A dictionary of photography for the amateur and professional photographer (1889)
Wall, E. J. (Edward John), 1860-1928 · New York : E. & H.T. Anthony · leaf 111
DICTIONARY OF PHOTOGRAPHY. IOI concave, and the divergent action of such prisms or lens upon the rays of light. It is obvious that by combining the two lenses the convergent or positive action of the one may be counteracted by the divergent … Fig. 3. or negative action of the other. It is upon these principles that the whole of the modern lenses are calculated. As soon as it was announced in 1839 Dv Daguerre and Fox Talbot that they had been enabled to obtain a comparatively permanent image in the camera obscura, the ability and skill…
Photography
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![An illustration from St. Nicholas [serial] (1873)](https://img.insideoutlibrary.com/img/200/ia-stnicholasserial321dodg-359-448.webp)
