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The photographic news
- Bandzählung
- 24.1880
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- 1880
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- Englisch
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- Hochschule für Grafik und Buchkunst Leipzig
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- Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 1156, October 29, 1880
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Zeitschrift
The photographic news
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Band
Band 24.1880
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- Register Index 631
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Band
Band 24.1880
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526 THE PHOTOGRAPHIC NEWS. LOCTOBER 29, 1880 them up to this spot, carefully keeping myself out of range, and expose unknown to them. It is quite useless to attempt such subjects if you go about it as per studio rule—posing, focussing, inserting plate, then requesting them to be still and look happy. What do they look like ? If well trained and obedient they will grin, certainly, if promised a reward ; if shown a toy, or something amusing, they stare and look like having their portraits taken; but no real life —no naturalness ; they can’t do it to order under ouch a series of inflictions. The lens was a common French quarter-plate I bought, twenty-two years ago, for a few shillings, with a fixed stop where we now place the Waterhouse diaphragms ; it was never intended for cabinet pictures, but covers fairly. I do not prejer such a lens, but it is the only lens I keep at home for testing emulsion. The shutter is one of my own construction and make, and is a rude affair, but which I think worthy of a better manufacturer. It is simply a small balance made out of a child's toy-box of “ scales and weights.” One brass pan is attached with a little gutta-percha to one end of the beam, like an inverted saucer—at the other a thin disc of brass is fastened perpendicularly in front of the lens, having a slit capable of being enlarged or decreased. The whole is enclosed in a cardboard box on end of lens, with a feeding-bottle tube attached under the inverted saucer. A slight puff through the tube, or from an india-rubber bulb, tilts the balance, and exposes the plate—the size of aperture and force of air employed deciding the length of exposure. The whole cost of the affair was threepence, the toy (an old bon-bon box), and a piece of tubing. It has done duty many months, with an occasional gluing, and will, perhaps, many more, unless some enterprising optician adopts it. In that case, I shall be happy to be come his first customer. It has several advantages over any I have yet seen: it is extremely light—no small matter to the tourist ; there is no “jar”; being so lightly balanced, the least puff of air through the tube brings it over the lens, and is then held down by a small piece of matchwood suspended over the disc that falls into a slot, and shakes the camera no more than a good-sized “ bluebottle ” would in alighting on the lens. I showed it a few days since to a very eminent photo grapher who has bought nearly every rapid shutter offered to him ; and, after carefully examining it for some time, he exclaimed, seriously, “Well I’ll be hanged! ” He has not yet, however, submitted to the operation. The “ Topic ” for next week will be “ On the Action of Light upon Bromide of Silver : A Test for Decomposition of Gelatine,” by J. Vincent Elsden, B.Sc. (Lond ), F.O.S. Gorxespondente. AN EXPERIMENT WITH GREEN WALL PAPER. DEAE Sir,—I wish to describe to you a very pleasing ex periment that I have tried during the past summer. I bad a transparency taken from a negative of a shady lane (foliage and sky). In the transparency the sky was clear and the foliage very dense. I also found a piece of green wall-paper about the size of my hand. I placed the two in a printing-frame, and exposed to the sun fora long time (several days). On removal from the frame I found the sky nearly white, and the foliage plainly marked on the wall-paper. It would have made a fair picture, only the wall-paper had two or three different shades of green in it, and small brown lines about it. It was most perfect where the dark shades were. Possibly some of your readers could tell me of a dark green colour that would fade rapidly. I have but little time to spare for photography, but think that the above might be made to give pleasing results. 1 am sorry to say I left the specimen print lying about in a little shed I use, and so lost it. If I had the opportuntiy I would try that green-faced paper I have seen hand-bills printed on.—I remain, dear sir, yours truly, C. J. Emery. SPOTS (NON-AOTINIC) ON GELATINE NEGATIVES. DEAR Sia,—Will you kindly allow me, through the medium of your columns, to enquire whether any of your readers have had a like experience to myself in respect to the above? The particulars are as follows. Having taken a quarter negative of a child, and from which a limited number of prints were required, it was not varnished. All went well until about eighteen prints ware struck off, when on looking at the next print it was covered in white spots, and presented the appearance of a snowstorm; the spots are of a yellowish-brown, perfectlv non-actinic. Now it transpires that an enlargement is required, and a considerable number of prints, and the negative, to all appearances, is ruined. Can any of your readers suggest a remedy for the spots? Perhaps someone has had the same experience, and can assist—Yours faithfully, T. W. H. [As the negative was not varnished, contact with the silver paper is quite enough to account for the spots.—Ed. P.N.] OXALATE AS AN INTENSIFIER. Sir,—1 am glad to see a verification of my letter in your journal of October 9, on “ oxalate as an intensifier,” by such an experimentalist as Mr. II. L. T. Haakman. If he realizes his idea of fixing the plate first, and develop ing afterwards, in daylight, it will be a new era in dry plate photography. I would state a few further facts—as 1 have tried several plates (since my letter in your columns was published) with uniform success. I have chiefly used old oxalate developer, mixed for weeks, and either in day light or the dark-room. Fresh oxalate worked very quickly. My first experiment was on a plate of Bennett's which I had put by as useless, being nearly a positive, after trying mercury and ammonia. This I dropped into the developing dish, in the old oxalate, and left it a few minutes, then washed well and placed it in mercury, when it rapidly whitened. I then washed, and placed it in the ammonia, getting a good printing negative, with details in shadows before invisible, and the light intensified to printing density. I enclose a print for your inspection. It is of no value except to prove my statement as to the power of the oxa late to make a positive into a printing negative. I have tried the same experiment with other plates besides Bennett’s—Nelson and others—with the same results as to intensity, both as negatives and transparencies. Mr. Haakman’s trials quite confirm all of mine, and I must have tried eight or ten plates, at least. I believe the same method will answer with collodio-bromide emulsion, from a trial or two I have made on some of the Liverpool emulsion I have had by me for five years, and which was quite good when I tried it a few weeks since. I hope that Mr. Haakman and other experimentalists will continue their trials of oxalate for this purpose, aud especially as regards the fixing and after development of negatives, and report the result in your columns.— FRANCIS W. Turton. THE PRICE OF GELATINE PLATES. Dear Sib,—As a beginner with gelatine dry plates, may I be allowed to make a few comments? I consider the dry plates much too high priced for general use. I admit the great advantages; at the same time, if you happen to make many transfers, they come very expensive. You are well aware wo can | coat and develop a half-plate picture by the wet
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