Ausgabe 371
- Ausgabe Ausgabe 383
- Ausgabe Ausgabe 395
- Ausgabe Ausgabe 407
- Ausgabe Ausgabe 419
- Ausgabe Ausgabe 431
- Ausgabe Ausgabe 443
- Ausgabe Ausgabe 455
- Ausgabe Ausgabe 467
- Ausgabe Ausgabe 479
- Ausgabe Ausgabe 491
- Ausgabe Ausgabe 503
- Ausgabe Ausgabe 515
- Ausgabe Ausgabe 527
- Ausgabe Ausgabe 539
- Ausgabe Ausgabe 551
- Ausgabe Ausgabe 563
- Ausgabe Ausgabe 575
- Ausgabe Ausgabe 587
- Ausgabe Ausgabe 599
- Ausgabe Ausgabe 611
- Register Index 619
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Band
Band 5.1861
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- Titel
- The photographic news
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poured id then ap ham tannin plates. Mr. Sisson says :— “ I used Ponting’s collodion, ordinary nitrate of silver bath, washed the plates in two or three baths of water, poured over carefully a small quantity of the liquid, and then raised up to dry in a warm room, just as in any other dry six grains of picked gum arabic, from two to three grains of bi-borate of soda, and ain. lb 6 is t of ins iger mo- lore the ans- lure filer •rite phic are they me the iffed e a mat lire- and you We ead. । not ose. ead- edly less j no o on have nore very asily rould k of once, eared ' you very ! pro- imen The p the r the g the fed to h we ie left finger r this would hould e are which twenty minims of alcohol to each ounce of water. We sensitized several stereo plates, in some of which a bromo-iodized collodion was used, and in others a simply iodized sodium collodion. On removal from the ordinary nitrate bath each plate was placed in a dish of distilled water, and remained there until another plate was prepared, when it was transferred to another dish of common water, and after remaining there until another plate was coated, was finally carefully washed with about a pint of common water poured from a jug. Sufficient of the preservative was now poured over the plate at one end, and suffered to flow off at the other; and then a second portion was poured on at that end, and after flowing over the plate, drained off at MODES OF FIXING NEGATIVES. Since the practice of using iron development for negatives has become general, especially amongst portraitists, whilst a higher class of pictures, softer, rounder, and more delicate has been produced, we have not unfrequently heard com plaints of some little difficulty in obtaining sufficient bril liancy and vigour. As, under these circumstances, every minor addition to the printing value of a negative is of import- ay be ral •er ies m- id. ng be is sed ses ath OP ng, dis- eat* you ice, fa rith an oas are are less ,all THE PHOTOGRAPHIC NEWS. Vol. V. No. 151.—July 26, 1861. the opposite end. The plates were then reared up against the side of a large jug containing hot water and dried. The plates were exposed within a few days, some in a moderate diffused light, others in weak sunshine for various periods from two seconds to ten; using a Dallmeyer’s stereoscopic lens and three-eighths stop. Some were developed with a solution, containing fifteen grains of iron, and fifteen minims of acetic acid to an ounce of water, to which three or four drops of a twenty-grain silver solution were added ; and others with a two-grain solution of pyrogallic acid. The results varied, the best negatives being those prepared with the simply iodized collodion, and developed with iron; a five seconds’ exposure in a weak sunlight giving an excel lent negative. Another plate, which received ten seconds’ exposure in diffused light, developed with pyro gallic acid, yielded a similar picture. The negatives were clean, crisp, and vigorous, black in tone, and in all respects satis factory. So far the results were highly satisfactory and promising ; but we are bound to add that in several other experiments we were not so entirely successful. Unless the utmost care was used in washing away all the free silver, a tendency to a red fogging was present, which we have noticed on other occasions in plates prepared with gum. In all cases, how ever, the results were superior in rapidity to most other dry processes, and very little inferior in sensitiveness to wet col lodion. The development is almost as rapid as that of a wet plate, and we noticed no tendency to blisters, or danger of losing the film. The reports of the gentlemen who have tried plates pre pared with this preservative vary; but as in all the tendency to fog or stain in developing, unless great care had been THE REV. J. LAWSON SISSON’S RAPID DRY PROCESS. Some weeks ago we announced to our readers that the par ticulars of an extremely rapid dry process had been com municated to us by the Rev. J. Lawson Sisson, and that the only condition attached to the publication of all details was that we should first try it thoroughly ourselves. We have done so, with varying success as to results, but always with considerable rapidity as regards exposure. It has also been tried by several of our friends : the results we shall state in due course. Before proceeding further we will give the details of the process, and for exactness we will first state them in Mr. Sisson's own words. The manipulations in this process are very similar to those recommended for the preparation of process.” The preservative solution is made as follows :— “If you take one ounce of ordinary gum arabic and dis solve it in one ounce of water by gentle heat, and then by degrees add one ounce of water to it in which has been dissolved some common borax, biborate of soda, you. will have a most remarkable mass, twice as large and twice as stiff as the first solution. This is, or ought to be a well- known fact. Now keep adding water in which has been dissolved as much borax as it will take up (it dissolves a very very small quantity) until the liquid is almost as thin as water ; then add a small quantity of spirits of wine to the solution, which will no longer precipitate the gum as before, but absolutely rather thicken the solution, as careful experi ment will show you.” The development Mr. Sisson states may be effected either with pyrogallic acid and silver, or iron and silver, the latter giving the most rapid results. The general characteristics of the negatives obtained by Mr. Sisson were, as regard softness and delicacy, as nearly as possible similar to those obtained by wet collodion. The tone is very fine for transparencies, being of a rich warm brown black not requiring any toning. The plates have in Mr. Sisson’s hands kept for months without deterioration, and the preservative solution was perfectly good at the end of twelve months. All the prints we have seen from Mr. Sisson’s, vouch for the excellent character of the negatives. In following out the above instructions for preparing the preservative for our own experiments, we made a solution which contained, when completed, solution, and the utmost possible care in washing before ing it. We shall be glad to learn the results in the i of any of our readers. used in preparing the plates to get rid of free nitrate, it is quite possible that the cause might be found in some pecu liarity of the solution used, which was in all cases from the same bottle as that from which we ourselves found similar results. Some of our friends state that they found the plates not more rapid than those prepared by the Fothergill process, whilst others found less than half the exposure sufficient. It was our intention to [have submitted the process to further experiment before publication; but an unusual pressure of duties has prevented us, and as the season is rapidly advancing, we think it desirable that our experi mental readers should have an opportunity of trying it before the summer is passed. In our hands it has justified our hopes of rapidity, and in the hands of the inventor, the Rev. J. Lawson Lisson, it appears to have yielded results of the utmost uniformity, both in rapidity and in the high quality of the pictures produced. To those of our readers, who may be anxious to try the process, we should recom mend a little less gum and a little more borax in the
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