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Did you ever heat a piece of paper before the fire until it was real hot, then lay it upon the table and rub it from end to end with your hand, and finally see it cling to the wall? Were you ever in a factory where there were large belts running rapidly over pulleys or wheels, and where large sparks would jump to your hands when held near the belts? Did you ever heat a piece of paper before the fire until it was real hot, then lay it upon the table and rub it from end to end with your hand.