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Wonders of Photography
H Garbanati, in an article on this subject in the American Journal of Photography, tells us the following:—"I was recently handed two small pieces of glass, in the center of each was a dark object, about a quarter of an inch square In the center of the square of one of these, by dint of close and painful examination, I discovered a speck about one-sixteenth of an inch diameter, which, bore somewhat the re-semblance to a portrait of a head In the other was also a speck about one-eighth of an inch, and some other very minute specks in the one speck, but which I could not recognize as any particular objects. By holding the first piece of glass up to the light, and looking through a powerful magnifier, I discovered a perfect portrait of about a sixth size, and in the other a group of five equally perfect, of about half size. To what use might not this mode of photographing be put ? In war the most elaborate instructions might be carried in a button or head of a pencil-case ; and the general or secretary of was needs but a magnifying glass to save the use of spies and men from hanging. The whole archives of a nation might be packed away in a snuff-box. Had the art been known in the time of Omar, the destruction of the Alexandrian library would not have been a final loss."
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