1910–1911
Britannica 11th
Encyclopaedia Britannica · 11th edition
SUN COPYING, or PHOTO COPYING, the name given to that branch of photographic contact printing which is carried out without the aid of a camera-made negative. It is now used very extensively for copying documents, especially the plans of architects and engineers. The earliest discovered process, the ferroprussiate, is still the one most largely used, on account of its economy and permanence, combined with a simplicity of manipulation that renders it highly suitable for office use; it was invented in 1840 by Sir John…
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- Vol. 26, pp. 93-93