Of course, for a screw thread to do any work, it has to project out more than the thickness of a piece of paper, and the shape of the projection determines the mechanical properties of the screw.

In a diagram, they showed that they experimented with three gap sizes as they weaved thread into a piece of fabric. “To create extra space for separation and enhance triboelectric output ...

Equipment: A 3kg spherical weight with hooks on the top and bottom, two pieces of thread, a rigid frame, an aluminum rod and a piece of heavy-duty string used as a safety line. What it does: A weight ...