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The photographic news
- Bandzählung
- 27.1883
- Erscheinungsdatum
- 1883
- Sprache
- Englisch
- Signatur
- F 135
- Vorlage
- Hochschule für Grafik und Buchkunst Leipzig
- Digitalisat
- Hochschule für Grafik und Buchkunst Leipzig
- Digitalisat
- SLUB Dresden
- Lizenz-/Rechtehinweis
- Public Domain Mark 1.0
- URN
- urn:nbn:de:bsz:14-db-id1780948042-188300004
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- http://digital.slub-dresden.de/id1780948042-18830000
- OAI-Identifier
- oai:de:slub-dresden:db:id-1780948042-18830000
- Sammlungen
- Fotografie
- LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
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- Parlamentsperiode
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- Wahlperiode
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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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- Titelblatt Titelblatt I
- Register Index III
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- The photographic news
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742 THE PHOTOGRAPHIC NEWS. [November 23, 1883. price of which is about twelve shillings a yard. A nice brisk nap is required in the velvet, and this cannot be obtained unless a good price is given. The serge, before it is sewn on, should be scalded in hot water, so that it will not ruck afterwards, and the velvet must be fitted by a skilled seamstress. The so-called carpet stitch is best adapted to the purpose, the ends of the velvet not overlapping, but drawn together so as to meet. In this way the seam is not a ridge, but perfectly flat, and the roller does not set off at this spot. It need scarcely be said that this can only be attained with very fine stitches. The velvet is cut out exactly to size, and sewn on the block. The velvet roller is ready for use as soon as it is made. Unlike the leather roller, there is no need to get it into condition. In the same way it may be put away in its linen bag as soon as done with, though perhaps it is best to clean first; the bag keeps away dust, and the grease in the ink will keep the velvet from becoming hard. Of course you can’t scrape a velvet roller to get the ink off, as you do a leather one; you can only free the velvet of its ink by rolling. The roller is passed over a clean slab, and this is scraped from time to time. The slab gradually pulls the ink off, and this is then removed from the slab by scrap ing. If you are not able to get off all the ink in this way, pass the roller over a sheet of soft paper and apply a little turpentine. After a little practice you will soon know when the roller is free from ink. The ink is thinned by the addition of turpentine, so that if at any time it is too thin on slab or roller, a little delay will at once mend matters to allow for the evaporation of the turpentine. One of the great points, we repeat, is not to apply too much ink to the print; in fact, very fine lines should remain almost bare, for then there is no disposition for them to spread or “ smash " when subjected to pressure on transfer to stone, wood, fabric, leather, or other material Zebieb. Melissa’s Victory. By Ashton Neill. With Illustrations by W. Gunston. (London: Methodist Sunday School Union). “ Melissa’s Victory ” is illustrated with a dozen inset “ ink photos,” reproduced from the original drawings of the artist by Messrs. Sprague and Co. We must confess to being more interested with the elegant and artistic little sketches than with the text of the book. The story appears to have been written with a view to instil into the youthful mind the doctrine that to go to a Methodist Chapel is regarded by the majority of mankind as a grave social offence; but the public are in error in taking this view, as what they regard as a fault, is, in reality, a high virtue, especially when the deed is done by a young giil in opposi tion to the wishes of her parents. Melissa is the young lady who neglected the Parish Church for a Methodist Chapel, and we find her represented in the frontispiece with two girl-companions, wandering down a country lane. This tasteful little picture might well be an instantaneous photograph from nature, so well has the artist caught the easy and graceful attitudes of his models. Farther on ws find a striking little fire-light scene —Melissa breaking the news of her defection to her mother and sisters. In looking at this picture, we fancy we trace some kind of resemblance to the peculiar lighting of the chamber photographs produced by Karelin, of Novgorod. We think a scene of this kind might well be represented photographically, even without combination printing, as the fire itself is quite covered by the chair of Melissa’s mother; but any model capable of realising the meek and contrite aspect of Melissa would be a treasure indeed to the art photographer. The reproductions of Mr. Gunston’s pictures are rendered much more realistic by the circumstance that the titles have been written, and are reproduced along with the drawing. “ And as sho sat in the glow of the setting sun ' has meritr ; but the figure, and more especially the head, is far too brightly illuminated for the surrounding". The artist has made the mistake of importing into his work rather too much of that local lighting which characterizes stage effects ; but many artists of the highest repute fall into the same error. PHOTO-LITHOGRAPHY AND PHOTO ZINCOGRAPHY. BY MAJOR J. WATERHOUSE, B.S.C., Assistant Surveyor-General of India. Chapter XIV.—Asphalt Process. Continued. Wsnowcometothe practical details of the asphalt processes, and shall first consider them in a general way, giving the description of a few typical processes afterwards. Choice of asphaltum.—The first thing to be done is to select a good specimen of asphaltum. As we have seen in the last chapter, the Syrian asphaltum is the kind to be preferred, it obtainable. It is darker, harder, is more sen sitive to light, and has a higher melting point than the other kinds. Solutions of it show three very weak absorp tion bands in the spectroscope; less sensitive kinds show the bands more strongly. Purification.—As obtained from the dealers, asphaltum is generally fit to be used at once ; but if necessary, it may he purified by powdering it, and digesting it with dilute hydrochloric acid, which dissolves the earthy particles. Some writers recommend a treatment with boiling water, by which soluble and earthy particles may be separated out. Extraction with ether.—In order to obtain the most rapid results, it is, as shown in the last chapter, desirable to extract the most sensitive constituent of the asphaltum with ether, and to use it alone in making the sensitive solution. Dr. Kayser indicates the following way of doing this Syrian asphaltum is divided into pieces about the size of a pea, and dried in the dark at a temperature of 409 or 50’ C (104° to 122° F.). It is then powdered and shaken in a bottle with three times its weight of ether, then allowed to settle, and the ethereal solution decanted off. This treat ment is repeated, and then a quantity of chloroform, about double the weight of the asphalt first employed, is added to the residue. The mixture is well shaken till the bitumen is dissolved, and left to settle. The clear solution is de canted off, and evaporated over a water bath. The residue is the true photographic asphaltum, and a solution of it in turpentine forms the sensitive varnish. Morch makes a strong solution of suitable asphaltum in chloroform, and adds to it about three timesits volume of ether. This precipitates the insoluble constituent, which is collected on a filter, dried, and dissolved in benzole. The writer finds it sufficient to digest the powdered as phaltum in a bottle with an excess of ether, shaking it up from time to time, and, if necessary, stirring it with a glass or wooden rod. The ether is changed at intervals of a few hours, till all, or nearly all, the soluble constituents are removed. The last ether is then poured off, and the residue thoroughly dried. Husnik and Toifel recommend a similar procedure. A solution of sensitive asphaltum, ready prepared by Prof. Husnik, is obtainable in Berlin and Vienna. The writer has found it answer exceedingly well, being much more sensitive than the ordinary solution of asphalt. Before long it will no doubt be easy to obtain the solid extract ready prepared, and this would bo a great convenience, because asphaltum of the proper quality, containing the largest proportion of the sensitive constituent insoluble in ether, is not always obtainable, and in using inferior kinds there is a waste of ether. . . . It is worthy of note that tho principle of increasing t o
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