These manuals are scans taken from original Singer manuals that have been converted to Adobe PDF format for viewing/printing. Some of the original manuals are nearly 100 pages and the resulting files can be rather large, even when compressed into PDFs.
If you will right-click the links below and choose "save as" you can store these files on your own system. This is usually better than trying to view them within your browser.
Machines:
127 & 128 (2.7 MB)
15-91 (5.3 MB)
201 (6.2 MB)
221K (1.1 MB)
301 (5.7 MB)
404 (3.8 MB)
431 (7.9 MB)
503 (9.1 MB)
Accessories:
Blind Stitch Attachment (20 MB)
Needle Threader (153 K)
Flat-Work Darner (1.2 MB)
Even-Feed / Walking Foot (7.2 MB) (In two languages!)
Oldstyle Buttonholer (1.2 MB)
Lowshank Buttonholer (2.3 MB)
Professional Buttonholer (4.4 MB)
Zig-Zagger (4.2 MB)
You will need Adobe Reader to view or print these files. You can download it here.