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seismogram; paper chart output from Gray-Milne seismograph, showing 3 components of ground movement from Tokyo earthquake of September 5th, 1887

Annotaded in black ink "Part of the Record of an Earthquake Recorded by the Gray-Milne Seismograph in the Meteorological Observatory Tokio Japan September 5th 1887"
MANU MILNE,John,Professor [6.23GMT.5.9.1887] Meteorological Observatory,Tokyo, Japan, A very early example of graphical output displaying earthquake motion. The trace covers about 3 minutes of activity. Professor John Milne and Thomas Gray invented the first modern seismographs, while working in Japan,