I build that seismograph for a school project. It consist in a pipe with different holes, from 1 (the smallest) to 10 (the biggest) with a marble ball in each one. Each time you move the base of the seismograph, simulating a seism, some of the balls fall down, showing you the grade of the seism.
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| A grade 3 seism |
Do you like it? Please, comment below! ^-^
