SINGER 115 - Manual (Page 7)

The selection of thread should be based on the fabric to be stitched. The thread should
blend with the fabric in colour, fibre and size.
Silk and wool fabrics should be stitched with silk thread; cotton fabrics should be stitched
with cotton or cotton mercerised thread, etc. The thread must be of a size that will imbed
itself into the texture of the fabric. Thread that is too heavy for the fabric will remain on
the surface and become weakened by friction and abrasion when worn.
The selection of the needle should be based on both the fabric and^hread being used. The
eye of the needle must be large enough for the thread to pass freely through it. The blade
of the needle must be fine enough not to mar the fabric with too large a puncture, yet heavy
enough to pierce the fabric without binding or deflecting.
NEEDLE AND THREAD SELECTION
You will obtain best stitching results from your Sewing Machine if it is fitted with a
SINGER* Needle.