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Scientific American, Vol. 37, No. 25 (1877) (1877)

leaf 3

An illustration from Scientific American, Vol. 37, No. 25 (1877), 1877, leaf 3
subjected to etc., of pen lines. It isusual the rapid and comparatively to make the drawing some- careless manipulation inci- what larger than the engrav- dent to the use of the fast ing is to be, in order that by newspaper press. It may be the reduction the lines of the stated, however, that… … extent. This gelatin-surface then movements of camera and object. becomes the matrix from which, Should one or the other move even through intermediate steps, the final plate for printing is|the insoluble portions, so that the lines are rendered|the merest fraction of an inch—and this might easily…

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