The photographic news

• Bandzählung: 11.1867
• Erscheinungsdatum: 1867
• 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-id1780948042-186700008
• PURL: http://digital.slub-dresden.de/id1780948042-18670000
• OAI: oai:de:slub-dresden:db:id-1780948042-18670000
• Sammlungen: LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
• Sammlungen: Fotografie
• Strukturtyp: Band

• Digitalisat: SLUB Dresden
• Strukturtyp: Ausgabe

12 THE PHOTOGRAPHIC NEWS. [January 4, 1867. W. L. Carpenter, B.A., in the Photographic and Chemical Sec tion, will be found the report of an interesting and valuable paper, by Dr. Herapath, F.R.S., on the new spring at Harro gate, described and analysed by Dr. Muspratt. As this water might possibly be found of value for photographic purposes, the attention of some of the scientific readers of the News is called to the circumstance.” A Portrait Taken Four Months After Decease.— Les Mondes says:—• Some time since,we published the details of a process, invented by Dr. Marini, for the preservation of any organic substance liable to rapid decomposition. On applying this preservative process to a corpse, it becomes perfectly rigid and stony, without, however, distorting in any way the countenance and features of the deceased. In this state the body will remain unaltered for a considerable period, and, if required, its former suppleness may be restored at any time. Wo have before us a photograph of a man taken four months after death, whose body had been preserved by Dr. Marini; the portrait is that of Pietro Martini, author of a history of Sardinia, who died on the 17th of February last. On the 17th June following, the body was disinterred and carried to a terrace adjoining the cemetry, where, having been restored to its original supple condition, and appropriately clothed and posed, it was photographed by M. Augustin Lay in the presence of many of the deceased’s friends. The result was very successful, and the picture obtained had the appearance of having been produced from a Jiving model.” Ul Correspondents, #,* Our New Volume.—The present number commences a new volume of the Photographic News, and, in accordance with our custom, we here take occasion to write one or two words on our arrangements for the coming year. These chiefly consist in maintaining in the fullest efficiency possible the existing features of the journal, which have already found favour with our readers, and adding such others of value as circumstances may render desirable or necessary. We intend to continue in the future, as wo have aimed in the past, to give especial prominence to information of a practical character, tending to promote the progress of photography as an art, a science, and a branch of trade, and which shall promote the interests of all connected therewith. Amongst the contributors from whom we have reason to hope for regular or occasional communications, wo may mention Mr. II. P. Robinson, Mr. Jabez Hughes, Mr. W. Crookes, F.R.S., Mr. J. Spiller, F.C.S.; Mr. V. Blanchard, Mr. Samuel Fry, Mr. T. R. Williams, Mr. J. W. Swan, Mr. W. England, Mr. Francis Bedford, Mr. Claudet, Mr. Nelson K. Cherrill, Mr. W. Mayland, Mr. A. Keene, Dr. Anthony, Mr. 0. G. Rejlander, Dr. Hermann Vogel, M. Ernest Lacan, “The Photographer’s Assistant,” “The Old Photographer,” Mr. Charles Waldack, Mr. J. Carbutt, Mr. Notman, Dr. Liese- gang, Mr. H. Baden Pritchard, Mr. Alfred Hughes, Mr. Werge, Mr. W. Woodbury, Dr. Phipson, and many others, whoso contributions will, we trust, render the Photographic News as acceptable in the future as it has been in the past. *,* The Year-Book of Photography for 1867 is now ready, price One Shilling; by post, Ono Shilling and Twopence. Besides the calendar, information on Societies, and a complete epitome of the practice of photography, in its most improved form—as recognized by the best authorities—the Y ear-Book for 1867 contains a largo number of original articles on important subjects, by the ablest and most distinguished photographers. Amongst others we may mention the names of T. R. Williams, Dr. Anthony, Mr. Mudd, Mr. H. P. Robin son, Mr. Jabez Hughes, Mr. England, Mr. V. Blanchard, Mr. Walter Woodbury, Mr. 0. G. Rejlander, Mr. J. H. Dallmeyer, “The Old Photographer,” Mr. J. Spiller, Mr. Samuel Fry, Mr. J. W. Swan, Mr. Nelson K. Cherrill, Mr. H. Butter, Mr. A. Keene, Mr. W. Crookes, Mr. H. Cooper, jun., Mr. F. W. Window, and other gentlemen. Epitomized accounts of new and modified processes, patents, tables, &c., also appear, the volume constituting an exceedingly full and complete compendium of the present state and practice of photography, as stated by its ablest representatiyes. J. II. R.—Some difference of opinion prevails as to the effect of light upon the collodio-albumen plate in its earlier stages. The result seems to depend very much upon the kind of collodion employed. If it contain the bromide, it has been found that the treatment with an iodide does not render it totally insensitive to light, and plates presumed to be insensi tive have been found to be injured by exposure to light whilst in that state. It is probable that if a simply iodized collodion were employed, all the earlier stages of preparation might be conducted in daylight, the final sensitizing alone being effected in the dark room. 2. Collodio-albu men plates may be developed by the alkaline method, but there is frequent risk of stains and fog. An important condition in such case is the very perfect final washing, so as to remove all trace of free nitrate of silver. Plain pyro and, if necessary, heat are, in our experience, preferable to alkaline development for bringing out the image with short exposure in collodio-albumen plates. G. Redaway.—We do not know of any we can especially recommend. J. F. S.—We do not know the present address of Mr. Victor Prout. Possibly some of our readers can inform you. INQUIRENS.—The form of splitting of negatives to which you refer, in which the film is honeycombed with vein-like blisters, is not uncommon. Its proximate cause is generally damp ; but the action of damp in producing this defect is originally caused by traces of the fixing salt remaining in or under the film not having been perfectly removed by washing when the negative was produced ; or it may be that the washing water contained salts of some kind. In either case, the presence of hygroscopic salts in f or under the film is the cause of moisture being absorbed, and the veins < in question rising. The mode of dealing with the negative so as to restore it has been fully described in our columns by Mr. Spiller. (See p. 378, Photographic News, Vol. VIIL) The hardest and, we believe, the best varnish we have tried is Newman’s Diamond Varnish. It is impossible to scratch it with the nail in the manner you describe. J. S.— We cannot tell you the best market in which to buy isinglass. 2. The blackening of stops is generally effected by means of a solution of bichloride of platinum, containing a trace of nitrate of silver. The metal should be quite clean, and the solution applied with a camel’s-hair brush, the whole being washed when the operation is completed. It would probably be well to polish off the whole of the black first, and then recoat the whole. A solution, prepared by dissolving old Daguerreo type plates in dilute nitric acid, is used by some, in which case the metal should be heated before the solution is applied. 3. The inside of cameras is generally blackened with a mixture of lampblack and common size applied warm ; or, better still, a mixture of lampblack and shellac in methylated spirit or wood naptha applied cold. An Enquirer.—Bleached shellac is frequently very insoluble, and, as it con- 1 tains chlorine, it should not be employed in varnish for photographic pur- Al poses. The varnish you have made is, however, manifestly too thick ; that would cause it to reduce the negative somewhat. As a general i rule, the thinner the varnish the less it will reduce the intensity of a negative. But, from your description of the effect produced at the point where the varnish is poured on, it would appear that a slightly solvent action is produced, which may be due to the spirit being too strong, and the collodion of that character which dissolves in strong alcohol. A drop or two of water to each ounce would cure this. It will turn the varnish ‘ turbid at first, but it will gradually clear again. 2. Spirit of 05 per cent, is very strong, and contains 05 parts of absolute alcohol and 5 parts of water in 100. Your spirit at 54 over-proof should not be too strong, as it contains a much smaller percentage of absolute alcohol than that named. 3. In the formula you name, the proportion of chloride of limo j is unnecessarily large. It will not all be dissolved, but a portion of the hydrate of lime left behind will be removed by filtration. There will still be excess of chlorine present, but, as very hot water is to be used, the chlorine will be driven off. 4. All washing pans arc better for having a perforated bottom, which prevents the prints coming into con tact with the lowest stratum of water, which will be that containing the most water. If the prints were so arranged as to cover the bottom care fully, and did not float, all the water having to pass through the prints would, of course, aid the washing and removal of hypo. II. C.—The cause of your print looking dull is the imperfection of the negative from which it is taken. The negative is not quite sharp, the figure is lighted too directly with front top light, and it is under-exposed. One of the chief faults you have to avoid is under-exposure. With I proper attention to this point, a removal of excess of front-light, and use I of more side-light, you will get rid of the flatness of your prints, and secure more modelling. New Zealander.—Received, and shall have attention. The amount pays the subscription to the eighteenth week in next year. Some Reviews and several Articles in type are compelled, from the pressure on our space, to stand over until our next. Several Correspondents in our next. Photograpbs Rkegistered. Mr. Edward Tnos. Brooks, Newbury, Berks, Photograph of Group of upwards of Eight Hundred Persons. Mr. J. Losn, Dalston, Carlisle, Photograph of Rev. J. Veysey. Messrs. Brown and Wheeler, Cowes, Photograph of Leonard W. Jerome, Esq., and M. Knapp, Esq., Photograph of W. II. McVicar, Esq. Photograph of Col. Stuart M. Taylor. Photograph of View of the three Americans Messrs. Appleton and Co., Photograph of Group of forty Ministers and Laymen of the Wesleyan Methodists. *,* All photographs forwarded to the Publisher for registration receive attention at once ; but the pressure on our space sometimes compels y to defer the acknowledgment In this column. It should be bornad mind, therefore, that non-acknowledgment at once doos not necessari) imply noh-xeceipt or non-registration.