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The Alumni Journal of the College of Pharmacy - Volume 2, No. 2

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Book Excerpt: 
. . .If you wanted to copy them you had to copy them out of the light; otherwise the whole mass would get black, and that was the difficulty. In other words, the white impression could only be examined by candle or some other weak light, and they ultimately became shrouded in darkness and were lost—so we have now none of those pictures.

While they were experimenting in England, a man named Niepse, a Frenchman, was at work upon the same subject—the action of light upon various materials, but in a somewhat different direction. In 1813, or probably before that time, he discovered that certain kinds of bitumen were soluble in oil of lavender, and that when you exposed these pieces of bitumen to some light the oil of lavender would not dissolve them any more. He conceived the idea (how, is not on record), but he thought that if he could coat plates with this bitumen and then expose them to light in a camera he could get a picture upon this bitumen, a. . . Read More