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The photographic news
- Bandzählung
- 27.1883
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- 1883
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- Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 1286, April 27, 1883
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Zeitschrift
The photographic news
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Band
Band 27.1883
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- Titelblatt Titelblatt I
- Register Index III
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Band
Band 27.1883
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- Titel
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270 THE PHOTOGRAPHIC NEWS. simple construction as I made it, but, everything considered, I like it best of the three kinds I have used this season. My intention, before rrading the description of the one patented by Mr. Wood, was to photograph the one I made, and send a copy with sketch and description. In making it, I used quarter-inch tube, and connected the two tubes like a y upside down, as in sketch ; but before soldering them together, I soldered into the oxy-tube a piece of smaller tube with aperture of 2 in., so that it would reach to about a in. from large aperture, which is fully an 3 in. in diameter. I hammered down outside edge of hydro, tube to turn inwards, so that the gases might mix, thus forming a dome. WI believe you will see a striking likeness between the two jets, in effect at least; and it might be as well to notice if the patent for this arrangement was applied for previous to December of 1882, or even January of 1883, so that those who, like the writer, sometimes construct and use pieces of apparatus which they never think of protecting, may not run themselves into a difficulty.—Yours, ’ John Whyte. HYPOSULPHITE OF SODA IN PAPER. Dear Sir,—In the Photographic News, dated March 22nd, we read the following:—“ Much of the rapid fading so common in the present day is rather due to the presence of sodium hyposulphite in the mounts, than to deficient washing of the prints, although both causes contribute to the general result.” This is a truthful and important statement, which will be endorsed by mott photographers. I heard, when in India recently, many complaints of the instability of silver prints, and saw numbers of photo graphs in different stages of hypo disease. One frame containing family portraits hanging on the wall especially attracted my attention ; some of these originally good samples of the art were deformed by crops of the well- known mildew-like spots ; others, the colour of bad ink or iron mould ; and not a few were but ghosts of their former selves—in fact, one or two faces had almost disappeared. The climate of India has, doubtless, in addition, a pernicious effect—extremes of heat, damp, strong sunlight— and in localities the sea air exercises a solvent action. But the presence of hyposulphite in ordinary paper has a bearing beyond the mounting of photographs. It is open to a more serious accusation, viz., the injury done to gelatinc-bromide plates, both exposed and un-exposed ; for example, Itook out some clean white blotting-paper topack my plates after exposure, and usually I insert a narrow edge or slip only between margins of plates to prevent vibration, and then wrap up in the paper they are sent out with, and return to cardbook; but in some cases, inadvertently, rather more paper overlapped the gelatine surface, and I found on developing a marked deficiency of detail in that part—a corrosion or reduction corresponding to the size and shape of the contact with blotting-paper, I have since tested the paper by iodide of starch solution, and find that hyposulphite of soda is present in considerable quan tity. Again, some plates brought home unused were ex posed the other day, and I found on these, after develop ment, a distinct line of fading along the edge where the paper intervened. These plates were supplied from a well- known firm, and the paper apparently clean fine cartridge. This was subjected to similar test, and gave evidence of hyposulphite, but in smaller proportion. What must be the effect of impure paper spread over the whole sensitive film ? Simply ruinous. The wisdom of placing even tissue paper between plates is doubtful, as the material is absorb ent. However, there can be no objection to chemically pure paper confined to edge or quarter-inch magin, which would be sufficient to prevent contact and friction. Grooved boxes have disadvantages, and not the least is the bulk they take in one’s kit. The subject of packing gelatine plates evidently requires further consideration.— I am, yours faithfully, Thomas H. Morton, M.D. Proceedings of PHOTOGRAPHIC Society of Great Britain. A meeting was held on Tuesday, the 24th, Mr. H. Baden Pritchard in the chair. Mr. Sands exhibitedthis “ Gun Camera,” an apparatus for securing photographs of rapidly moving objects. It is provided with a gun-stock, and front and back sights, so as to be capable of being “ aimed ” with precision. A little stud in front permits the adjustment of focus—approximately only, of course—prior to raising the gun camera to the shoulder. Eighteen plates may be put into the apparatus, the plates being small discs of glass about the size of an ordinary eye-glass. Behind the tube con taining the lens, there is a large disc plate, bearing three brass cylinders. One contains the unexposed plates, the other is to receive them as they are exposed, and the third is an inter mediate receptacle, and is, indeed, the back of the actual camera, for it is always in position when the exposure takes place. Each sensitive plate is borne in a rim or frame to prevent the sur faces touching—looking like rimmed eye-glasses—and they are kept pressed forward by a spiral spring behind. The working of the apparatus may be imagined. The cylinder containing the plates is turned, so that one plate enters the tube, behind the lens; the intermediate cylinder then takes the place of the plate cylinder, and after exposure, which is accomplished by a revolving shutter, the plate is received into cylinder No. 3. Mr. Sebastian Davis thought that, among other things, an arrangement of the sort, only less obtrusive, might be employed in photographing refractory criminals. The Chairman remarked that cases of refractory criminals were not so frequent as supposed. He had some experience both of Millbank and Pentonvillle, and not one prisoner in five hun dred refused to be photographed. The fact was that every prisoner was accorded certain privileges, but only if he fulfilled the prison regulations, and to be photographed was one of these. Mr. Cowan exhibited some emulsion plates prepared according to Dr. Van Monckhoven’s process as described in the Year book of Photography for 1880. He referred to the circum stance that an emulsion prepared by Monckhoven’s ammonia process might have its sensitiveness very considerably increased by being re-melted, provided that some ammonia remained. An emulsion which had been partially washed was cautiously re melted, the temperature being, in all probability, not over 90"F., and it was found to be nearly eight times as sensitive as formerly. He thought that the activity of ammonia as an exalter of sensi tiveness was very much greater when the “ decomposition salts were either partially or entirely removed. A very convenient method of washing small quantities of emulsion was then de scribed. A plate is levelled and a sheet of paper is laid on it, the edges of the paper being turned up so as to convert it into a dish, after which enough emulsion to form a layer about an eighth of an inch deap is poured in. When the emulsion has
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