File:Screw demonstrator.png

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Screw_demonstrator.png ‎（538 × 350 像素，檔案大細：31 KB ，MIME類型：image/png）

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摘要

描述Screw demonstrator.png	English: Drawing of a simple machine to demonstrate the action of a screw, from a 1912 scientific instrument catalog. It consists of a threaded shaft, threaded through a stationary mount. As the crank on the left is turned, the shaft moves axially through the hole.
日期	1912年
來源	Downloaded 2011-02-15 from Physical Apparatus Catalog No. 50, Max Kohl A.G., Chemnitz, Germany, 1912, p. 313, fig. 52237 on Instruments for Science 1800-1914 collection, Smithsonian Institution website
作者	Unknown authorUnknown author
許可 (重用呢個檔案)	Public domain in USA - Published in USA prior to 1923

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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	日期／時間	縮圖	尺寸	用戶	註解
現時	2011年2月16號 (三) 19:16		538 × 350（31 KB）	Chetvorno	{{Information \|Description=Drawing of a machine to demonstrate the action of a screw, from a 1914 scientific instrument catalog. \|Source=Downloaded 2011-2-15 from [http://www.sil.si.edu/digitalcollections/trade-literature/scientific-instruments/files/

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