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Diagrammatic representation of the propagation of the earthquake waves and their record by the seismograph in different parts of the earth.

Earthquake Waves

Diagrammatic representation of the propagation of the earthquake waves and their record by the seismograph…

Diagrammatic view, from above, of a seismograph.

Seismograph

Diagrammatic view, from above, of a seismograph.

The Ewing seismograph, constructed to record all three movements. Three pendulums are arranged to swing in the manner of a bracket or a gate, in three planes, at right angles to one another. Two of them are placed vertically and oscillate in a horizontal manner.

The Ewing Seismograph

The Ewing seismograph, constructed to record all three movements. Three pendulums are arranged to swing…

"Seismoscope. a, heavy mass supported by loop at point near center of gravity; b, point on which upper side of loop rests; c, long needle projecting from upper side of loop; d, conducting-wire; e, binding-post; f, long arm of lever pivoted at k; g, point where end of lever rests on end of needle; h, mercury-cup." -Whitney, 1911

Seismoscope

"Seismoscope. a, heavy mass supported by loop at point near center of gravity; b, point on which upper…