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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. 500, April 3, 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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[April 3, 1868. THE PHOTOGRAPHIC NEWS. 186 LIVERPOOL AMATEUR PHOTOGRAPIIIC Association. The Ordinary Monthly Meeting of this Association was held on Tuesday evening, the 31st ult., the President, the Rev. G. Banner, in the chair. The minutes of the two previous meetings having been read. Mr. Green said he wished to call attention to one of the minutes ot the January meeting, referring to the picture pre sented to the Hon. Secretary, which had not been fully reported. The following is the inscription upon the picture, and will explain matters fully :“ This photograph, being the largest hitherto taken by the collodio-bromide process, is presented by the Liverpool Amateur Photographic Association to their Secre tary, Mr. W. Bolton, to whom photographers are mainly in debted for the discovery of the method of producing a photo graph without abath ; andin testimony of his zeal in promoting the objects of the Association.” Mr. Henderson was then called upon to read his paper entitled “ Photography as an Aid to the Study of Archaeology, (see p. 163) at the conclusion of which a number of very excel lent phototographs illustrating the paper were passed round, and also several volumes of photo-zincographic copies of old manu scripts, &c., including the Domesday Book for Lancashire and Cheshire. A vote of thanks having been accorded to Mr. Henderson, The Rev. T. Banner said, that the subject Mr. Henderson had chosen was one which might be enlarged upon to almost any extent. He quite agreed with Mr. Henderson astotha superiority of photographs over drawings. He himself had made a sketch of a Norman gateway, near Oxford, whico had occupied him two days, and which might have been very As above explained, collodion, after being silvered, remains for a variable time in a condition that it gives blue and transparent films, and then changes and gives creamy opaque ones. Now, whilst the latter condition is the best for the preparation of plates intended to be used dry, the former—the bluish condition—is absolutely essen tial for plates to be used wet. This distinction is one of no small importance, and, by attending to it, all danger of fogging with these self-developing plates is avoided. The best method of operating is to use the above-described collodion, adding to it 14} grains of nitrate of silver to the ounce. Shake long and well, and set aside for from one to four or five hours. The colder the temperature the longer will the collodion remain in the blue condition, and the longer time may be allowed for settling. Decant all but the bottom portion into a measuring-glass, and add to each fluid-ounce :— Alcoholic solution of gallic acid (60 grains to'the ounce) 10 minims Pure concentrated glycerine ... 10 drops If preferred to drop the gallic solution, 15 drops may be employed instead of 10 minims. As the glycerine is too thick to measure in a minim glass, it needs to be dropped. The gallic solution must be filtered perfectly clean. Stir up thoroughly with a glass-rod, remove all bubbles with a piece of paper, and collodionize the plate. From what has been said in the previous part of this paper, it is evident that the collodio-bromide mixture used for these plates must be fresh. In working with dry plates we may save the residue by adding a certain quantity of bromized collodion, enough to bring the alkaline bromide into large excess, and thus these portions may be set aside to be re-sensitized when wanted. But this cannot be done with the self-developing plates, because they must have sensitive collodion which has never passed into the creamy state. Collodion, therefore, for the self-developing plates must be mixed, shortly before it is wanted, of entirely fresh materials, and in a clean bottle. Such portions as may remain over must be rejected, whether or not the gallic acid has been added. I have been able further to improve upon this process by the agency mentioned already in connection with the regular dry process here described. I allude to effects produced by a lead salt. If a strong solution of acetate of lead in acetic acid be made, and 4 or 5 drops of this be added to the sensi tized collodion just before use, and immediately previous to the addition of the gallic acid as here described, a better plate is obtained than where gallic acid is used alone. It is more sensitive, gives a bolder picture, and does not seem more disposed to fog if the precaution be used of using the blue film. Although this process is a curious and interesting one, and quite novel, it is not to be compared, I think, with those described before it. The exposure is longer, and the films require more care to keep them on the plate. It is, however, certainly remarkable that a collodion film can be put into condition to go on slowly developing itself sponta neously, and yet show no disposition to fog. Concluding Remarks. It has been the object of the writer in making these researches to find a process, which whist giving thoroughly satisfactory results, should dispense with the complicated manipulations which render dry processes uninviting. He believes that the processes described in this third part will be found to have accomplished this result, especially that one in which a plate is simply collodionized, then as soon as set, plunged into the lead bath. It is believed that no one before has proposed to apply a sensitizer to a collodion plate containing pure nitrate of silver, without previous washing, and that it is here for the first time shown that this mode of operating gives a more sensitive plate with less work than the ordinary methods. By the mode of proceed ing here directed this sensitizing bath is not rendered 4roceedings nt Sucieties, Oldham Photographic Society. The Ordinary Meeting of the above Society was held on Thurs day, the 26th iust, the President, Mr. John Green, in the chair. After the minutes of the previous meeting had been read, Mr. James Hall was duly elected a member. Messrs. Wolstenholme then handed round a couple of nega tives, one being marked with small spots and streaks, the other being quite good, and all that could be expected. Messrs. Wolstenhulme stated that they were both from the same bath, taken immediately after one another, which caused a lengthy discussion. Messrs. Whitehead and Heaton then exhibited a tent made expressly for out-door work. Mr. Heaton stated that the tent he considered to be the most convenient one he ever used, and he had worked ia several. It was what he might call a modification of Leak’s, it being constructed for holding the bath, legs, and everything requisite, and could be placed under a railway seat when travelling. It was very much admired, and considered to be as perfect a tent as any photographer could wish. Mr. Heaton then read his paper on Out-door Photography. (This paper, owing to the pressure in our space, is unavoidably left over until our'next). A vote of thanks was passed to Mr. J. Schwape, of Rhodes, for some very beautiful prints for the portfolio; also to Mr. Heaton for his paper, which brought the meeting to a close. troubled or cloudy by the immersion of the washed plate, but remains perfectly clear. Of the various methods which he has described the writer is disposed to recommend this one, applying the modification of washing before using the lead bath, where a bright clean plate with clean glass in the deep shadows, and plenty of contrast is desired ; for general use, however, omitting the washing. By preparing one or two washed plates in each set. and making a W in the corner with a diamond, or even simply scratching a cross with a broken file, the operator will have plates suitable for all needs, the washed plates being reserved for wide views well illuminated throughout, and in which it is desirable to preserve and even to increase the contrasts which actually exist, whilst for all other uses the unwashed plates will have the preference.
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