Long and narrow chases
294
punches, and this number should be repeated on the chase in the place where it meets the bar. Under no circumstances should the bar be put in
any other
when
place, for a chase is
the bar
is
permanently injured forced into a slot for which it was
not originally fitted. Bars taken out of a chase should be dried, cleaned, oiled, and put away in a place where the edges of the dovetails will not be hacked or bruised. Carefully treated, they will do
good
service for
more than a
lifetime.
Screw-chases are sometimes provided for small Two sides are pierced for screws which presses. press against the stout iron bar that forces the type The object sought is the locking up of a tight. large
form
side-sticks
which quoins and The small screw-chase
in a small chase, for
cannot be used.
not in favor uneven pressure of the screw will twist the type off its feet, and the screws often Another form of rust and become immovable. is
;
screw-chase
is
made
for locking
up the forms
of
daily newspapers.
Long and narrow chases are supplied for headings and
bill
-heads.
They
are sometimes used on
the beds of printing-machines as a better substitute for
many Pieces
of
wood furniture, which has a to bow or spring upward on always tendency the bed, often to the damage of the machinery.