DRYING CYLINDERS

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types of pipes and glands. The most modern comprises the inlet pipe and the
condensed steam pipe, or outlet pipe, arranged to enter the cylinder together
through the hollow journal at the back side, so as to avoid having a pipe at
the front side. This gives more freedom in leading the paper through and in
putting on new felts. Formerly the inlet pipe entered at the front side and the
outlet pipe at the back.

Inside the cylinder it is necessary to have some arrangement for getting
rid of the water formed by the condensation of the steam. This takes the

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PlG. 80,—ADVANCEMENT OP DRYING CYUNDS1S ON A MACHINE MAONC ftME PARRS
Each cylinder is driven by a separate motor
form of a bucket or chute attached to the end of the cylinder, which scoops
up the water and raises it to the centre level, when it runs away through the
outlet pipe. A syphon pipe is oftea used, the outlet pipe being carried to the
bottom of the cylinder.
The pressure of the steam forces the water up and out. In the case of
cylinders 5 feet in diameter, at a speed of 490 feet per minute, centrifugal force
carries the water round the cylinder wall, and both these types become inopera-
tive. Each cylinder should have a separate steam trap, to prevent loss of
steam by the steam blowing straight out through die outlet pipe*
simplest steam trap is similar to a water cistern* A floating ball opens