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The photographic news
- Bandzählung
- 6.1862
- Erscheinungsdatum
- 1862
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- Englisch
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- F 135
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- Hochschule für Grafik und Buchkunst Leipzig
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- Hochschule für Grafik und Buchkunst Leipzig
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- http://digital.slub-dresden.de/id1780948042-18620000
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- Bandzählung
- No. 180, February 14, 1862
- Digitalisat
- SLUB Dresden
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- Parlamentsperiode
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- Wahlperiode
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Zeitschrift
The photographic news
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Band 6.1862
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- Register Index 619
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Band 6.1862
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Ualk in tbe Studio. • The Sculptor and the Photographer. — The Italian correspondent of the Daily Telegraph, speaking of the works in progress of Mr. Hiram Powers (better known as Greek Slave Powers), says:—“This sculptor is singularly fortunate in having a son who is one of the best photographers in Florence. He has made a study of what was once an amuse ment, and, as is often the case, has surpassed the older hands. His portraits are likenesses as well as pictures. The photo graphs of his father’s works are very beautiful; but what strikes me most are his pictures taken from life, for there his sitters do not look as if they were in the stocks, or gazing vaguely at the heavens—of course void of any ‘ non-di-meno-gira’ ideas—but simply gentle and genteel ' sitters.’ ” Mr. Vernon Heath.—It will interest many of our readers to learn that this gentlemen, known so long in the photo graphic world as a skilfull artist and as the principal in th firm of Murray and Heath, is about to retire from that firm and devote himself entirely to photography professionally. The freedom from business cares will doubtless afford opportu nity for still greater triumphs of manipulatory and artistic skill than those with which all interested in photography are familiar in Mr. Heath’s productions. In a letter which is before us, we are informed that Mr. Charles Heisch, Professor of Chemistry at Middlesex Hospital, and well known to photo graphers by his researches in photographic chemistry, and more especially as one of the earliest and most consistent advo- entee of the use of bromides in collodion, assumes Mr. Heath’s t in the business in Piccadilly. We hail the accession X i a man into the manufacturing and commercial ranks of I i aphy, as tending to maintain the high position which elepartments have acquired in this country, and affording - tographers full reliance on the scientific skill which .'tends the manufacture of preparations upon which all 1 ■ tiorts depend. r.. IRATUS for India.—We omitted to state in our re- ' ■ f the Photographic Society’s meeting last week, i m- Messrs. Murray and Heath exhibited a new double swmk back camera, specially adapted for India. By a w mechanical arrangement the swing of the back is tel without any increased size being given to the camera, which is as small as an ordinary portable bellows instrument. Che adjustment for focus is effected by means of a screw, which < an be thrown in or out of gear by simply touching a spring; . nd th bellows are made of a material specially suited to resist ’ e effects of a hot climate and the attacks of insects, &c. Uo Goxxesponents, > To Advertisers.—The unusual press upon our advertising . .. Pins this week compels us to omit many advertisements. SLl K We fear that slate is scarcely suitable for a silver bath ; but having made one, your best plan will be to coat the inside with some protective varnish. A shellac varnish may be used; or better still, a mixture of osin, bees-wax, and finely powdered slate, in about equal proportions. This applied hot will give you a fine hard surface when cold. A m StIBER from the Commencement must have seen that we have . a Uy given formula for the manufacture of collodion. We have not spact to give full instructions in this column on such a subject. We may bri i ly say : take Pyzoxyline made at a moderately high temperature 10 grains . icphol, 820 sp. 1 ounce stber, 720 sp. gr. 1 ounce B .Iodide of sodium 6 grains Ditto cadmium 4 grains Bromide ditto 1 grain. You wil find an article giving full details in the Photographic News a LMA}AC. As 0 ' Eur.—It entirely depends on the purposes for which you require th lens. The No. 2B and No. 3 ordinary of the maker you name are alto- gether liferent lenses; the first is a very quick-acting lens, covering t 5 by 4, or half plate, and is especially good for card portraits ; the oth ■ is not so quick acting, and although called a half plate, will cover, wi • lieve, a whole plate. Both are excellent lenses; but your choice m 1 depend on the especial purpose for which you require to use a lens, keeping of albumenized paper after sensitizing, depends much on rcom stances. Some samples rapidly discolour; whilst others in a dry ark ' .ce keep a few days without risk It is always better to print, tone, and fix, as soon after sensitizing as possible. D I . E.—It is quite manifest that a view lens of 9 inches focus could not be i tended for views 9x7. If the lens were sold to you to cover a 9x7 plate, tod guaranteed, we should imagine that the dealer of whom you had i iu Ions will exchange it. We cannot advise you to attempt to remove the lens from the tube and replace it by another of longer focus yourself, as if you are not familiar with the work, it is probable you could not do it efficiently, and it is very important that the lens should be fixed quite parallel with the sensitive plate. First of all, endeavour to get the dealer to change the lens ; and failing in that, sell the one you have got, and buy another. Or else, get the camera body shortened a little, and take smaller pictures for the present with the lens you have. W. G.—The especial characteristics generally desirable in a collodion for dry plates are, that it should give a powdery adherent film, and possess a bromide. The powdery film may be obtained in two ways: either by making the pyroxyline with weak acid at a high temperature, or by adding an alkali to the collodion after it is made. The addition of a few grains of carbonate of soda to each ounce of collodion, and after agitation filtering, will generally make the film adherent and powdery; but the collodion does not always keep well after it is thus treated. The collodion of which the formula is given in the Photographic News Almanac may be used for dry plates with advantage. W. II. Bolton.—Shellac is readily soluble in a hot solution of borax and water. Have you used sufficient heat ? Or try the adoption of a little more borax. J. B. Y.—On page 248 of our third volume (No. 72), you will find full instruc tions for making and using a specific gravity bottle, by which the specific gravity of all kinds of solutions may be ascertained. Tom Gardner.—The silver solution running in greasy lines when the plate 1 is removed from the bath, will occur from a variety of causes. In your j case, it is probably from the use of a collodion which gives a horny repel- ; lant film. When that is the case, the addition of one or two drops of ; distilled water to the ounce of collodion will often prove a remedy. Also, move the plate repeatedly in and out of the bath during the time of exciting. 2. The only way in which you can keep size ready for use is to keep it in a very cool cellar. 3. If the water placed on your white lead becomes white and turbid, it shows that there is some adulteration, as carbonate of lead is insoluble in water. C. F. Booker.—The probable cause of the peculiar cracking of the film you describe, is that some traces of the hypo or cyanide had remained in the I film, not having been perfectly washed out after fixing. This has gradually absorbed moisture under the coating of varnish, and then from changes of atmosphere caused the cracks. For those films which are cracked there is no remedy. To prevent others already varnished from going, keep them in as dry a place as possible, and be careful to wash well and dry well in future. Sometimes, however, these cracks will occur after every known precaution has been taken. Toby’s Ghost.—All dry plates must be wet all over before applying the de veloper. 2. Your question “ how to distil the essence from anything not a liquid ” is not quite clear. If you refer to essential oil of flowers, &c., they should be bruised well, macerated in a small quantity of water, and then placed in the still, and submitted to as low a temperature as will serve the purpose. If, however, you are not familiar with such operations, you had better see a chemist manipulate before attempting it yourself. 3. In order to avoid injuring the film of wet plates in placing them in a box, use a box with V shaped grooves. X. Meson.—It is desirable to wash the print carefully for a few minutes be tween toning and fixing. As a rule, the time required for fixing is about, fifteen minutes ; but the time will vary with the kind of paper, a soft ab* sorbent paper being quickly fixed, and a hard repellant paper requiring i longer time. Alphabet.—The price you name is a very low price for a portrait lens. You may by chance get a good one for the money ; but not with certainty. You cannot get, as a rule, a standing figure well defined on a quarter plate with a common quarter-plate lens. To ascertain if the visual and actinic foci are coincident, place a pile of books upon a table, each one an inch orlAgo further back than the other ; then focus for one in the centre, and if on taking a picture that one is sharp, the visual and actinic foci are coin cident ; if that one be out of focus in the picture, and some other books in, the two foci vary just in the proportion indicated by the position of the books. In such case your dark slide wonld require adjusting to the amount of difference. 2. When a collodion dries slightly opaque or opalescent when merely poured on glass it is unfit for producing positives. The only remedy is to change the sample of collodion. 3. The production of instan taneous pictures depends on good light, and good lens, silver bath, collodion, and developer, all being in harmonious relation and in careful manipu lation. I Jacobus.—The dealer whose name you mention as No. 1 is a retailer of second-hand apparatus and a respectable man ; but it is of course impos- j sible to guarantee second hand goods without trying them. Of the two j lenses, regarding which you ask our opinion, we have no means of judging 1 which will suit you best. A rack and pinion is not necessary if you have a ready means of adjusting the camera body. For general landscape pur | poses we prefer the ordinary view lens of the maker you name to his ortho graphic. Cornish Chough.—Your pyroxyline has been made with acids slightly too weak, and has consequently a slight tendency to crape, and also to dry rather opaque. With care in manipulation, it may, however, be made to work very well. The sole cause of your difficulty in the negative sent i8 under exposure. The plate required at least double the exposure ; with full exposure you will get both foreground and distance properly detailed’ A little more bromide to the collodion will be an improvement. W. W.—We do not know any specific house of whom you may get "Judan asphaltum,” but you will probably succeed better in getting it through a respectable drysalter than a chemist. Probably it may be known aS “ Egyptian asphaltum.” Should you still fail we will make some enquiry in London. Wm. Clark requires a good process of transferring an engraving from paper to glass. He at present varnishes the glass and brings the print into con tact with it; then places the whole in water containing a little sulphuric and nitric acid. He is not quite satisfied with the result. Can any of our readers give additional information. We fancy the process he uses is a good one, but probably requires practice to ensure success. A. B.—It is possible that by proper effort you may succeed. We will sec 1 we can aid you. Negative Varnish.—In the recipe for negative varnish given in Mr. Warner 3 letter in our last, for “turning” the plate read “warming” the plate. E. T., J. II., J. Jones, Economy, E. E. L., and several other correspondent together with several articles in type, are compelled to stand over untr next week.
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