half tone

Illustrated with a map, 14 full-page and 46 text drawings in half-tone by Howard V. Brown.

Illustrated with a map, 16 full-page and 71 text drawings in half-tone by Howard V. Brown.

Illustrated with 27 full-page and 87 text drawings in half-tone by Howard V. Brown.

The old-fashioned "wet-plate" photography is used in making practically all process plates, either in line or half-tone.

To make a half-tone plate of a photograph or other subject, it is necessary to break the negative up into lines and dots.