Grandfather_clock_pendulum.png
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Summary
Description Grandfather clock pendulum.png |
English:
Drawing of a typical grandfather clock
pendulum
, from a 1901 physics book. It is a
seconds pendulum
, with each swing of the pendulum taking one second. Slightly less than 1 meter (39 in.) long. It consists of a metal weight suspended on a wooden rod, since wood expands and contracts with temperature less than metal, keeping the period of the pendulum more constant. Under the weight is a knurled rate adjustment nut, which adjusted the rate of the clock by moving the weight up and down on the pendulum rod. The weight has a streamlined disc shape to minimize air resistance. Alterations to image: removed caption.
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Date | |
Source | Downloaded 2009-01-16 from Charles H. Henderson & John F. Woodhull (1901) The Elements of Physics , D. Appleton & Co., New York, p.59, fig.21 on Google Books. |
Author | Charles H. Henderson and John F. Woodhull |
Permission
( Reusing this file ) |
Public domain in US - published in US prior to 1923 |
Licensing
Public domain Public domain false false |
This media file is in the
public domain
in the
United States
. This applies to U.S. works where the copyright has expired, often because its first
publication
occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See
this page
for further explanation.
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This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the
rule of the shorter term
for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See
Wikipedia:Public domain
and
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for more details.
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