File:Beckman Helipot Potentiometer Model SA1400A - DPLA - bb59e2dd8d27cd60ccdf7694d266c252.jpg

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Beckman Helipot Potentiometer Model SA1400A   (Wikidata search (Cirrus search) Wikidata query (SPARQL)  Create new Wikidata item based on this file)
Creator
InfoField
Beckman Instruments, Inc
Title
Beckman Helipot Potentiometer Model SA1400A
Description
Black finished cylindrical casing with three copper electrodes in a line next to product inscription; nickel knob is raised above the cylinder; outer dial goes from 0-15 (but only three digits are visible through its viewing slit); outer dial value changes when inner dial (0-100) is manually rotated 360 degrees; knob handle is black plastic. Potentiometers are used to measure electromotive force (emf) by balancing it with a known emf. The concept was first developed in 1841 by J. C. Poggendorff and improved throughout the 19th century by Latimer Clark and J. A. Fleming.
Date Unknown date
Unknown date
institution QS:P195,Q5090408
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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.

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current02:27, 5 October 2022Thumbnail for version as of 02:27, 5 October 20226,100 × 7,554 (2.28 MB)DPLA bot (talk | contribs)Uploading DPLA ID bb59e2dd8d27cd60ccdf7694d266c252

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