SECOND PERIOD.
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| L. J. M. DAGUERRE. Used Iodine, 1839. | JOHN FREDERICK GODDARD. Applied Bromine, 1840. |
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| NEW YORK. Copy of Instantaneous Daguerreotype, 1854. | |
SECOND PERIOD.
PUBLICITY AND PROGRESS.
1839 has generally been accepted as the year of the birth of Practical Photography, but that may now be considered an error. It was, however, the Year of Publicity, and the progress that followed with such marvellous rapidity may be freely received as an adversely eloquent comment on the principles of secrecy and restriction, in any art or science, like photography, which requires the varied suggestions of numerous minds and many years of experiment in different directions before it can be brought to a state of workable certainty and artistic and commercial applicability. Had Reade concealed his success and the nature of his accelerator, Talbot might have been bungling on with modifications of the experiments of Wedgwood and Davy to this day; and had Daguerre not sold the secret of his iodine vapour as a sensitiser, and his accidentally discovered property of mercury as a developer, he might never have got beyond the vapoury images he produced. As it was, Daguerre did little or nothing to improve his process and make it yield the extremely vigorous and beautiful results it did in after years. As in Mr. Reade’s case with the Calotype process, Daguerre threw the ball and others caught it. Daguerre’s advertised improvements of his process were lamentable failures and roundabout ways to obtain sensitive amalgams—exceedingly ingenious, but excessively bungling and impractical. To make the plates more sensitive to light, and, as Daguerre said, obtain pictures of objects in motion and animated scenes, he suggested that the silver plate should first be cleaned and polished in the usual way, then to deposit successively layers of mercury, and gold, and platinum. But the process was so tedious, unworkable, and unsatisfactory, no one ever attempted to employ it either commercially or scientifically. In publishing his first process, with its working details, Daguerre appears to have surrendered all that he knew, and to have been incapable of carrying his discovery to a higher degree of advancement. Without Mr. Goddard’s bromine accelerator and M. Fizeau’s chloride of gold fixer and invigorator, the Daguerreotype would never have been either a commercial success or a permanent production.
1840 was almost as important a period in the annals of photography as the year of its enunciation, and to the two valuable improvements and one interesting importation, the Daguerreotype process was indebted for its success all over the world; and photography, even as it is practised now, is probably indebted for its present state of advancement to Mr. John Frederick Goddard, who applied bromine, as an accelerator, to the Daguerreotype process this year. In the early part of the Daguerreotype period it was so insensitive there was very little prospect of being able to take portraits with it through a lens. To meet this difficulty Mr. Wolcott, an American optician, constructed a reflecting camera and brought it to London. It was an ingenious contrivance, but did not fully answer the expectations of the inventor. It certainly did not require such a long exposure with this camera as when the rays from the image or sitter passed through a lens; but, as the sensitised plate was placed between the sitter and the reflector, the picture was necessarily small, and neither very sharp nor satisfactory. This was a mechanical contrivance to shorten the time of exposure, which partially succeeded, but it was chemistry, and not mechanics, that effected the desirable result. Both Mr. Goddard and M. Antoine F. J. Claudet, of London, employed chlorine as a means of increasing the sensitiveness of the iodised silver plate, but it was not sufficiently accelerative to meet the requirements of the Daguerreotype process. Subsequently Mr. Goddard discovered that the vapour of bromine, added to that of iodine, imparted an extraordinary degree of sensitiveness to the prepared plate, and reduced the time of sitting from minutes to seconds. The addition of the fumes of bromine to those of iodine formed a compound of bromo-iodide of silver on the surface of the Daguerreotype plate, and not only increased the sensitiveness, but added to the strength and beauty of the resulting picture, and M. Fizeau’s method of precipitating a film of gold over the whole surface of the plate still further increased the brilliancy of the picture and ensured its permanency. I have many Daguerreotypes in my possession now that were made over forty years ago, and they are as brilliant and perfect as they were on the day they were taken. I fear no one can say the same for any of Fox Talbot’s early prints, or even more recent examples of silver printing.