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Abstract
A series of experiments designed to give information concerning the changes in dot size that occur in letterpress printing during the sequence negative-powderless etched plate-final print on paper, are described. Graphs showing the relation between the percentage printing area on the plate and the percentage printing area on the negative are given. The graphs obtained by plotting the optical densities of the prints against the optical densities of the negatives in the case of letterpress and lithographic printing are compared.