Triumphs and wonders of the 19th century, the true mirror of a phenomenal era, a volume of original, entertaining and instructive historic and descriptive writings, showing the many and marvellous achievements which distinguish an hundred years of material, intellectual, social and moral progress .. (1899)
Boyd, James Penny, 1836-1910 · Philadelphia, Pa., A. J. Holman & Co · leaf 220
y is that metallic salts, sensi-tive to the light, when in contact withorganic matter, suffer a complete orpartial reduction and are rendered in- louis jacques daguekre soluble. The intensity of the reduc-tion is measured exactly by the intensity of the light. When light isreflected from any object… … 204 TRIUMPHS AND WONDERS OF THE XIX™ CENTURY reflection. Thus, when the unreduced metallic salt is washed out, a perma-nent record, the negative, of the object is left. It is a long step from the first daguerreotype to the modern photograph,but the principle of the process has remained unchanged.…
Progress · Inventions
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