It’s a French curve ruler. IIRC the original French curve was used for drawing and drafting, having multiple curves and cutouts. This was developed with the graduations and solid shape specifically for sewing.
Comment on A tape measure is not accurate around curves
Diddlydee@feddit.uk 4 days ago
Why would this exist?
kindernacht@lemmy.world 4 days ago
Mickey7@lemmy.world 4 days ago
My research shows that it was originally invented to check the wild claims of those bragging that they were larger than they actually are
grte@lemmy.ca 4 days ago
Gag gift.