File:US patent 2886717 detail - Ferranti diffraction system.png

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English: The Ferranti measurement system - using diffraction gratings for 5 micrometer precision over up to 1.5 meter span. US patent 2886717, by D. T. N. Williamson, filed 14-03-1953
Date
Source US patent 2886717, part of figure 1
Author en:David Theodore Nelson Williamson
Public domain The text and illustrations of US patents published before March 1, 1989 are in the public domain unless the patent text contains a specific notice that portions are copyrighted. See 37 CFR 1.71(d), 37 CFR 1.84(s)

The original patent contains no such notice, so its contents are in the public domain. Note: This only applies to images published before March 1, 1989. Patents published after that date are most likely copyrighted, unless in the public domain for another reason, such as {{PD-ineligible}}.

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current00:58, 18 March 2018Thumbnail for version as of 00:58, 18 March 20181,921 × 1,100 (659 KB)Retired electrician (talk | contribs){{Information |Description={{en|The Ferranti measurement system - using diffraction gratings for 5 micrometer precision over up to 1.5 meter span. US patent 2886717, by D. T. N. Williamson, filed 14-03-1953}} |Source=US patent 2886717, part of figure 1 |Date=1953 |Author=en:David Theodore Nelson Williamson |Permission= |other_versions= }} {{PD-US-patent-no notice}} Category:Transmission gratings Category:Computer numerical control Category:Linear encoders

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