Mary needed a specialized “quilting ruler” for the triangles in a quilt she’s making:
The wide slot fits around the “ruler foot” on the sewing machine, with the ruler gripping and guiding the fabric across the machine table:
The design consists of circles and offset lines around a pair of tool-layer construction lines at 45°:
The name is mirror-imaged because the engraved lines are on the bottom of the ruler to eliminate parallax against the quilt.
Edit: Some pencil guide buttons to draw the needle path:
More details on my blog at:
