ent transfer impressions of
the ten colors are "stuck up," to use the technical term, and
transferred to stone in the same manner as is employed in the making
of the key-transfer. The register marks serve as a guide in "sticking
up" the separate transfer impressions and insure an accurate register
of the colors laid over each other during the process of printing. New
register marks are placed upon the key-transfer at top, bottom, and
sides similar to those on the original (which are removed from the
transfer), and these new marks now appear on all color transfers to
serve as a guide to the steam-press printer in printing his edition.
He likewise uses the hand-press proofs of the picture as a guide in
mixing his inks.

The lithographic power printing press is constructed on the same
general principle as the ordinary typographic press, excepting that it
is provided with an apparatus for moistening the stone previous to
the application of the ink rollers. The stone containing the design is
placed in the bed of the press, and the moisture, as well as the ink,
is applied by means of rollers similar to those used in the
typographic printing press. All the ten colors are now successively
printed from the transfers on a steam press, and if it is a perfect
job, the pictures can be cut to size and delivered to the publisher.

At present the cumbrous stone and the slow-moving flat-bed press are
being supplanted by the light and pliable aluminum plates and the
fast-moving rotary presses. The aluminum plate has all the requisites
for the highest grades of lithographic or surface printing, and the
rotary press is beyond doubt a vast improvement over the flat-bed
press, not only as to speed, but also as to the quality and uniformity
of its product. The mode of procedure in making transfers to aluminum
plates is much the same as that employed in making transfers to stone.
The pliability of the aluminum plate and the ease with which it can be
adjusted to a printing cylinder has resulted in the successful
introduction and use of two-and three-color lithographic rotary
presses, printing at one operation two or three colors. It has been
demonstrated that the result is fully equal to that obtained from the
single-color press, provided good judgment be used as to the
succession of the colors or printings. This marks a new epoch in the
art of lithography and enables it to compete with the typographic
three-color process, which has been maki