Hannah Perner-Wilson writes about her embroidered potentiometers: Made using the zig-zag stitch on the sewing machine to sew/embroider a conductive and a resistive trace side by side. Then any conductive object can be used to bridge the contact between the traces and measure the position/distance from measuring point through the change in resistance.
Syuzi Pakhchyan describes this method in her book Fashioning Technology, by example of a linear slider potentiometer using a magnet to keep the conductive wiper finger in place.
For the original writeup see Hanna's website: http://www.kobakant.at/DIY/?p=2331
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