File:Repsold pendulum.png

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DescriptionRepsold pendulum.png	English: Drawing of Repsold pendulum, a freeswinging reversible pendulum developed in 1869 by German instrument maker Adolf Repsold for use as a precision gravimeter in geophysical serveys. 56.0 cm long between the interchangeable knife blade suspension points, it had a period of 3/4 second. Although symmetrical in form, one of the weights on the end was lighter than the other. It was swung from one built in knife edge pivot and the period timed, then turned upside down and swung from the other pivot and timed. From the two periods and the distance between the knife blades, the gravity could be calculated. Alterations to image: none.
Date	1917
Source	Downloaded 2009-03-07 from Halsey Dunwoody (1917) Notes, Problems, and Laboratory Exercises in Mechanics, Sound, Light, Thermo-mechanics, and Hydraulics, 1st Ed., John Wiley & Sons, New York, p.81, fig.44 on Google Books
Author	Halsey Dunwoody
Permission (Reusing this file)	Public Domain in US - published before 1923 in US

Public domain	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.	United States
	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 Wikipedia:Copyrights for more details.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	12:20, 7 March 2009		201 × 879 (7 KB)	Chetvorno (talk \| contribs)	{{Information \|Description={{en\|Drawing of Repsold pendulum, a freeswinging reversible Wikipedia:pendulum invented in 1869 by German Adolf Repsold for usa as a precision Wikipedia:gravimeter. \|Source= Downloaded 2009-03-07 from [http://boo

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