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The photographic news
- Bandzählung
- 27.1883
- Erscheinungsdatum
- 1883
- Sprache
- Englisch
- Signatur
- F 135
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- Hochschule für Grafik und Buchkunst Leipzig
- Digitalisat
- Hochschule für Grafik und Buchkunst Leipzig
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- SLUB Dresden
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- Public Domain Mark 1.0
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- http://digital.slub-dresden.de/id1780948042-18830000
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- Bandzählung
- No. 1316, November 23, 1883
- Digitalisat
- SLUB Dresden
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Zeitschrift
The photographic news
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Band
Band 27.1883
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- Titelblatt Titelblatt I
- Register Index III
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Band
Band 27.1883
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- Titel
- The photographic news
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738 THE PHOTOGRAPHIC NEWS. [November 23, 1883, has already been steeled, it is cleaned first of all with hydrochloric acid, and the bare copper plate is then put into the electrotyping bath. In a few minutes the plate is coated. The dynamo machine gives a very tough and solid copper plate, equal to the best that is furnished with a galvanic battery ; the machine at the Bank of Vienna has now been in action for some time, and has produced capital work without in any way getting out of order. Its electric current permits of the work of electrotyping being carried on much more quickly and uniformly than was previously the case. THE MOUNTING OF PRINTS. The mounting of prints by those amateurs and others who work on a comparatively small scale is one of those apparently unimportant and insignificant operations which are, in spite of their unimportance, liable to be trouble some and annoying in a high degree. Difficulty is found in getting the prints adjusted squarely and with equal margins on the mounts, and as often as not the print, instead of lying flat on the mount, is wrinkled or cockled up in places. We will describe one or two methods by which prints of any size may be mounted without trouble or much practice, and without any danger of wrinkling the thinnest paper. For the first method, the necessary apparatus is a squeegee some inches longer than the breadth of the prints to be mounted, and a flat dish of porcelain or other mate rial large enough to let the squeegee lie on it. A solution is made up as follows :— A sixty-grain to the ounce solution of hard gelatine, such as Coignet’s gold medal, is made up, and there is added to t an amount of methylated spirit equal to one-half the amount of the solution before the addition ; that is to say, the methylated spirit is to form one-third of the finished mountant. It is true that refined glue will do almost as well as gela tine so far as mere mounting properties are concerned, but as the quantity used by an amateur is at the most buttrifling, we recommend the more expensive substance, which is not likely to contain impurities which might endanger the permanency of the print. The flat dish is tilled with hot water. The prints are laid in this face upwards, and the squeegee is placed along one edge of the dish in the water. The gelatine solution is placed in a bowl, which is stood in a vessel containing water as hot as possible. A broad soft brush is used with the solution. There are two variations of mounting to be considered ; the first of these is that of portraits of the popular sizes for insertion in albums. These are mounted with a very narrow margin, the mounts being but a fraction of an inch larger than the print in each direction. The other is that of landscapes, or sometimes large portraits, which are mounted on boards with a wide margin, the length and breadth of the mount being nearly double the length and breadth of the print, as a rule. The method of proceeding in the first case is as follows. A mount is taken from the pile ; it is covered on the face with the gelatine solution, no care being taken to leave d:y those parts which will form the margin. A print is lifted from the warm water, is allowed to drain for a second or two, and is applied to the mount. The two may easily be adjusted so as to equalize tbe margin, as they do not adhere to each other for some seconds, so that the print will slide freely in any direction. When it is properly adjusted, the squeegee is removed from the water. It is applied to the face of the print, being made to touch it first in a line about one-third from the top. With a rapid and steady movement it is brought across the face of the prints to the foot. This causes com plete contact of the print and mount, and, moreover, re moves entirely, from that portion over which the squeegee has passed, the gelatine from the margin of the mount The squeegee is now placed in the water again for a second to remove all adhering gelatine, and is then once more applied to the print, beginning from the other end and working in the opposite direction. All this may be per formed in a very short time, and a great number of prints may be very rapidly mounted, especially if two join in the operation, one applying gelatine to the mount, whilst the other manipulates the print and the squeegee. When tbe prints are to be mounted with wide margins the process is not quite so easy. It is best in this case first of all to mark out lightly the portion of the corners of the prints on the mounts, so that the former may readily be adjusted. This is best done by drawing with a needle point two fine scratches, crossing at the spot where each corner is to fall. The mounts being thus marked, the prints are placed in the hot water as before, with the squeegee beside them. A print is now taken out of the water, and is laid face downwards on a plate of glass a little larger each way than the paper. The gelatine is applied to the back of the print, which is now taken up by two opposite corners. It is quickly turned over and is applied to the mount, the two loose corners being caused to drop as nearly as possible on to each of two opposite pairs of cross lines used as marks. The two corners, held in the hands, are now dropped, and for a few seconds afterwards the prints may be adjusted by sliding on the mount. When the correct position is got, the squeegee is rapidly used as before, but as the gelatine which is carried from under the print cannot, as in the case of mounts with narrow margin, be swept right off the mount, but is left immediately beyond the edge of the print, a cloth dipper in a bowl of hot water has to be handy to quickly wipe it away. The glass plate is wiped with the same cloth before it is used again, so as to remove any gelatine which might otherwise get on the face of the next print. The only objection to the mode of mounting which we have described is that the mounts are by its means cockled or bent inwards towards the print. It is true that this defect may be remedied in burnishing or rolling with a hot roller ; but it may be well to describe a method of mount ing which does not involve cockling the mounts at all. It was demonstrated at a photographic meeting some time ago by Mr. A. Cowan, and struck us as the simplest and most perfect method of mounting we had ever seen. The only piece of apparatus which is required is a roll ing press wide enough to admit the mounts. The prints, when they are taken from the washing water after fixing, are laid in a pile face downwards on a board or sheet of glass. An ordinary starch solution is mixed. With a broad brush this is spread over the back of the top print. It will be observed that there is no need strictly to confine the operations of the brush to the single print which is on the top. Any starch which finds its way out the backs of other prints does no harm. The prints, as they are starched, are placed face downwards on sheets of blotting- paper to dry. They will dry without curling up. At any time after the prints are dry, mounting may be performed. A mount is taken, and is wetted with clean cold water on the face. A print is put in contact with it, and the two are run quickly through the rolling press. Absolute contact without any cockling at once results. GELATINO - BROMIDE PAPER FOR POSITIVE PICTURES. Second Article. To successfully coat long lengths of paper with emulsion would require a suitable coating machine—such, for instance, as the machine employed in the manufacture ot carbon tissue on a large scale, or a modification of the Eastman dry-plate coating machine. 1 , It is not likely our amateur friends will deal with rolls 0
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