The ingredients for making paper are first mixed thoroughly in machines
called “beaters” before going to the paper making machines. The
operation of beating is one of the most important in paper making.]
[Illustration: THE PAPER COMING OFF IN ROLLS.
As the paper progresses through the machines, it passes over a long
series of heated cylinders, drying and hardening the stock until it
reaches the finished end. This illustration shows a web 135 inches
wide being cut into two rolls. The air pressure in the machine room is
slightly greater than the atmospheric pressure outside, preventing dust
from entering.]
[Illustration: GREAT PAPER-MAKING MACHINES IN OPERATION