The process for sewing a bar tack is essentially to sew several long, narrowly-spaced stitches along the line of the bar that will be formed, followed by short stitches made perpendicular to the long stitches, through the fabric and over the bar.
The procedure for attaching a bar tack involves sewing multiple lengthy, closely-spaced stitches along the line of the bar that will be created, followed by brief stitches made at right angles to the lengthy stitches, through the fabric and over the bar.