Different types of recorded seismograms:
a) ink recordings of the 1894 earthquake;
b) a detail of a recording on smoked paper;
c) a detail of a recording on photographic paper.
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| Figure 2 Different types of recorded seismograms: a) ink recordings of the 1894 earthquake; b) a detail of a recording on smoked paper; c) a detail of a recording on photographic paper. |