The SciencesDecember 1, 1938
The Earth's Pulse
How the Scientist Goes About the Interpretation of the Wavy Lines—Signatures of Earthquakes—Recorded on the Moving Drum of the Seismograph
Stories by Rev. Joseph Lynch
The Earth's Pulse
How the Scientist Goes About the Interpretation of the Wavy Lines—Signatures of Earthquakes—Recorded on the Moving Drum of the Seismograph