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Clock_Mainspring.png (722 × 384 pixels, file size: 34 KB, MIME type: image/png)

Summary

Description

Drawing of a clock mainspring from the mid 19th century.

WARNING - Never disassemble a watch or clock that contains a mainspring without the proper tools and techniques. The mainspring contains a lot of energy and can release suddenly, causing serious injury.
Date
Source Downloaded from Dionysius Lardner (1858) Handbook of Natural Philosophy: Mechanics, Walton & Maberley, London, fig.325, p.355 on Google Books
Author Dionysius Lardner
Permission
(Reusing this file)		 Public domain - artist died in 1859

Licensing

Public domain

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 Note that a few countries have copyright terms longer than 70 years: Mexico has 100 years, Jamaica has 95 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. Honduras has a general copyright term of 75 years, but it does implement the rule of the shorter term. Copyright may extend on works created by French who died for France in World War II (more information), Russians who served in the Eastern Front of World War II (known as the Great Patriotic War in Russia) and posthumously rehabilitated victims of Soviet repressions (more information).
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media type

image/png

checksum

0ee6160c2e22a4b805a997ff47557ad3487a36fe

determination method or standard: SHA-1

data size

34,842 byte

height

384 pixel

width

722 pixel

File history

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Date/TimeThumbnailDimensionsUserComment
current01:21, 27 November 2007Thumbnail for version as of 01:21, 27 November 2007722 × 384 (34 KB)Chetvorno{{Information |Description=Woodcut of a clock mainspring. |Source=Downloaded from [http://books.google.com/books?id=gLgLAAAAYAAJ&pg=PA355 Dionysius Lardner (1858) ''Handbook of Natural Philosophy: Mechanics'', Walton & Maberley, London, fig.325, p.355] on

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