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A strip of paper is pulled out of the front of the seismograph as the box is gently shaken. |
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Paper supply roll is located at back of box. |
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This is my version. The tin can is suspended from a loop of wire that only allows it to move in one direction. A marking pen is pushed through a hole in the bottom of a can, which is then filled half way with small pebbles. The paper is pulled slowly out to the left and records the shaking of the box. |
