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File:Kind free-falling tool.jpg

Kind_free-falling_tool.jpg ‎(76 × 450 pixels, file size: 22 KB, MIME type: image/jpeg)

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Description Free-falling tool used for boring. The shank of the bit is gripped and released by the jaws J,J, worked through a toggle joint by movements of the disk D. When the rod begins it's downward stroke, the resistance of the water in the hole slightly raises D, thus opening the jaws and releasing the bit, which falls by gravity. On reaching the end of the stroke the jaws again catch the shank of the bit and raise it for delivering another blow.
Source 1911 EB, Vol. 4, Page 253
Author Encyclopedia Britannica
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(Reusing this file)		 Public domain (see here:http://projects.ericshalov.com/freeimages/446/Kind-Free-Falling-Tool)

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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
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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current01:32, 16 July 2009Thumbnail for version as of 01:32, 16 July 200976 × 450 (22 KB)Phn229 (talk | contribs){{Information |Description=Free-falling tool used for boring. The shank of the bit is gripped and released by the jaws J,J, worked through a toggle joint by movements of the disk D. When the rod begins it's downward stroke, the resistance of the water in

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