Magnet Demonstrations Single Touch Method http://commons.princeton.edu/motorcycledesign/wp-content/uploads/sites/70/2018/07/SingleTouch.mp4 Double Touch Method http://commons.princeton.edu/motorcycledesign/wp-content/uploads/sites/70/2018/07/Double-Touch.mp4 The Circuit Method http://commons.princeton.edu/motorcycledesign/wp-content/uploads/sites/70/2018/07/Circuit.mp4