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The photographic news
- Bandzählung
- 13.1869
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- 1869
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- Englisch
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- Hochschule für Grafik und Buchkunst Leipzig
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- Hochschule für Grafik und Buchkunst Leipzig
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- Heft 545 (S. 73-84), Heft 547 (S. 97-108), Heft 589 (S. 599-610) fehlen in der Vorlage. Paginierfehler: Auf Seite 444 folgt Seite 443
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- Bandzählung
- No. 539, January 1, 1869
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Zeitschrift
The photographic news
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Band 13.1869
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- Register Index To Volume XIII 629
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Band 13.1869
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12 THE PHOTOGRAPHIC NEWS. [January 1, 1869. Light.—It is quite possible to get a sample of glass which will ad mit a large quantity of non-actinic light, and exclude such rays as will act on the sensitive plate; but it requires a little care in the selection. Some samples of glass which appear to the eye suffi ciently of a non-actinic character are really worthless.’ Some samples, for instance, appear to possess a deep yellow tint, but are really of a light brown colour, through which actinic light can pass tolerably freely. The best kind of glass is that the yellow tint of which is produced with oxide of silver. There are two modes of selecting glass with certainty : one consists in examining it through a spectroscope, and ascertaining that it cuts off all the actinic rays; or actually testing it with a sensitive plate. You can add to the non-actinic character of the glass you already have in your window, either by coating it with one of the non-actinic varnishes of which we have before published formulae ; or you can apply the non-actinic collodion described by Mr. Wergo in our Year-Book just out. P. Edwards.—There are various methods of producing enlargements on canvas ready for painting; unfortunately, they would occupy too much space for repetition in this column. You will find two or three methods described in our last volume: there is one on page 179, and one on page 272. The most suitable enlarging appa ratus for the purpose is a solar camera. For printing on ivory we have also published several formula) in back volumes. Perhaps there is no method more simple or satisfactory than the collodio- chloride process. Its mode of application is described in cur last Volume, page 302, and also in our Year-Book just out. Amateur.—The "D ” lens is more rapid than the rapid rectilinear; but the latter should be chosen for views, &c. The latter requires about twice the exposure of the former. Both lenses are double combinations, but the latter consists of two cemented compounds, and in the former the back lens is uncemented. R. D. Ewing.—Wo will give your desire our best attention. We hope to write shortly. W. J. A. G.—We are glad to learn that we have been of so much service to you. Although we undertake to help our readers out of difficulties as a duty, that duty becomes a pleasure when we are informed that our aid has been efficient. The markings you men tion as occurring only with a certain lens and camera are singular. Flare generally arises from an image of the stop, or of the light coming through the stop, and is a round spot; the edges, from being out of focus, graduated off. The mark on the plate you sent was not round, but of an irregular shape, and its appearance sug gested that it was a stain, due either to the preparation or develop ment of the plate. If you are satisfied that the marking is not of a chemical nature, but is due to the lens or camera, examine both, and see if light is admitted in any way. Examine the image carefully on the ground glass, and note if a portion of the imago upon the glass is lighter than the rest, and if that portion corre sponds in shape with the marking on the plate, you may be sure it is due to optical causes, and not to a chemical defect. When flare is present in a single lens, it may be duo to defective mount ing, some portion of which reflects light on the plate ; or it may bo due to the stop being placed too much in advance of the lens. 2. You will find some further information on the gum process in the present number, and also in the new Year-Book. . Bees'- wax dissolved in benzole forms a good edging for plates. .We do not sec, however, any reason why spirit varnish should injure the film beyond the space whereon it is applied. The burnt sienna should be carefully ground up with a little size or gum-water to make it suitable for applying to the back of the plate.. You will find a good hint for backing plates in Mr. Werge's article in the Year-Book just out. Thanks for your good wishes. GERMANICUS (Bangalore).—Your former letter and enclosures were duly acknowledged in the News at the time they were recieved. We then promised to return to your interesting letter, intending to give some extracts from it, but unfortunately it got mislaid. We have since found it again, and hope to make some extracts, with comments, shortly. We shall always have pleasure in hear ing from you. The missing back numbers of the News shall be sent, and also the Year-Book; and the new edition of the other work you desire. The prints you enclose are very fine, and the exposures are evidently very rapid. We can quite understand your reasons for non-publication of the formula you find so valu able, and can understand your feeling on the subject. We think, however, it is an error generally to attribute superior results to superior formula. Of course, good formulae will produce better results than bad formulae; but, as a rule, superior success in photography is due to superior skill, taste, and culture. The most able and successful photographers have always most readily published their formulae, as our pages testify. They have no fear of competition, because they trust to their own care and skill, and not to secret formulae. Your specimens have many excellent qualities, the softness, modelling, and texture being excellent; but they are not precisely of the same class as M. Adam-Salomon’s. Uis pictures are chiefly distinguished by striking effects of light and shade, secured by very admirable lighting, getting great force and brilliancy, with singular delicacy. We shall have pleasure in hearing further from you, and shall take an early occasion of returning to your first letter. We will ascertain the state of your account. W. T. Watson.—The parcel shall be duly forwarded. M. B. D.—The most probable cause for your film looking dirty and opaque, and curling up and leaving the glass on drying, is having used a damp or dirty plate. It may proceed from the collodion ; but a damp plate is the most probable cause. 2. Prints produced by bichromate of potash are of a brown tint; the only fixing required is thorough washing. In the process to which you refer, in which gallate of iron forms the image, bichromate is, as you conjecture, employed with the gelatine. The prints are probably permanent. Query.—Mr. Robinson’s “Watching the Lark” is not published, or for sale. It is only procurable as a presentation print of the Photographic Society by its members. In order to become a member you will require to bo proposed by a member. The sub scription is one guinea per annum, and there is also an entrance fee of one guinea. Thanks for good wishes. Novice.—Soaking albuminized paper in warm water (not hot) will readily remove the albumen. 2. Plain paper will, we should think, ' answer your purpose best. 3. About 4 ounces of kaolin would be sufficient to use at a time, but we prefer to clear the bath by adding ' a few drops of common salt and water, which throws down a slight precipitate of chloride of silver, and takes with it the colouring matter. T. L. Howe.—The record of registrations published in our columns simply refers to those entered at Stationers’ Hall by our Publisher. J. B. B.—A 20-grain iron solution. 2. With 20 grains of sugar to the ounce of solution. 3. Ordinary loaf sugar will serve, but we prefer sugar-candy. 4. Not more than 10 minims of acetic acid, o. Made fresh, or a few weeks old. 6. With a gelatino-iron dove- ‘ loper the proportion much depends on the result required. For ordinary purposes 1 grain of gelatine to a pint of developer is suf ficient. 7. If the proportion of organic matter be small, the expo- , sure will not be sensibly prolonged. Wo prefer, in our own opera- j tions, sugar to gelatine. 8. The lens A is one of the most generally useful we know ; it is excellent for views, groups, and architecture^ 9. With ordinary apertures it will cover from 60° to 70°; with smaller stops a still greater angle may bo secured. 10. For groups, ; &c., it may be used with open aperture. 11. The lens C cannot be | certainly recommended. It is not so rapid as B, and does not B cover so well, and you cannot be absolutely certain f the quality I you may obtain. 12. Where good, it is about similar, but not soj certain. Anxious.—Opaque spots on the negative may arise from a variety of causes; turbidity in the collodion or nitr ite bath or developer will cause it. Sometimes fixing in old hypo will cause such ■ spots by a deposit of sulphur. 2. When the pyrogallic acid 1 developer discolours, and throws down a deposit, it is better to | discard it. Pyrogallic acid docs not keep well in aqueous solution, I especially if in any degree exposed to the air. 3. The only cer-1 tain method of testing the strength of the priniting bath is to precipi tate a portion of it with a standard solution of chloride of sodium. Mr. Hart’s volumetric apparatus answers well for the purpose. 4. Long floating on the silver bath will not produce any serious evil. The worst result which will arise from it is the silver pene trating the paper thoroughly, and the image being buried instead of on the surface. 5. We cannot, from your description, point out the cause of failure in your collodio-chloride. You do not state details of formula employed. II. S.—It is probable that you are using unequal pressure on your gas-bags: probably by this.means a portion of the oxygen gets mixed with the hydrogen, and so causes the explosion. It will be wise to obtain, if possible, a lesson from a person familiar with the management of the oxyhydrogen light, as it is difficult, by mere description, to call attention to all the minute points requiring attention. Articles by M. de Constant, Dr. Vogel, Mr. Stephen Thompson, Mr. Arthur Taylor, together with “Echoes of the Month,” some Re views, Letters, Translations, and Articles by the Editor, are com pelled to stand over until our next. Received, and will bo noticed shortly: " SCIOGRAPHY," by Dr. Puckett; « Photographic Mosaics” for 1869; Journal of the Quekett Club; a Bottle of Negative Varnish from Herbert Robinson, Several Correspondents in our next. Photographs Negistered. Mr. N. Briggs, Leamington, Three Photographs of Jefferson Davis. Mr. KOHLER, Margate, Photograph of Cliftonville Hotel, Margate. Mr. J. V. Hatch, Huddersfield, Photograph of Design for a Photo Calender. Mr. W. W. Gregory, St. Helier’s, Photograph of Rev. R. Leake.
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