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Easy to make Slide ruler for iPad.
Works with the free Line and Ink apps from Adobe.

Step 1: Supplies Needed

Conductive foam (Found at electronics or computer stores)

4 inch metal screw or rode.

Step 2:

  1. Cut the conductive foam into 2 pieces of 3/4" (20mm) square and 1/2" (12mm) thick
  2. Pierce a hole in the middle of the 2 pieces of foam.
  3. Thread the 2 pieces on the screw, 1 piece all the way through and the other just at the end.
  4. Download the free Line or Sketch by Adobe from the app store and start drawing with your new digital ruler.
  5. Have fun.

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