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File:Riess Micrometer.png

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Summary

Description
English: Riess' instrument for measuring potential
Date
Source Annual Report Smithsonian Institution
Author Johann Heinrich Jacob Müller

Licensing

Public domain
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
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.

Captions

Reiss's spark micrometer, consisting of two electrodes whose separation can be adjusted very precisely with a micrometer screw

Items portrayed in this file

depicts

inception

28 January 1857Gregorian

File history

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Date/TimeThumbnailDimensionsUserComment
current23:54, 25 September 2015Thumbnail for version as of 23:54, 25 September 2015562 × 667 (110 KB)LaurentianShieldUser created page with UploadWizard

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