File:The Quarterly journal of the Geological Society of London (13204793153).jpg

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T. GRAY ON A SEISMOGRAPRTC APPARATUS.
219
The instrument is suited for recording motions of the earth which
are under one centimetre on either side of its normal position, while
the period of oscillation is less than one second. The instrument
may be adjusted to register motions having a longer period ; but it
is not expected to be called upon to do so. The actual motion of
the earth is to be derived from a record of three separate components
of the motion — two horizontal and at right angles to each other, and
the other vertical. The horizontal components are recorded by a
pair of conical pendulum-seismographs (see Phil. Mag. Sept. 1881),
one of which is shown at P, figs. 1 & 2. These instruments are con-
siderably simpler in form, and can be more readily adjusted, than the
instruments described in the paper above referred to. They consist
Fig; 2. — Diagram of Pendulum- Seismograph recording horizontal
movements.
of cylinders of lead, P, supported from their centre of gravity by means
of a strong silk thread, which is suspended from a point which can be

moved by a simple screw arrangement in either direction, horizontally
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Source https://www.flickr.com/photos/biodivlibrary/13204793153
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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36928816
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 219
BHL Page URL
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https://www.biodiversitylibrary.org/page/36928816
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Text
Flickr sets
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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
Credit
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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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This image was originally posted to Flickr by BioDivLibrary at https://flickr.com/photos/61021753@N02/13204793153. It was reviewed on 26 August 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

26 August 2015

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current12:54, 26 August 2015Thumbnail for version as of 12:54, 26 August 20151,196 × 2,076 (348 KB)Fæ (talk | contribs)== {{int:filedesc}} == {{BHL | title = The Quarterly journal of the Geological Society of London. | source = http://www.flickr.com/photos/biodivlibrary/13204793153 | description = T. GRAY ON A SEISMOGRAPRTC APPARATUS. <br> 219 <br> The instrument is su...

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