File:Versorium.gif

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Description

English: Gilbert's "versorium", the first crude electroscope, invented by English physician William Gilbert around 1600. This was the first electrical measuring instrument. It consisted of a metal needle free to turn on a pivot, similar to a compass needle but unmagnetized. When an object charged with static electricity was brought near, the needle would swing around and point to it. The motion was due to the attraction of a temporary charge of opposite polarity induced in the near end of the needle by the external charge.

Date

25 November 2001

Source

http://www-spof.gsfc.nasa.gov/earthmag/NSTA1B.htm

Author

David P. Stern, [1]

Permission
(Reusing this file)

	This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
	Warnings: Use of NASA logos, insignia and emblems is restricted per U.S. law 14 CFR 1221. The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain. Materials based on Hubble Space Telescope data may be copyrighted if they are not explicitly produced by the STScI.[2] See also {{PD-Hubble}} and {{Cc-Hubble}}. The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [3] Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted. [4] The National Space Science Data Center (NSSDC) site has been known to host copyrighted content. Its photo gallery FAQ states that all of the images in the photo gallery are in the public domain "Unless otherwise noted."

File history

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	13:59, 24 June 2009		206 × 86 (1 KB)	wikimediacommons>老陳	{{Information \|Description={{en\|1=Gilbert's Versorium}} \|Source=http://www-spof.gsfc.nasa.gov/earthmag/NSTA1B.htm \|Author=David P. Stern, [ http://www.phy6.org/stargaze/Sstern.htm] \|Date=2001-11-25 \|Permission={{PD-USGov-NASA}} \|other_versions= }} <!--{{

File usage

The following page uses this file:

Versorium

File:Versorium.gif

Captions

Items portrayed in this file

depicts

copyright status

public domain

inception

25 November 2001

media type

image/gif

File history

File usage