White 1927 Instruction Book page 26

Applications of Straight
Stitch
A. Seams
The normal stitch length for most
fabrics is 3, but the length chosen
should depend on the fabric and
area of usage. Usually, heavier
fabrics require longer stitches, and
lighter weight fabrics
require
shorter stitches. For curved seams
and bias cut areas use a shorter
stitch length to add strength and
elasticity to the seam.
B. Basting/Topstitching
Sewing a seam with a longer
stitch is useful for temporary
seams prior to fitting. Basting
stitches also may be used when
gathering in fullness. Topstitching
can be done very effectively with
the long straight stitch. For a
bolder stitch,
two threads of the
same type can be threaded through
one needle (size 14 or 16). A
heavier thread such as buttonhole
twist may be used fortopstitching,
but be sure to use a larger needle
(size 16 or 18). Basling instructions
in glossary.
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