File:The Quarterly journal of the Geological Society of London (13204971914).jpg

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222 T. GRAY ON A SEISMOGRAPHTC APPARATUS.
Fig. 4. — Diagram of Continuous-motion Governor.
Magazine' Nov. 1881, p. 358) to close an electric circuit which, ac-
tuating electromagnets, causes a mark to be made on the drum 1),
and at the same time the dial of the time- keeper T to move suddenly
forward against ink-pads fixed to the ends of the hands. In this
way the hour, minute, and second at which the mark was made on
the drum D is recorded ; and this, combined with the record of the
motion which is being written on the drum, is sufficient to determine
the time at which any particularly prominent feature of the shock
took place.
The instruments just described have been made to suit the earth-
quakes which are commonly experienced in Japan, and are conse-
quently not adapted for use where the displacement of the earth is
great. A similar set of apparatus could, however, be made to record
earthquakes of considerable magnitude. The utility of having such
records of earthquakes will be readily admitted ; and I should call
special attention to the great value of the combination of the record
of the time of the occurrence with that of the motions. When the
time of occurrence of any of the chief features of the shock is known
for a number of places, it becomes a comparatively easy problem to
determine the origin of the shock and its rate of propagation. It has
been the usual practice in earthquake-observations, to take an approx-
imate measurement of the magnitude and direction of the movement
at any place and to deduce angles of emergence and direction of pro-
pagation. Now it is hardly necessary to point out that the direction
of movement at any point is very much influenced by the presence
or absence of surface undulations, and of refractions and reflections

from strata of different elastic moduli. I am of opinion that the
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Source https://www.flickr.com/photos/biodivlibrary/13204971914
Author Geological Society of London
Full title
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The Quarterly journal of the Geological Society of London.
Page ID
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36928819
Item ID
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113681 (Find related Wikimedia Commons images)
Title ID
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51125
Page numbers
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Page 222
BHL Page URL
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https://www.biodiversitylibrary.org/page/36928819
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Text
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  • The Quarterly journal of the Geological Society of London. v. 39 (1883).
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Flickr posted date
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16 March 2014
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This file comes from the Biodiversity Heritage Library.

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.

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26 August 2015

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current12:53, 26 August 2015Thumbnail for version as of 12:53, 26 August 20151,196 × 2,076 (429 KB)Fæ (talk | contribs)== {{int:filedesc}} == {{BHL | title = The Quarterly journal of the Geological Society of London. | source = http://www.flickr.com/photos/biodivlibrary/13204971914 | description = 222 T. GRAY ON A SEISMOGRAPHTC APPARATUS. <br> Fig. 4. — Diagram of Co...

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