seism

[Gr. seismos =an earthquake.] Physics: (See Extract.) "To be consistent with a Greek basis for seismological terminology, some writers have thrown aside the familiar expre ion 'earthquake,' and substituted the awkward word ' seism .'"-J. Milne: Earthquakes , p. 9. "The coincidence of eruptions from neighboring volcanoes with extraordinary seismic convulsions." -Scrope: Volcanoes (ed. 1872), p. 7. seismic-center, seismic-focus, substant. (See extract.) "Whatever may be the real origin of the earthquake shock, it is convenient to regard its effects as proceeding from a concu ion or sudden blow delivered underground at some definite center. This center of impulse is called the seismic - focus. It must be borne in mind, however, that such a center is in nature a subterranean region, which in many cases is no doubt of very large dimensions, measuring, perhaps, some miles in diameter." -Encyc. Brit . (ed. 9th), vii. 609. IMG:content-1167.png:[graphic] seismic-vertical, s. Physics: An imaginary vertical line, joining the earth's surface and the seismic center. "Just as the seismic force is in nature, not a single point, but a considerable space, so the seismic - vertical is not a single line, but rather a succe ion of parallel lines drawn vertically from every point of the focal area to the surface." -Encyc . Brit . (ed. Ith), vii. 610. seis-mo-grăph, s. [Gr. seismos =an earthquake, and graphō -to write.] Physics: A seismometer; an instrument for recording the period, extent, and direction of each of the vibrations which constitute an earthquake. For a complete seismograph, three distinct sets of apparatus are required: (1) To record horizontal motion; (2) to record vertical motion; and gold is "sixteen to one" (q. v.), and the face value of moord time. The horizontal and vertical motions the silver dollar is therefore greater than its bullion record timeitenen horizontal rand vertical notions value. so when silver bullion is purchased and ble side by side, while at the instant at which the coined into dollars there is a profit from such coinage time is recorded a mark must be made on the diathe amount of which depends upon the price paid gram which drawn by the seismograph. He hinde applied the grifin what standing on its legs, with elevated endorsed.