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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
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- urn:nbn:de:bsz:14-db-id1780948042-186200003
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- http://digital.slub-dresden.de/id1780948042-18620000
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- Seite 1-72 fehlen in der Vorlage. Vorlagebedingter Textverlust.
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- Parlamentsperiode
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- Wahlperiode
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- Bandzählung
- No. 184, March 14, 1862
- Digitalisat
- SLUB Dresden
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- Ausgabe
- Parlamentsperiode
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- Wahlperiode
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Zeitschrift
The photographic news
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Band
Band 6.1862
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- Ausgabe Ausgabe 73
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- Register Index 619
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Band
Band 6.1862
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- The photographic news
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Mai [March 14, 1862. THE PHOTOGRAPHIC NEWS. 122 have a e mark. It is probabl have, a pleased with this plat wholly red. We recently sug arrang t , ie nner gives t or, indei IAEt The ter. amount i More anc eac ill • •d-aeuet eAFellelu- -nd1Ve1, WIUII • — .o ,• •I nil photometer; every precaution being taken to ensure aCD "ce bee * PIOTOGRAPIIIO News, vol. v. p. 18. racy. (of the obtaine to thei experir results made Whate the atte to empl Refer suggests Inents m would be useful; they now supply sets with each size 0 press ; but these are not necessarily included with the pre" and must, therefore, be ordered separate by those who I quire them. We may here suggest, however, a very simp* mode of getting the same result, without the copper-plate It consists in cutting a piece of stout cardboard with a ft surface to the necessary size, and trimming it carefully so’’ to have a true edge with a slight bevel. The print shotl be well rolled first; the piece of cardboard must then h placed in the right position on the face of the print whio must then be passed through the press again ; the prinl will this time be placed on the plate face upwards with tb smoothest surface of the cardboard in contact with it, at purposely to test this question. The experiments were m in a blackened experimental chamber, with a Bunsc ain of r The su considerable care. The gas em dent ra " Single glass Thick I Crystal “ Doubl glass “ Doubl English Orange “ Berks grout of its “ Doubl “ Berks! “ Single • Scientitic Gossip. roller worn in the centre. This renders necessary the " facing of the roller in the lathe, and the substitution of° between it and the roller : care must be used to prevent tb roller displacing the piece of card. This will give the ph? mark very well; especially if—as where the India tint 7 0 used is commonly the case—plate paper be used instead d preen CI cardboard for the mount. The effect is worth the troubl entirely new bed. A short time ago we called attention to the great iu provement effected on the appearance of a print by mounl ing with a small margin of India paper, or a tint to " semble it. Another great improvement, giving a satisfy tory appearance of finish, is the plate mark, a purely conventional taste which is 1 ’ mark; but still the effect is admired. .._ J gested to Messrs. Bury, Brothers, that a series of coppeT 2 , . plates for different sizes of pictures to produce this math ofejio .,1,1 L. 1/4,1 ■ +kox nAw cinnlv cn+c ;+k oAch cie 0 8 Version ( ployed was prepared fro" fectly in Photometric Experiments—Value of various kinds ( ligtee V Glass as Transparent Media—Effects of Ground Gu againsto. —Bouguer’s Experiments on Transparency of A" bir • I Water, and Glass—Draper on the Spectrum of Ixo roomg, descent Platinum—Examination of Coloured Glass PperPdet the Spectroscope. numbers Some time ago* we gave an account of some experiments o"stances 0 the absorption of light by glass, which had been recentll amount tried by Mr. King. The importance of the subject from' hook he' photographic point of view is very great, and we are then the intei fore glad to be enabled to lay before our readers some add 1 ' tional experiments on the same subject, which have mo" recently come under our notice. The experimentalist I Mr. F. H. Storer, and the trials have been conducted wil ence to the separate adjustment, on the ground that the slightest derangement of the single adjustment gave an uneven pressure, without the means of regulating it. The results produced by the machine we have been working are in the highest degree satisfactory; a most perfectly even burnished surface is given to the print, which seems to have a similar effect to the varnishing of a painting or polishing of wood; detail before scarcely seen seems to bear out in a most surprising manner, giving the utmost deli cacy and finish to the print. Until the trial is actually made, it is difficult to believe the difference in a print which can be produced by the mere change of surface. Of course, this improvement in appearance results from rolling by any good machine possessing a perfectly burnished plate, and giving very powerful pressure. The especial claim to attention which Messrs. Bury’s presses possess consists in the fact that whilst they are very strongly made, very easy to use, and very effi cient in result, they are also very cheap. As our readers are aware, we are very cautious at any time of becoming the advo cate of cheapness, or rather of lowness of price, if efficiency in the slightest degree have to be sacrificed in its attain ment. Cheapness, falsely so called, has been the bane of photography, multiplying difficulties and spoiling results. But where moderation in price can be secured, especially in articles necessarily expensive, without any sacrifice of effi ciency, we have pleasure in calling the attention of our readers to the advantage. A short time ago, if we are not mistaken, a rolling press of the smallest size cost £12, now they can be purchased without any sacrifice of quality for less than half that amount; a press of the size we have been trying used to be charged something like £40 ; now it can be purchased for less than one fourth of that sum. A few hints as to the mode of using rolling machines may not be uninteresting. Of course they must be kept dry. If kept in a dry place, and in tolerably constant use, there is no danger of injury from rust. It is manifest that the highest efficiency should be the first consideration ; if that were not the case, brass might, as has been suggested, take the place of the plate of burnished steel, as being much more easily kept in order; but the superiority of the latter, in point of hardness and polish, will fully repay the extra care required in keeping it in order. Where the machine is only occasion ally used, especially if it be not kept in a very dry atmo sphere, a thin coat of tallow or wax spread over the polished plate would effectually protect it; and under all circum stances it will be wise to have a green baize cover for the hours when not in use, which will protect it from dust, and in some measure from other injurious influences. Where it is necessary to use very heavy pressure so as to secure the highest surface, it will be found desirable to pass the mounted picture through the press first with a lighter pressure, and then again with the rollers screwed tighter down. The result will be better, and more easily attained than if the heavier pressure were put on at once. This is especially desirable where the print is cockled or inclined to curl, as in that case there is some danger of a crease being formed, which will leave an indelible mark in the print. In rolling unmounted prints especial care in this respect is necessary, as if a print in the crumpled rough state, com mon to some samples of albumenized paper, be submitted to a heavy pressure at once, creases, which will mark or cut the print, are inevitably formed. The best mode of rolling unmounted prints is to place their face to the plate under a piece of card-board, and sub mit them first to gentle pressure so as to get them flat and smooth, and then roll heavier if necessary. There is less danger of the unmounted print being drawn into creases when a piece of card-board interposes between it and the roller than when it is without such protection. In rolling small pictures, such as cards, it is desirable to place several in the press at once, so as to cover the whole breadth of the plate. This economises time and saves the machines. Where one small picture at a time is rolled, and that always in the middle of the plate, the bed gradually gets sunken, and the y it. At all events, no suonYe to ex number of experiments moa "nder I, aoouwanta wore man rajn i Purple c especially whenever an ample margin is present. Poha0 We may add, in conclusion, that the press should alwaf ' FTIA be screwed on to a firm bench or table; or, where it is * large as the one we have spoken of, it should have a Strom to 0 . stand of its own ; as it is impossible to work with satisfof w Io,is tory pressure unless the machine is firmly fixed. Instead of lamp shades, which were used in Mr. King experiments, flat sheets of glass, six inches wide by eis" inches high, were fitted to a rack of blackened wire, whlls, -porno was fastened to the photometer bar (100 inches long) aD by any , distance of three feet from the gas-light. It did not that the distance from the source of light at which the 811 Polished screen was placed had any appreciable influence upon 1. greens oi amount of light transmitted by it. At all events, no s» * influence could be detected in a caking coal expressly for these experiments, and was co" #s applil tained in a special gas-holder. The illuminating powet ° "eat. 0 the gas when consumed from the Parliamentary Arga deduced burner, at the rate of five cubic feet per hour, was eq™ ally onl to 1G candles, consuming 120 grains of spermaceti perhot The scree MPagated 1 "ohsreq IPoportio
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