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The photographic news
- Bandzählung
- 12.1868
- Erscheinungsdatum
- 1868
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- Englisch
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- F 135
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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. 531, November 6, 1868
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Zeitschrift
The photographic news
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Band
Band 12.1868
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- Titelblatt Titelblatt I
- Kapitel Preface III
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- Register The Index To Volume XII 619
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Band
Band 12.1868
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536 THE PHOTOGRAPHIC NEWS. [November 6, 1868. laid one upon the other in the dish until the whole number of negatives has been completed. I now proceed to intensify by means of two solutions pre pared as follows:— 1. Two ounces sulphate of iron dissolved in 3 pounds of water, and filtered. 2. Half an ounce of nitrate of silver dissolved in 20 ounces of water. The first plate is taken from the water bath, and if, on inspection, more density seems desirable, it is treated thus:— The negative is first rinsed in clean water and allowed to drain for ten or twelve seconds, and solution 1 is then poured on ; the liquid is allowed to flow equally over the plate, and when the latter has been sufficiently impreg nated with it, the negative is again drained. Solution 2 is now applied in such a manner that it is made to cover the surface quickly and evenly. The manner in which the iron solution acts upon the nitrate, changing the latter into metallic silver, and thus strengthening the image, may be easily observed during this operation. By proceeding in this manner the most successful effects may be obtained, as the operation is carried on in the light, and may be repeated as often as necessary, until the desired amount of density is obtained. The shadows remain very deep, the lights are brought out, and yet the picture does not become hard or possessed of too much contrast, as is often the case when pyrogallic acid is used for intensifying. To those who employ hyposulphite of soda as a fixing agent I would strongly recommend the placing of their negatives, after fixing, for some time in filtered rain or river water, as by this means the fixing material, and especially soda, is totally removed, whereby the film is guaranteed from splitting after it has been varnished; for it is well known that such plates are most liable to injury in this manner which have been insufficiently washed, from the fact that the trace of cyanide of potassium or hyposulphite of soda still attached to them is apt to absorb moisture from the atmosphere. Formerly I always used soda as my fixing agent; but I now use cyanide of potassium, the employment of which I certainly recommend to all photographers. Many gentle men would, no doubt, object to keeping plates for a whole day in water, for fear of the collodion film becoming separated ; but my experience goes to prove that only those films are liable to separation from the glass where the collo dion has been poured upon an insufficiently cleaned plate, or where the collodion used has a tendency to become acid. As a matter of course, care must be taken not to employ water for washing which is even slightly acid. Oorrespondente. A BUNDLE OF OLD LETTERS. Albuminized Paper and PRINTING—North and South LIeRT—Photography and Perspective. Sib,—Time flies apace. Here we are in November; only two months more, and then for another year!—then for the anxious watching for the lengthening of the days!—then again for the glorious work out of doors, over hills and dales, with the summer breezes flapping the tent-cover as a delicate intimation to gnats and other winged “ varmint ” that the operator is at work, and must not be disturbed, even if they are hungry! But, meantime, the winter—the long, dreary winter—has many a charm to the photographer. There are the glorious meetings of the societies, the reports of all that was said and done at them in the journals, and then, a week or two later, the clumsy cribs from more respectable papers by the little ones, who are as yet too small to have reporters of their own, or who are too fierce, or unfair, or untruthful, in their juvenile enthu siasm, to be allowed to send reporters to the meetings. All this is great fun to those who take a real, hearty interest in the profession. And then, too, inflnite good is done by the liberal discussion of various topics which are turned up from time to time, either in the papers or the meetings of the societies. I do not think that as a profession photography would get on well without the winter. It is a time of comparative rest; a time when one can sit down quietly at one’s own fireside, and think over the next year’s pictures; when the study of art can be continued with so much advantage from books ; when comparisons can so well be made between what the work of the year has been, and what it should have been. Winter should, in fact, be a time of repentance for all the sins and failings of the past, and also a time for making high resolves for the en suing season. Besides all this, however, winter is, above all, the time for recording the experience gained during the season which is past; and I hold it the duty of all who wish to promote the advancement of our art freely to tell, for the good of others, all the experience they have gained, and especially when their gains have been in a great measure the result ot the liberality of others. There is no photographer of position or ability in the art who would not thank even the humblest operator for a suggestion which might prove useful, and therefore none need fear, however small the amount of information they may have to communicate, for it is sure to be accepted with kindly feeling by all those whose acceptance is worth the having. It is only those ignorant snarlers who have never made a suggestion worth listening to who try to decry everything which does not emanate from their own little pens ; who, incapable of under standing topics of general interest, are bound to keep secret processes and improvements which they cannot explain; or who, having found a process in full and successful operation in the hands of others, hasten to relieve them of their burthen of credit, and to claim the invention as their own. But to turn to the matter on which it was my intention to write. Several letters have recently appeared in various papers, in which matters of which I have spoken or written have been referred to with various degrees of approbation or disapproba tion, generosity or ungenerosity, according to the character of the persons who wrote the letters. I will only refer to some of these. My first shall be the letter of Mr. Bovey in last week’s News. Mr. Bovey is a gentleman whose acquaintance I have not yet had any opportunity of making personally. I esteem him as one who has a decided opinion ot his own (and that, in these days, is a matter of great consideration), and as one who will put forward his opinion boldly and without fear. I was cer tainly not aware before last Friday that I held so high a place in the esteem of this honourable member of our profession, nor had I the faintest notion that in my paper before the North London Society, on November the 7th, I made such a complete shipwreck of my reputation in his eyes. A careful perusal of Mr. Bovey’s letter shows me, however, that I am not so far in the wrong as he would imply. In the first place, Mr. Bovey has mixed up in his mind my paper and the discussion which followed therefrom. I did not start the discussion, and, as far as I remember, I only took a very limited part in it. I said nothing about salting formula, nor do I wish ever to know anything at all about them. The question of formula cropped up in the discussion, not in my paper. I do not care a pin whether there are ten or twenty grains of salt in a sheet of paper, so that it works to my satisfaction. I did, however, in the dis cussion, admit that to know the equivalent quantity of salt in the paper would be a matter of convenience, as a means of knowing how much silver was used from the bath by each sheet. What I want in practice is, a paper that I can depend upon for a certain class of work, not only from one maker, but from all makers. As an instance of what I mean, take the following little bit of experience. When M. Adam-Salomon was in this country some time back, he paid us a visit at Tun bridge Wells, and Mr. Robinson secured a very fine “ Salomon sized” negative of him. To print from this negative in per fection we used a sample of Rive’s paper sent us by Mr. Bovey himself. The Saxe paper sent from the same quarter would not, with that particular negative, give us the same quality and richness of tone, and no other paper of any other maker which we have yet tried will give the same result absolutely. Now, if we take a negative much weaker than the one I have referred to, and another much stronger, and print them on the Rive’s paper I have mentioned, we shall not find the quality o
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