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The photographic news
- Bandzählung
- 7.1863
- Erscheinungsdatum
- 1863
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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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- LDP: Historische Bestände der Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 235, March 6, 1863
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Zeitschrift
The photographic news
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- Register Index 619
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Band
Band 7.1863
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THE PHOTOGRAPHIC NEWS. 119 March 6, 1863.] their lenses, and both basing their construction on the calculations of Pro fessor Petzval. The lenses of Voigtlnder are characterized in a remarkable degree by intensity and perfect definition on a mathematical plane. The lenses of these makers combine qualities which render them eminently valuable to the photographer. Ponti, Charles (Medal).—A Medal was awarded for a novel instru ment styled the "alethoscope," invented by this exhibitor, by which very remarkable effects of relief and illumination are obtained. This instrument was only introduced into the Exhibition a few days before the Jurors closed their labours; they are enabled, however, to state that it will doubtless afford a new source of interest in the application of photographic pictures, and with a new object to amateurs in the art. 128 Moll, A. (II. M.), displays a remarkably fine series of photographic chemicals, showing that much care has been used in their preparation, appearing to the jury well worthy of commendation. (To be continued.) Pqotographir Butts and Queries, Crystalline Deposit on Negatives. Dear Sir,—Having noticed an article in No. 223 of the Photographic News respecting the crystalline deposit on negatives, and having myself occasionally been disappointed in taking views of any beauty whatever from that cause, I am induced to make the present communication to you on the sub ject, as my experience slightly varies from what I find stated in that article. The size of plate I usually’ work is 10 by 8 (that being the most convenient size for India, where the thermometer is fre quently over 100° in your dark tent), with a bath (glass, in mahogany case) containing about 50 or 60 ounces of bath solution ; collodion, Bolton’s and Thomas’ mixed. With these I have taken as many as twelve negatives in one day. and that without a single failure ; but a short time ago, wanting to take a view, and not having any collodion on hand but what had been either very recently or several weeks previously iodized, I chose the latter and went out. The first picture, however, that I took on fixing had a peculiar greenish appearance, and was slightly fogged, and when finished, looked as though it were covered With pin-holes; this rather puzzled me, but remembering that I had left the plate in the bath rather longer than usual (about 3j minutes), and, thinking it might have resulted from that, I coated a fresh plate, only giving it one minute in the bath, and the result was that I got as good a negative as any I have yet taken; not understanding this, I tried again, leaving the plate in three minutes, when the negative, on finishing, presented the same defects as the first one did, and I found that I could, by changing the time for sensitizing the plate get either a good or bad picture with that collodion. Being struck with this peculiarity, I tried the next day again with similar results ; but on using some new collodion, I found I could not affect it in that way, for no matter how long I left it, even to ten minutes, i» the bath, the film was even and firm and perfectly satis factory. Now, I don’t think this could have arisen from the super saturation of the bath with iodide of silver, because the bath is nearly new, and the temperature never falls sufficiently low to cause it to crystallize; besides, it only affected the old collo dion when left in the bath longer than usual. If it is owing to the collodion, how is it that it works well when only left a short time in the bath ? The only’ conclusion I could come to was that the pin-holes were caused by keeping the old collodion too long in the bath : but whether the fault was in the collodion or the bath I am unable to say, but should very much like to know if any per son of more experience and knowledge than myself would kindly inform me. Regretting that I have transgressed so much on your time and patience, believe me, yours faithfully, An Enquirer. Court House, Bombay, January 26th, 1863. [In the number of the Photographic News to which our correspondent refers, there are two articles on the subject: one by Mr. Waldack, in which he refers the deposit to iodo-nitrate of silver ; and one by ourselves, in which we trace it on some occasions to a different cause, namely, the formation of oxalate of silver. If our correspondent will read that article he will find that it is to the use of an old and somewhat decomposed collodion we refer this result. Leaving a plate long in the bath would, of course, give more time for its formation.—Ed.] Alkaline Test Paper. Sir,—It has occurred to me as an omission in many manuals of photography, and in the lists of “ requisites ” published by photographic chemists, that although litmus paper is given as a test for acids, no test is mentioned for alkali. For this reason I think it probable that many operators may not be aware of a fact well known to chemists, viz., that a paper made from turmeric will detect the slightest trace of free alkali with as much certainty as litmus will detect acid. A teaspoonful of turmeric should be boiled for a few minutes in half a pint of water; and when the decoction has been allowed a short time to settle, white blotting-paper should be soaked therein and hung up to dry. The paper will be dyed a bright yellow, which will instantly change to a red brown under the action of alkali. A gold toning bath which would cause no alteration in the colour of either test paper (litmus or turmeric), would thus be perfectly neutral. As there are many who would be glad to know of such a simple test, the above may perhaps be worth insertion. If you do not think so, pray put it in the waste basket, and oblige— Yours obediently, W. COREI. East Greenwich, March 3, 1863. [The use of turmeric paper is so familiar in chemical experi ments, that it may probably have escaped especial mention, and is worth mentioning for the benefit of beginners, who will gene rally, however, find it better to use the reddened litmus for the purpose.—Ed.] Amateur Portraiture in the Open Air. Dear Sir,—I have the pleasure to send a few cartes de visite portraits for your inspection, being the result of following out the directions given in the News and the News Almanac, and showing what kind of portraits may be taken in the open air. They were done in the country the week before last, when the frost was on the ground. Perhaps a description of the way in which they were taken may be useful, as some amateurs are apt to imagine that portraits can not be produced except in the studio. The sitters were placed against the garden wall, with apiece of canvas nailed against it for a background for full length picture ; a piece of coloured calico was nailed on one side of the background for a curtain, and a bit of carpet placed on the ground, a chair and table completed the accessories. The plates were prepared and developed in a Smartt's tent set up in the garden. The lens used was Dallmeyer's No. 1 B lens with the X stop for vignettes and the next size smaller for full length pictures. The collodion was made with pyroxyline according to the formula in the News Almanac. Ether and alcohol methylated, a 50 grain nitrate bath slightly acid with nitric acid ; developer, iron, 30 grains ; acetic acid, 15 minims ; water 1 ounce ; alcohol, 20 minims; intensified with pyro, 2 grains ; citrio acid, 1 grain ; water, 1 ounce ; fixed with cyanide, 8 grains to the ounce of water. I am sorry that printing is not better, but it was done away from homo, and, therefore, rather carelessly. They were toned in Lacy’s bath as given in the Almanac.—I remain, dear Sir, yours faithfully, N. L. Noverre. [The portraits received form a very interesting illustration of what may be done by the amateur with a little judgment and contrivance, without the manifold appliances of the professional portraitist; some of the specimens surpassing those produced “with all appliances and means to boot.”—Ed.] — The Gaiiotters.—Mr. Rolfe has just produced a card picture illustrating the modus operandi of garotting. The “nasty man,” as the operating garotter is technically named in the “ profes sion,” is just putting on the hug ; while the “front stall,” whoso duty it is to secure the plunder, with one hand seizes the vic tim’s watch and aims a blow with a bludgeon held in his other hand. The background is too light, and does not represent night, but the action is very well managed. The illustration is a little late in the market: with returning spring the public have almost forgotten that garotters exist.
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