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Jointed
zig-zag presser
f,oot.
Fig.
30.
Darning
of locknir
and
stockings"
Darning
of
elastic materials
is work
where
rhe
zig_zag
seam'
with
its
elasticity, can be
used
mosr
widely. Ir
gives
smooth darning
withou
t
any
rhick
edges.
The
breadtla
of
the
seam
can
var
y
f
rom
2
to
4
mm,
according
[o
rhe
nature
Fis.
31.
Fig.
32
jointed
zig-zag presser [oot"
Fis"
3
3
'of
the
vrork,
The
f
ree
arm
fa-
cilirares rhe
work
of
sewing,
as
rhe
.gar-
ment can be
drawn
on to rhe
arm
for
example,
when
elastic
is
ro
be
sritch-
ed inside a
sleeve,
or
fo
r
rn
ending
socks
and
stockings, [rou-
sers
a[
rrhe
knee, or
or
srirching
0n
.r
pocke
c.
Casting
seams,
The
zig-zag
seam
is
ver,y
useful
when
casting
rough
edgres
dressmaking
and
other
work.
The
breadth
of
seam used rnusr depend
on
the
weighr o[
rhe
cloth
and
its
kind of
ureave. The
uhread
tension
should
be regulated
in
relation
to
the
rype
of
material.
If
the
ten-
sion
is
too tight,
it will
tend
to
make
the
edges
of
,rhe nla-
tcrial
roll.
FiS. 33
shows
how the
seam
Xooks"
Fringeirg.
V"henever
ic is
necessary"
to
prevent
troose
threads
from
unraYelling,
for
ex-
ample
when making
finges
on
tablecloths,
rable
rrrnt:j
and
scarYes,
the
ztg.-zty
seam
can
L;e
used.
Fis.
3
+.
aa
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