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The photographic news
- Bandzählung
- 27.1883
- Erscheinungsdatum
- 1883
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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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- Bandzählung
- No. 1295, June 29, 1883
- Digitalisat
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The photographic news
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- Titelblatt Titelblatt I
- Register Index III
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June 29, 1883.] THE PHOTOGRAPHIC NEWS. 411 influence on them, lost their brilliancy in a very short time, indications of fading at the end of that period. set forth and specified. —which, if allowed to remain a few weeks longer, might have developed into yellow fever, as fading is sometimes desig nated, thus corroborating that portion of the previous writer’s flat surface, and the varnished zinc plate be placed upon it and be pressed to secure adhesion at all unperforated parts. When the work is sufficiently dry, a coat of varnish is put on the outer surface of the paper ; and if the plate is desired to be of special strength, a second sheet of tracing paper is applied upon the first, wherein the mounted photographs, previously soaked in water, were packed away in the cellar, no especial care being the surface finely-divided metal, either obtained from thin plates , or from oxides, nitrates, sulphates, or in solution, or by coloured sands. I then place the bulb in a matrix or mould, having some ornamental pattern upon it so as to form a pattern in relief upon the surface of the metalized glass ; or I produce such pattern by means of rollers or any other convenient method of obtaining a pattern in relief upon the surface. 1 then coat the bulb again with glass, and complete the formation of the article. Or in some cases I may dispense with the process of embossing the pattern upon the bulb, and, instead thereof, lay upon its surface patterns produced in thin metal, and then cover with the outer coat of glass as before described ; thus, in either case obtaining distinctive metallic patterns or ornamental designs under the surface of the glass, both the inner and outer face of the glass articles retaining their ordinary smooth surface. Having thus described the nature of the said invention, and the manner in our ranks, and such excellent opportunities afforded for diffusing the experience gained through the medium of the 5824. A. J, Nash, “ Ornamental glass.” This invention refers to the embellishment of articles formed of glass in the following manner:—I take a bulb to form (say) a bowl of glass, and whilst still upon the blowing iron, 1 apply to more especially during the winter months. One show-case 1 remember situated on a railway bridge among other advertising boards required refilling about every seven or eight weeks during damp weather, or the reputation of the firm would have suffered, seeing that thousands of INFLUENCE OF MOISTURE, ETC., ON SILVER PRINTS. BY W. M. ASHMAN. It is not my intention to offer excuses for opening up this I old and well-ventilated subject, because I hold that it is the duty of every professional photographer who caters for the public to mention anything he considers worthy of notice which may tend to the better preservation of silver prints. It is a duty he owes to the community at large. Since the first introduction of silver printing, this doctrine has always held good, and whenever a new fact has been discovered, practical men have investigated and published their experi ences regarding it ; thus it is that photography is enabled to hold her position in the front rank with the sister sciences. Having such an abundance of indefatigable workers in Having a damp cellar at hand, I repeated the experiments detailed in the above-mentioned number, and obtained similar results in each case. Other experiments were tried, mental devices may be applied by means of thin coloured gela- tine ; or the paper or woven fabric may, previously to being applied to the zinc, have coloured or other devices produced upon it by printing or otherwise. Ornamental devices may be formed by cementing pieces of coloured glass upon the perforated metal sheet, or Dlate : and when +L. ... . r , ■ ,1- and is varnished on its outer side. To render the plate stronger photographic press, it sometimes, but very rarely, happens, and more durable, additional coats of varnish may be applied on that points of immense importance do not receive the atten- both sides. According to a second modification, a sheet orPlateof tion they deserve from the great bulk of experimentalists, zinc having perforations, which are, by preference o the size Perha ps'fashion may prevail in this as in some other matters, known as‘‘No 8,’is treated with a coating consisting of a strong I, 1 ;., 5 . ., solution of Silicate of soda or soluble glass, so that the solution and rapid exposures, with accessories thereto, may be the may fill the perforations. This may be effected by placing the zinc burning question of the hour But I am wandering from the plate on a slab of plate-glass placed horizontally, orona smoothly subject. If my readers will piease refer to No. 1281 of surfaced slab of slate, marble, iron, or other suitable material to this year s volume of the Photogkaphic News, they will find which the soluble glass will not adhere. One or two coats of the an able leader, entitled, “Hyposulphite in Mountsand solution having been applied, the slab is placed before or beneath Paper.” The writer sets forth that damp is the chief cause a fire, or heat is otherwise applied to dry the outer surface of the of rapid fading, aud with this dictum I entirely agree, solution, after which the zinc plate is removed from the slab, and For some years previous to the publication of this article I its other surface is dried. When the soluble glass is quite dry, have noticed that photographs exhibited as specimens in both sides are coated with copal varnish or other suitable I show-cases out of doors, also on railway platforms, station varnish The translucent substance may be coloured or rendered walls, and places where the sunlight could have but little ornamental by means of transparent colouring matters. TheliA.'nNham Inetthai. hoianaw in • vavy cha +ima improved plates or sheets may be used for a great variety of pur poses, amongst which may be mentioned lanterns, window screens, fire screens, and illuminated advertisements. Orna- forated metal or wire gauze, such paper or fabric being rendered translucent by means of any suitable substance such as gelatine, wax, varnish, drying oil, or soluble glass, before or after being attached to the metal. When gelatine or soluble glass is used as the translucent substance, it should be treated, when dry, with an external coat of varnish to protect it from the action of moisture; and in the case of gelatine, a small proportion of glycerine may be mixed with it to counteract its tendency to shrink. In practically carrying out my invention according to one modification, I first prepare the perforated zinc plate by rubbing both surfaces with a piece of sandstone. I then apply a coating of spirit varnish, or other hard clear varnish, and place on the plate a sheet of thin tracing paper of the kind used, by mechanical draughtsmen, taking care to stretch it evenly and without wrinkles. Or the paper may be laid out smoothly on a taken to find traces of hyposulphite by any of the usual means. At the end of two months these photographs were examined, when it was found that very little of the original picture remained in any of them; while in some cases the image had completely vanished, and the mount was covered with a fungoid growth, the fibres of which extended quite an inch beyond the spongy excrescence. Perhaps this might have been expected, for we know albumenized paper, if stored in a damp place, will in time be covered with spots of various hues, no doubt due to decomposition of the size con tained in the paper, also the coating of albumen. Card board and materials used for mounting the photograph assist largely to produce a like result. I have coated prints -i ' iaraffin, various gums, collodion, and other people passed these specimen photographs daily. I - . “ - - —— uu gaabb upon tne perzoraveu iueuat । don t mean to convey the impression that these sheet, or plate ; and when the ornamentation is effected in this photographs had faded very much, like some auctioneers’ way, a sheet ot thin paper or woven fabric may be attached or specimens of property for sale, for they had not; but the cemented ever the glass, and be varnished on the outer side. I critical eye might have discovered a degradation of the Having us par icularly described my said invention, and the whites—or, in other words, a slight yellow tinge in the lights manner of performing the same, I have to state that I do not 1 -—2 • . . 8 restrict myself to the precise details herein described, but that what I believe to be novel and original, and claim as the inven tion secured to me by and in terms of the hereinbefore in i » . , . l , part recited Letters Patent, is the combination of perforated experience, where he states that punts mounted on card- metal sheets, or plates, with translucent paper, woven fabric, board free from traces of hyposulphite, and placed tor six gelatine, or other suitable translucent substance, substantially in weeks in a damp cellar, were found to show only the slightest the manner and for the purposes hereinbefore described. I indications of fading at the end of that period. uesoIIed vle nauure •L •MIE •OI -m-1) •uM UUV ouM-I AU I m • 111. 1 . which the same is carried into effect, I claim the improvements with beeswax, paratin, various gums, collodion, and other in the ornamentation of glass, as herein more fully set forth and I substances hitherto recommended for the purpose of specified, but I do not limit myself to the precise details herein [ rendering the paper more impervious to moisture, but they do not appear to fare any better than prints not so treated.
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