Présentation de l'éditeur :
It is not long since it was common to hear people say of Photography, Othere is nothing in it! It has gone as far as it can go. This was of course the popular verdict; but there were practical men too who were of opinion that little more was to be expected from it. It would be hard to find the man who would say as much today. So many advances hasP hotography made of late so important has it become as an aid to general science that it is not easy to over-estimate its claims on the attention of investigators, or to say in what direction its next conquests may not be achieved. For Photography, as its name implies (photo light, and grapho, I trace), is bound up with the theory of light, and hence with solar physics; with spectrum analysis; with chemistry; with optics; and, as we have recently seen in the discovery of the X-rays, with electricity. As to its practical application that is well-nigh without limit, extending from the record of the lineaments of a criminal to the delineation of the star-lit depths of space.
(Typographical errors above are due to OCR software and don't occur in the book.)
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