Image:Leyden unit jar.png

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[edit] Summary

Description

Drawing of a 'unit jar', a small Leyden jar used for measuring electric charge, attached to an electrostatic machine, from mid 1800s. Alterations: removed caption, and noise in white spaces.

In operation, the top terminal (b) is attached to a load. The large bottom electrode is constantly being charged by the electrostatic machine, and the charge builds up on the Leyden jar (K). When the voltage reaches the breakdown voltage of the adjustable spark gap (n,n') it sparks over and discharges the Leyden jar into the load. Then the jar charges up again and the process repeats. Since the same amount of charge is transferred with each spark, the total amount of charge going to the load can be found by counting the sparks.
Source

Downloaded from Henry Minchin Noad (1868) The Student's Text-book of Electricity, Lockwood & Co., London, p.57, fig.55 on Google Books
Date

1868
Author

Henry Minchin Noad
Permission
(Reusing this image)

Public domain - author died in 1877

[edit] Licensing

Public domain This image (or other media file) is in the public domain because its copyright has expired.

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Note that a few countries have copyright terms longer than 70 years: Mexico has 100 years, Colombia has 80 years, and Guatemala and Samoa have 75 years. This image may not be in the public domain in these countries, which moreover do not implement the rule of the shorter term. Côte d'Ivoire has a general copyright term of 99 years and Honduras has 75 years, but they do implement that rule of the shorter term.

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Date/TimeDimensionsUserComment
current13:14, 21 December 2007587×774 (13 KB)Chetvorno ({{Information |Description=Drawing of Leyden 'unit jar', a small Leyden jar used for measuring charge, attached to an electrostatic machine, from mid 1800s. |Source=Downloaded from [http://books.google.com/books?id=4v84AAAAMAAJ&pg=PA57 Henry Minchin Noa)
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