Charting Device

A mechanical device that allows the knitter to follow a drawing indicating where shaping should occur. Knit Radar, Knit Leader, Knit Contour are brand names for this type of device.

Charting Devices had many names depending on the manufacturer and brand. Knit Leader, Knit Radar, Knit Contour.
Some devices were built right into the machine, others were separate and attached directly to the machine or attached with a cable.