Printing and writing materials: their evolution by Smith Adele Millicent

Author:Smith, Adele Millicent
Language: eng
Format: epub, pdf
Tags: Writing, Printing, Paper industry, Bookbinding
Publisher: Philadelphia, The author
Published: 1912-03-25T05:00:00+00:00

112 STEREOTYPING AND ELECTROTYPING

Any defects or indentations on the face of the plate are hammered up from the back, and it is afterwards passed through machines which finish it and give it a bevel on the side. When mounted it is ready for the press. A plate to be used on a Hoe web-perfecting press, is given a curvature to fit it to the cylinder. When red ink is used, electrotypes are usually given a coating of nickel, to protect the copper from the action of the mercury.

An electrotype plate will stand from five hundred to six hundred thousand impressions. A stereotype plate lasts for only about one hundred thousand impressions. Both stereotype and electrotype plates are now sometimes made as large as two pages of a newspaper.

By hurrying each step of the process, it is possible to make an electrotype plate in an hour; but for a high grade of work more care is taken, and it then requires several hours to produce a plate with fine finish.

Electrotyping is a much cheaper process than either half-tone or line work, the price being from one to three cents a square inch. Line work costs about seven cents, and half-tones from twelve to fifteen cents a square inch.

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