CONTENTS. 



CHAPTER I. 



INTKODUCTION, 



PAGT8 



Relationship of man to nature — The aspect of a country is de- 

 pendent on geological phenomena — Earthquakes an important 

 geological phenomenon— Relationship of seismology to the 

 sciences and arts — Earth movements other than earthquakes — 

 Seismological literature — (Writings of Perrey, Mallet, Eastern 

 writings, the Philosophical Transactions of the Royal Society, 

 the ' Gentleman's Magazine,' the Bible, Herodotus, Pliny, Hop- 

 kins, Von Hoff, Humboldt, Schmidt, Seebach, Lasaulx, Fuchs, 

 Palmieid, Bertelli, Seismological Society of Japan) — Seismo- 

 logical terminology ....•..-.. 1 



CHAPTER II. 



SEISMOMETEY. 



Nature of earthquake vibrations — Many instruments called seismo- 

 meters only seismoscopes — Eastern seismoscopes, columns, pro- 

 jection seismometers-^ Vessels filled with liquid — Palmieri's 

 mercury tubes — The ship seismoscope — The cacciatore — Pendu- 

 lum instruments of Kreil, Wagner, Ewing, and Gray — Bracket 

 seismographs — West's parallel motion instrument — Gray's con- 

 ical pendulums, rolling spheres, and cylinders — Verbeck's ball 

 and plate seismograph — The principle of Perry and Ayrton — 

 Vertical motion instruments — Record receiver — Time- recording 

 apparatus — The Gray and Milne seismograph . . . . 12 



