The photographic news

• Bandzählung: 6.1862
• Erscheinungsdatum: 1862
• Sprache: Englisch
• Signatur: F 135
• Vorlage: Hochschule für Grafik und Buchkunst Leipzig
• Digitalisat: Hochschule für Grafik und Buchkunst Leipzig
• Digitalisat: SLUB Dresden
• Rechtehinweis: Public Domain Mark 1.0
• URN: urn:nbn:de:bsz:14-db-id1780948042-186200003
• PURL: http://digital.slub-dresden.de/id1780948042-18620000
• OAI: oai:de:slub-dresden:db:id-1780948042-18620000
• Sammlungen: LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
• Sammlungen: Fotografie
• Bemerkung: Seite 1-72 fehlen in der Vorlage. Vorlagebedingter Textverlust.
• Strukturtyp: Band

• Digitalisat: SLUB Dresden
• Strukturtyp: Ausgabe

2,1861 — salt to> rains » inces. I the sod. develop indadd' mn, then! her. mo one a V ome bP is nec 1 from si ounce | ounces, i rely. I perfectly o thet ing sol’, soda. ' ition 1‘ in tweW w of, s ing so ove sil" d),to5 . preli same P had e hy. ATUP he edi‘ folio’ 1 eal de ’(1 now ovelsil) iral es?) ectim§ i so T’hei his de" mirrti , blaph playill/ ing re wil, r, a00 rms O’ % em2 stoKj >duc“j| ma grap) the ghts a mten’" Mat 2,1862.] THE PHOTOGRAPHIC NEWS. cotton the silvered paper and all left so for about Second process.—Silver the paper in the usual way with plain silver. When the paper is dry, or nearly so, expose it to the fumes of concentrated ammonia. In the experiments the ammonia was poured on some cotton placed at the bottom of a half-gallon wide-mouthed bottle. Above the : was hung, the bottle worked up, five minutes. After removal from Most of the awkwardness and unnaturalness of photographic portraits, come from these silly attempts of people to assist or improve nature : the human face never assumes a more ridiculous expression than when the mind is filled with vanity and affectation of beauty and smartness. Very few photographic portraits, indeed, are wholly free from this kind of blemish. Fortunately, the evil is diminishing, for people are getting used to sitting for their pictures, or more careless, or know better how to avoid awkwardness of ex pression.—Ed American Journal. the bottle the paper was exposed to a current of air till the odor of ammonia was removed. Remarks.—Comparative tests by the ordinary process were made by printing at the same time and from different parts of the same negative on pieces of paper prepared with plain silver. Thus, a peice of paper silvered with Plain paper, was cut in two, and one half exposed to the Anmonia fumes, and both were then printed and toned in he SAme manner. These tests showed plainly, that the Anmonia-nitrate paper was more sensitive, and was toned "ith greater facility. Probably, when ammonia-nitrate is used, the quantity of sAlting and of silver may be materially reduced. I believe that one or two grains of salt for the ounce of albumen, and A forty-grain strength of silver will be found to answer. I he paper I used was salted with ten to twenty grains, and thus acquired a strong silver solution. The alcohol to be used in the first process should itself be salted, if the salting of the albumen is weak. the above processes are founded on suggestions first published in this Journal. The use of alcohol was first recommended by the editor, and the ammonia fumes by Mr. Campbell ot Jersey City. Mr. Campbell’s article was published in July, 1858, and had in view only the plain paper. For ammoniating the paper a whole size daguerreo type coating box was recommended. In using the second process great care must be taken that theammoni a fumes do not reach the collodion room.— American Journal of Photography AMMONIA-NITRATE FOR ALBUMENISED PAPER. PIORoGRAPHIERS generally seem to be persuaded that there are peculiar virtues in the ammonia-nitrate of silver, for photographic printing. The use of ammonia-nitrate for plain paper has become universal, and now when the al- bumenised is rapidly superseding the plain paper, all are anxious that means may be devised for reinstating our favourite sensitizing solution. Most of the methods to accomplish this end, which have come partially into prac- tice, are the more or less objectionable and chiefly on the ground that the-so called ammonia-nitrate solutions contain little or no ammonia-nitrate at all. The two following Processes, however, employ the genuine and unadulterated article. first process.—Soak the salted albumenised paper in ninety-five per cent, alcohol, in order to coagulate the albumen, and then, after thoroughly drying the paper, silver with ammonia-nitrate by any of the known methods. I have tested the process in only a few experiments, and in these the ammonia-nitrate was ninety grains to the ounce, and the solution was poured on, and spread with a glass rod. Aroceedings of Societies. American PHOTOGRAPHIC Society. The regular meeting of the American Photographic Society was held at the New York University, April 14th, 1862. Vice- president Rutherford in the chair. After some minor business, and the election of six new members, the subject of hot-water development was called up by the Chairman. Col. Pike found it worked well with all dry plates. He seldom used more than 80° of heat, however. ’He found that very hot water blurred the lines of the negative.Four seconds was the longest exposure he gave his plates. He had used a sherry-coloured solution of caramel in place of tannin, and taken quite good instantaneous pictures by using a drop in the exposure. He avoided the use of a new collodion, as it had a hard surface, and was not so easily impressed in the camera as a film that is powdery when examined under a microscope. He considered collodion as unfit for use if less than 6 months old. He used a sample of waste collodion from a gallery where it had stood a year. The Chairman thought a neutral bath was not the best for tannin plates and hot water development. His had occasioned many failures. Mr. Thompson kept a very acid bath for tannin plates ex pressly, and found no trouble with it. Mr. Hull, by request, gave his formula for collodion Collodion. {Alcohol 4oz.95°. L Ether 4 oz. Dissolve it in 56 grs. gun cotton. lodizer. ’ Iodide Potass. Bromide Potass. Iodide Cadmium 36 grs. 12 grs. 12 grs. Water, enough to just dissolve. Add this solution to 4 oz. absolute alcohol. Mix above together, making in all 12 oz. of finished collodion, and add tincture of iodine till it is sherry-coloured. Instanta neous pictures of waves, vessels in motion, &c. &c., had been taken on tannin plates with the above collodion. He never poured his tannin solution over his washed plates, but always used a dip bath, using the same tannin over and over again. He did not recollect when the solution was made up. Mr. Thompson used six vertical baths; the first containing the silver bath; the second, third, fourth, and fifth, water; and the sixth, tannin solution. He placed his plates in each suc cessive bath, and found they were sufficiently washed before they reached the tannin bath. He usually prepared one dozen stereos per hour in this apparatus, and then changed the water, saving of course the silver by precipitating. Mr. Hull found that his savings in this way by computation paid for his pyrogallic acid. Dr. Leeds showed some prints on gallate of iron, and ex plained his process :— Immerse the paper eight minutes in bichromate of potass, saturated solution, and dry. Expose two and a-half minutes under the negative to bright sun-light. Wash in the dark room for half an hour. Immerse in solution of sulphate of iron, 1 oz. to 24 of water. Wash thoroughly, and immerse in saturated solution of gallic acid. Wash and dry. Mr. Campbell said the addition of gelatine to the bichro mate of potass, would preserve the whites, and add brilliancy to the prints. Professor Seely showed some samples of buff-coloured cotton from Central America, supposed to be a species of Nan keen cotton. He would make pyroxylins of some of it, and report. Ho also spoke of surgical photography. A patient without any nose was photographed to-day, and then a piece of flesh taken from his arm, and put into shape as a noso ; when healed, another picture will be taken, and the two exhibited to this Society. Mr. Rutherford called attention to the fact that Emerson’s Stereoscope, as manufactured by E. Anthony, entirely corrected all distortion in viewing geometrical figures, by closing or separating the lenses. He showed the effect on a picture of the moon, which could be made to seem concave, flat, or cor rectly round. Mr. Johnson exhibited some very beautiful experiments with various gas-burners, so arrayed as to have circular or other motions by the force of gas. By means of four revolving