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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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- Public Domain Mark 1.0
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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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- oai:de:slub-dresden:db:id-1780948042-18620000
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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. 195, May 30, 1862
- Digitalisat
- SLUB Dresden
- Strukturtyp
- 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
- Ausgabe Ausgabe 85
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- Register Index 619
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Band
Band 6.1862
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- Titel
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Ma , 1862. : they, ' thegb leanlina nsure t nvenien’ ad to t led for OSt hap lie sot c,as,b5 / have 1 '! hich2 - a void 1 filte imagh s isp relyr and 1 toucb! ct copB Itis™ ges of it I ld v spurP gatitda posits bl lie sio?, VshCI aypozt them thep1 cbeatk ; cou"S I ileto0 d, adl ! le’edg; gatit2r '“I neral '. ; is p° nberda ■ ceto" ryP res i’v oct d Sensi" I 91 1 < POM'; les TOI nti.V ■ !a g MaY 30,1862.] THE PHOTOGRAPHIC NEWS. 257 dered in their design. IM in E-no, section SlloWn in 18. 2•, stain pun out O1 SUouU SueeU SuUN- There is no way, I think, of packing sensitive p a es, percha, and fastened into the box with a waterproof glue or Aether for travelling, or keeping at home during a ong other cement. The gutta-percha extends to the bottom of Period, so good as that adopted by Dr. Hill Norris for his the box, but the grooves finish about J of an inch from the Relatine plates, which are sent in this manner to all parts o bottom, so that the plates may be kept from contact with fl, 11 .tuL+hninciniurenorlonsinotheirsenstiveness. ’ I • the wood. It will be seen that such a box may be kept in any “.nil for the reasons given above to be preterreu to any Kimi climate or atmosphere, or even under water, without the of plate box. two strips of s ou paper, a ou inches sensitive plates contained in it being in any way injuriously wide are well dried and doubled up four times, making each affected 1 °m a four fold strip about 1J inches wide. These are folded ' ' (Tobe continued ) backwards and forwards as many times as the package is t 1 J Stieutifit Gossip. 1, UI LU ML UIIC VC PCI SUlIP •-18 ML --—IE Pi--M •V 1 _ n r When all the grooves are full, the back of a plate F USIOX OF Two HUNDIEDWEIGIIT of Platinum— NITRATE or 1. . 1 c 1 , 1 Srrvrp R Acv N,ri A n AMrrrw PrrvprI IM IIYT V .V1 I T Silver—Rock Salt and Aniline Purple in the Exhi ¬ bition—Examination of Glass in the Spectroscope. England, we published the first descriptions of his wonder- Great was the astonishment and incredulity with which the account was ■ tie world, without being injured or loosing their sensitiveness. H is extremely inexpensive, compact, and entirely efficient, and for the reasons given above, to be preferred to any kind In the paper grooves thus formed the plates are laid one over another, one of the paper strips being of course placed at each end. " " ’ " usual way, and closed with a spring snap. Upon the edges of both the box and the lid, are fastened bands of vulcanized being outside top and bottom, they are tied round firmly with string and enveloped in paper, making a compact parcel. This is wrapped up in a piece ofthin sheet gutta-percha, or mackin- to contain plates: from eight to ten will be found a conve nient number. india-rubber, previously boiled in potash to extract all the free sulphur, which, when the lid is closed, press firmly on each other, like the human lips, and form a perfectly air tight joint all round. The grooves for the glasses are of the section shown in fig. 25, stamped out of stout sheet gutta- is buried in bran contained in a common deal box, } an inch larger each way than the packet. Plates so packed are securely guarded against light, atmospheric moisture, and rough usage. They will travel safely without further Fig. 20. The only intention in their use, is to preserve the plates from mechanical injury, and from dust. Boxes intended to hold sensitized dry plates, have other conditions to fulfil, and it will be found a wise economy to provide separate boxes, devoted specially to this particular me, rather than to employ one kind indifferently for every purpose. They need not necessarily be expensive, but they cannot be made so low in price as the simpler class for nega tives. One of the chief causes of spontaneous decomposition in a sensitized dry collodion plate, is damp ; indeed I am very inclined to believe it is the only one, and I think it not improbable that a prepared plate kept in a perfectly dry condition, would retain its sensitiveness indefinitely. The intmsion of air, which always contains a certain amount of moisture, should therefore be scrupulously guarded against. The joints and lid must be air-tight, and the pores of the wood—if that substance be employed in its construction— must be filled up. The grooves must be so formed, that no part of the surface of the glass can touch their sides, and they must be made of some material not liable to be scratched or chipped by the sharp and hard edges of the glasses as j they slide in them, because the fine particles thus separated, 1 adhere to the plates, and cause spots in the negatives. Metal boxes with metal grooves are open to this objection, . as tiny spangles of metal are ground off by the hard glass, which cause a real amount of mischief. A coating of gutta percha or india-rubber varnish, or a solution of any neutral and not brittle gum, lessens this objection to metal grooves, but the coating must be very thick to make their use perfectly safe, and I think it will generally be found advisable to employ at once some softer substance on which the friction of the glass edges has no effect.'' The fastening should be attached to the box, and not be a loose piece which can be mislaid : probably the best kind of fastening is a spring snap as with that the mere shutting down of the lid fastens it also. . As the grooves of the boxes must be made sufficiently large for the plates to slip freely into them, they do not offer a suitable means of packing the prepared glasses for tra velling, as they would run great risk of being broken with a very little jolting ; and if cotton wool, paper, or any other kind of padding be placed with them to keep them firm, they may get covered with dust. The dry plate box should only be used at home, and even then not to stow the sensi tive plates away for any considerable time, but only, to deposit such as are intended to be used within a limited period. Therefore the clement of bulk need not be consi- sSincs writing the above Thave seen a very excellent plate box, intended ful results which appeared in this country. Erapherinrustowing sensitive plates, manufactured by a well-known photo-cm * "" -hick X are used. mhessnuEuttazpercha, grooves, nearly similar to those described, received. It is true that platinum had often been melted by are made i „eboxes are very well suited for the use for which they , i ,, A 1 1 . 2 ’ can be obtained of all sizes at a reasonable price. | the oxyhydrogen blowpipe in small masses, and scientific protection, or can be put in a portmanteau, or bag. At home, they can lie in a drawer or on a shelf, and in all cases can be easily got at when wanted. The following description of a box for sensitive plates, will not be found open to any of the objections I have stated; I think it will be found generally efficient, and at the same time not expensive. Wood should be selected as the material in preference to metal, as this latter when made of moderate thickness is too flexible to be of any serviceable protection to its contents in case of a fall or blow. But, for the double purpose of excluding air, and of preventing any escape of volatile essences the wood may contain, which might produce an injurious effect upon the prepared plates, it is necessary that the pores of the wood be effectually closed. This is achieved by soaking the various pieces, after they have been properly shaped, for a few minutes in melted beeswax. The ordinary white wood generally used for plate boxes is well suited, as its soft structure readily absorbs the wax. When each piece has been thus treated, and the superfluous wax well wiped off from the surfaces, I the box is to be put together with a waterproof glue and screws The lid is fastened on with strong hinges in the wrapped up i n a piece of thin sheet gutta-percha, or mackin- At the time that M. St. Clair Deville’s experiments were osh of suitable size, also securely tied round, and the whole known to very few in Paris even, and totally unknown in
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