r. Tucker and
Campbell produced the rotary folder which made possible the
great speed in creasing the web sheets transversely. The latter
also gave the stationary longitudinal folder and perfected the
rotary delivery of the printed sheets. Another inventor added
the sheet-turning bar by which two parts of different webs
were brought together. Later, Hoe produced the mechanical
marvel which gathered together several streams of paper and
united them into one printed product. Mergenthaler so improved
his linotype that newspaper publishers were forced by the saving
in cost of composition to adopt his machine. Then came a new
process of stereotyping, known as the "autoplate," which trans-
formed the old and laborious hand process into automatic opera^
tions. The introduction of the autoplate closed the period.
