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The photographic news
- Bandzählung
- 6.1862
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- 1862
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- Bandzählung
- No. 181, February 21, 1862
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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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362. FEB. 21,1862.] THE PHOTOGRAPHIC NEWS. group is scarcely printed enough, and the le side has spoiled it by moving; that was THE ALKALINE RAPID PROCESS. Sm, As far as my limited opportunities have yet enabled uce ot expi with a glass room. am, sir, &c., W. F. Watson. Pinan, France, February, 1862. Hue print received is entirely free from mealiness.—Ed.] PORTRAITS IN THE OPEN AIR. . Sm,—With all deference to the opinion of such an autho- nity on photography as the Abbe Despratz, I think he has made a slight mistake in one or two statements, as con- ; tained in last week’s News. The first is that “ a good por- trait can never be taken in the open airof course I am not in a position to judge what the Abbe might call a good picture. 1 can only say that my practice has been a good deal in that way. and I never remember being troubled with the “ spotty ” effect mentioned. I never find any difficulty in getting pictures of fair quality. I enclose a portrait taken nearly two years ago, in which there is plenty of half tone, and two groups. The negative of the single figure has been scratched somehow, but it will serve to show that at any rate half-tone may be found in pictures taken out of doors. It was taken on a bright day; the sun being at the time obscured by a cloud, and the exposure was, as near as 1 can remember, two seconds. This brings me to the e, and ion. I lain, 1 lorides io that tion of atience iention 1 given 1. L. L with re fact. IkalM ss first nequsl ris ud : sond® sugget on us evelop t is to I have nly by bscribe tain, il if saf t parts ws tha* redu 1 r, m ' n ; let I Manon’s “ extra albumenized ” paper, and that I excite by floating for five minutes on an eighty grain silver bath. 1 send you a print from a calotype negative of a street in Pinan, as a fair sample of the results of the above process 1 am not chemist enough to say whether the absence of mealiness is due to the use of phosphate, instead of carbo-, nate of soda, or whether it should, in more justice, be attri buted to the manner in which the albumenized paper is prepared, that 1 leave for others to determine; but accord ing to your opinion of the merits of the result it rests with you to recommend it or not to your numerous readers.— SS al" I “Y. 1 1nu5• e-l —dhe --e UlOb UI —J —dJ "-e1 Ullb, wnC" aboe ther the sun be too bright or the reverse : and if I cannot if yo produce pictures up to the standard referred to, I must be mnal • content. I must apologize for occupying so much of your It v space in this matter, and beg to subscribe myself, yours irse « fespectfully, T. Jones. rapl llroa ' 1 Street ' Ludlow ’ Feb - 12, 1862. tselfi PS.— The one group is scarcely printed enough, and the one figure on the side has spoiled it by moving; that was it! SPosed with a side light ten or twelve seconds. S [We conceive the Abbe is in error. Great skill and judg- Was ment are required in open-air portraiture; but it is possible, WSf " e know, to produce excellent portraits without a glass Pog "om. Indeed your specimens prove it.—Ed.] bsere — . . . - 11 thes second point in dispute, viz., the difference of exposure re- stronl quired in the open air in comparison -ith • c loqoub My conclusion is, that under the same circumstances, it our t would be four or five times as great, that is, about ten iust j seconds I I always find on a bright day, in the shade, that e batb two seconds, and in summer one second, is ample; in fact, I took a picture as nearly instantaneous as could be, by removing j and replacing the cap, on a cold dull day last month. It I may be well for amateurs and experimental photographers Raputo wait for certain effect of cloud, &c.; but for one like ju gh I myself who depends upon it for a living, it would hardly ss’aol pay. I must e’en make the best of my day when out, whe- topi® ild o% nde me t * IC ae **-v-u -¥FVuo-C-J-uvuavIU If so sues test the merits of Mr. Bartholomew’s very valuable ris V cansstion, of the use of so ^ a in dry plate photography, I if pio tivenPeak most satisfactorily of its results. With a sensi- erati® (he >ict ln the camera, almost equal to that of wet collodion, ' i the k S have a density, detail, and cleanliness, especially til 1 • kies, more uniformly certain, than from any other neol^ 41 3 Process I have ever tried, although I very much prefer ’ wat ' eatine one of Dr. II. Norris. I attribute the entire nces 1 8Ucc188 of this method to the alkaline, in opposition to the teen ru acid reaction of the sensitizing agent, nitrate of silver, trad 'ill as acids retard, may not therefore alkalics excite, or at et t alw cv ents ; not retard ? The presence of organic matter it I o "a!8 exists in every photographic process of the present day, whether negative or positive, for without it, no decom position of nitrate of silver by light alone is effected, the pyroxyline in one case, and the paper and albumen in the other, being always present. No common amount of simple washing will entirely remove all the nitrate of silver from the sensitized collodion film, but for the good keeping qualities of dry plates, it is necessary to reduce the quantity' of it to a minimum. Is the fogging evil of wet collodion films, in an alkaline sensitizing bath, owing to their extreme sensitiveness, and if so, might it not be turned to good ac count in instantaneous photography ? Might not an alka line sensitizing bath be always used for dry plates, so that no after use of soda would be necessary, but simply washing them well before gelatinizing and drying, &c. ? Is this the secret of Dr. H. Norris’s very sensitive dry plates ‘I 1 have found the best method of applying the soda solution to be afier the first washing, and before the second or last, so as to remove it entirely before pouring on the warm gelatine so lution ; for if any combination takes place between the soda and the gelatine, certain slight markings, of a cellular or reticular form, fatal to good negatives, are the result. I am very truly yours, &c., E. T. Coldstream, N. B., February 12, 1862. THE DRY PROCESS WITHOUT PRESERVATIVE. Sib,—I do not quite understand the object of Mr. Ward’s communication in your last, but if it be to impugn my good faith I must refer him to the article in question, which, from its very title, is descriptive of a dry process “ without preservative.” 1 there state that “ no preservative substances whatever aro re- quired; good pictures can be got without them.” If the film be excited in the ordinary way, well washed and dried, it will be found as sensitive as the best of any other dry process.” I simply stated-that I had found it necessary to keep the film on the plate by some means, either by varnishing the edge of the plate, or covering the surface with gelatine or albumen. I preferred albumen chiefly because of its easy preparation, and also because I had been in the habit of using it as a substratum in the wet process. Having been told that my pictures were all due to the albu men, and further that the albumen would spoil the bath, I pro duced a picture without the albumen, and showed a sample of the bath, giving also the results of my experience of its use, as I have just stated, namely, as a substratum for wet collodion for a long period of time. The “ hundreds ” of plates were not stated by me to have been prepared for drying, but they were used while wet. If you will refer to No. 153 of the British Journal of Photo-, graphy, you will find a letter of mine in relation to the resin process of Mr. Glover, in which I indicate the result at which I was then arriving. My words were, “ I strongly suspect that no preservative is required at all.” This letter dated October 15th, 1861. I would simply observe, once for all, that the paper read by Mr. Martin was hurriedly prepared at his request, but if I had imagined that it would have raised so much controversy it is very probable that I might have taken more pains with it. I find that there are persons who, oddly enough, seem to ignore the facts altogether, as though “vested interests ” were disturbed by not using “ preservative ” substances, but I have to thank you for bringing the subject prominently forward, and if amateurs are enabled to obtain pictures with more care and certainty my object will have been gained without contending who was first in the field, which must really be a matter of perfect indifference to your readers. I have had several collodions sent me for trial, but I have not yet found one to my mind. The article wanted is a collo dion which will not leave the plate during the fixing of the pic tures, and will give vigorous results with a moderate exposure. If any of your correspondents can help me in this respect, I shall feel greatly obliged.—I am, yours obediently, W. Hislop. [If our readers refer to the last paragraph of Mr. Hislop’s paper, read at the North London meeting in November (p. 579, Vol. V, Photogbaphic News), they will find he dis tinctly states that he claims nothing new. He simply empha sized an old idea which had never received due recognition, and in so doing has initiated or rather revived experiment in the right direction. We believe a suitable collodion is the only
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