THE MAKING OF A HALF-TONE ENGRAVING. MODIFICATION OF THE DOT BY DIAPHRAGMS. DIAGRAM SHOWING THE RELATIVE POSITION OF PLATE SCREEN AND COPY. Etching. Poliehing. Developing. Burning in., scientific american, 1900-09-08


THE MAKING OF A HALF-TONE ENGRAVING. MODIFICATION OF THE DOT BY DIAPHRAGMS. DIAGRAM SHOWING THE RELATIVE POSITION OF PLATE SCREEN AND COPY. Etching. Poliehing. Developing. Burning in., scientific american, 1900-09-08


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