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The photographic news
- Bandzählung
- 13.1869
- Erscheinungsdatum
- 1869
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- Englisch
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- Hochschule für Grafik und Buchkunst Leipzig
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- Bandzählung
- No. 541, January 15, 1869
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Zeitschrift
The photographic news
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Band 13.1869
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- Register Index To Volume XIII 629
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Band 13.1869
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28 THE PHOTOGRAPHIC NEWS. [January 15, 1869. pleasant to use of any which has been presented to the public. In the ordinary forms of stereoscope considerable ingenuity has been expended to construct a clumsy, heavy arrangement, to secure the least efficiency at the most cost. To begin with, it is a consideration of vital import ance, in examining a stereoscopic slide, that it should have plenty of light upon it. In the ordinary box-stereoscope this is skilfully provided against, care being taken that light shall only reach the slide through one aperture, which shall be difficult to present towards the light when the instrument is used by lamp-light—the most common time for such examination. As the focus of the eye differs very much in different persons, a ready facility of varying the dis tance of the slide from the lenses is important; and therefore a large number of stereoscopes are made without any adjust ment for varying the focus at all; and others permit of ad justment not exceeding an inch, when a range of 4 or 5 inches is at times necessary. One of the essential conditions of pleasant vision in astercoscope consists in the perfect shading of the eyes from all light except that which is reflected from the slide itself; and such a shade is provided very rarely indeed in the ordinary instruments. We might go on pointing out the studied inconvenience which seems to distinguish the old instruments, but it is unnecessary. Suffice it to say, that almost every possible inconvenience has been eliminated from the stereoscope which Mr. Blanchard brought before the South London Society and Mr. Meagher has now intro duced to the English public. It is pre-eminently efficient and convenient in use, and it is light, simple, and cheap. As the slide is open to light all round, there is no difficulty on that score : and no risk of half the picture being kept in shadow by the sides of the box. It possesses a simple sliding adjustment giving a range of focus of from 5 to 10 inches. The importance of this is easily illustrated. For our own most convenient use the slide is required close up, to bring it within the 5-inch focus, whilst many of our friends require it at a distance of 8 or 9 inches. A shade fitting to the forehead and nose completely excludes light from the eyes, except that coming from the slide and passing through the lens. This shade renders the instru ment just as suitable for transparencies as for paper slides. A convenient handle is attached, or, in some cases, the in strument is affixed to a stand with all desirable adjust ments. One before us is of polished walnut, and forms a handsome addition to a drawing-room table ; made in plain mahogany, less ornamental but equally efficient, we believe this is the cheapest stereoscope which can be obtained. It will give this instrument a considerably increased interest in the eyes of most readers when we state that it is the invention of Dr. Oliver Wendell Holmes, whose works take a high position in the first rank of American litera ture, and whom we feel proud to recognize as a fellow labourer in photographic progress. The last number of the Philadelphia Photographer gives some amusing facts in the history of this instrument. Mr. Blanchard, in introducing it to the South London meeting, was somewhat severe on the disposition prevalent in this country to run in grooves, and the lack of enterprise in failing to appreciate or under take improvements. It is not a little amusing to find that amongst our ingenious and enterprising American cousins, Dr. Holmes had just the same difficulties to combat which Mr. Blanchard reprehended as essentially belonging to his own countrymen. Although this instrument has so recently come under attention in this country, it appears that it was invented by Dr. Holmes seven or eight years ago, and referred to in an admirable article on “ Sun Painting and Sun Sculp ture,” published in 1851.* We append here a few para graphs from the recent article in our Philadelphia contemporary. This simple stereoscope was not constructed by accident, but was the carrying- out of a pl m to reduce the instrument to its simplest terms. Two lenses were necessary, and a frame to hold them. I * See PuorognApIIC News, Vol. V., page 365. procured two of the best quality, and cut a square frame for them out of a solid piece of wood. A strip of wood at right angles to this was required to hold the pictures. I shaped one, narrow in the middle, broad at both ends—at one end to support the lenses, at the other to hold the stereographs, which were inserted in slots cut with a saw at different distances. A partition was necessary, which I made short, but wedge-shaped, widening as it receded from the eye. A handle was indispensable, and I made a small bradawl answer the purpose, taking care that it was placed so far back as to give the proper balance to the instrument—a point which bungling imitators have often overlooked. A hood for the eyes was needed for comfort, at least, and I fitted one, cut out of pasteboard, to my own forehead. This primeval machine, parent of the multitudes 1 see all around me, is in my left hand as I write, and I have just tried it and found it excellent. I felt sure this was decidedly better than the boxes commonly sold—that it was far casier to manage, especially with regard to light, and could be made much cheaper than the old-fashioned con trivances. I believed that it would add much to the comfort and pleasure of the lover of stereoscopic pictures. I believed, also, that money could bo made out of it; but, considering it as a quasi-scien- tifle improvement, I wished no pecuniary profit from it, and refused to make any arrangement by which I should bo a gainer. All I asked was, to give it to somebody who would manufacture it for sale to the public. There did not seem to bo much chance of anybody’s making a fortune by it, at first, certainly. I showed it to one or two dealers in Boston, offering them the right to make all they could by manu facturing the pattern, asking nothing—not even one for my own use. They looked at the homely mechanism as a bachelor looks on the basket left at his door with an unendorsed infant crying in it. “ No prophet is accepted in his own country," I said, with pious resignation. “ Let us try our very good friends, the noted opticians of Chestnut Street, Philadelphia." So, on my next visit to that city, I showed my pattern there, and offered it freely and without price ; but they looked at it as if they were bachelors too, and this was the twin of the other baby on their doorstep. I had received many polite attentions from members of a great photographic house in Broadway, New York, and as I was returning through that city I thought it would only be fair to offer them a chance to repeople the world with my improved breed of stereoscopes. Nothing could bo more polite than the way in which they treated me, but I might as well have offered my stereoscope to an under taker for a smile of welcome as to these great dealers, generous and excellent people as they are. Not far from their establishment was another of some pretensions, at which I made one last trial. On entering the salesroom, ! saw a young gentleman smoking a cigar with such evident enjoyment that I felt quite ashamed of myself for interrupting him on a mere matter of business. I bought a picture or two of him, however, and then brought put my stereoscope and began, in a modest way, to explain its advantages and its commercial possibilities. It was to a young Briton I found that I was addressing myself, and my answer was somewhat to this effect:— “ Beg your pawdon ?— Aw—Yes. Quite so. They send us out everything new from London—lastdodges—and all that sortof thing, you know.” Of course I ought to have remembered that in London they know all that we wretched provincials know, and ever so much more. So I left him over his cigar and his last London importations, which had, of course, all the possible improvements which the wit of man can devise. Finally, Mr. Joseph Bates, who had made one for Dr. Holmes, commenced the manufacture, and the instrument has graduully been superseding all others in America, as it probably will in this country. Dr. Holmes and Mr. Bates have made various improvements at times, of which the public have had the advantage. In the recent article, Dr. Holmes refers to another improvement, permitting the reflection of a Claude Lorraine light on to the slide. We hope to learn more of this improvement, which we shall, in due time, describe to our readers. CALOTYPE PROCESS. BY A. G. anEENLw (COLONEL, INDIAN STArr CORPS).* In none of the many works on photography have I been able to discover a very easy and sure mode of obtaining * We learn from Col. Greenlaw that the following method of working the calotype process, which could not be surpassed for simplicity, is found per fectly efficient in the climate of India, where photographic difficulties are much greater than they are in this country. We had hoped to try the pro cess before publication, so as to have been able to express an opinion i regard to fit; but the long prevalence of unphotographic weather ha rendered a fair trial impossible, and we delay it until the spring is a Uw? advanced. The 18 by 16 pictures of Col. Greenlaw, by this process, too" he first prize at a recent Madras exhibition.—Ed.
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