File:Early Quadrant Electrometer.png
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Summary
| Description |
English: Early quadrant electrometer, one of the first electrical measuring instruments, consisting of a lightweight ball of pith suspended by a thread from a brass post, with a scale to measure the angle. It was mounted on early electrostatic lab equipment such as electrostatic generators and Leyden jars to indicate the amount of electric charge present. When the post has no charge, the ball hangs straight down. When an electric charge is introduced, some of the charge is transferred to the surface of the ball. Since it has the same charge as the post it is repelled and hangs at an angle. The angle gives a rough indication of the amount of charge. |
| Date | |
| Source | 1861, "A textbook on chemistry" |
| Author | John William Draper |
Licensing
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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.
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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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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 23:28, 10 October 2013 | | 89 × 238 (9 KB) | J1812 | User created page with UploadWizard |
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