314
Equality ofpressure of importance
In this diagram the outer black line represents the outline of a page before locking the inner dotted ;
the same page after locking up. The distance between these lines indi-
line,
cates approximately " " or
the
give compressibility of the type, which, in a long page of leaded type,
usually greater from the head to the foot than from is
side to side.
The
types in the corner
but
slightly
single are
A
moved by
locking up, but those in the corner
C
moved much more, and in a toward that corner A. To lock up
will be
diagonal line properly, the pressure applied to the type must be gradual and even on each side. When the pressure is not even and gradual, one page or one quarter will
hang or
the form are
put on the
If the
crook.
made
side, the
quoins at the foot of
full tight before
any pressure is types will give in that direction
have been made needlessly much too tight by pressure at the foot, twice as much force must be exerted to move them in the only.
If the types
contrary direction.
Under
this
unnecessary pres-
bow upward or hang in one quarter, the cross-bars may be twisted, or the chase may be strained or cracked. In every form too tightly locked up the types are sure to bow upward sure, the types will
j