_Philip T. Dodge_
The Mergenthaler Linotype machine appeared in crude form about 1886.
This machine differs widely from all others in that it is adapted to
produce the type-faces for each line properly justified on the edge of a
solid slug or linotype.
These slugs, automatically produced and assembled by the machine, are
used in the same manner as other type-forms, whether for direct printing
or for electrotyping, and are remelted after use.