Monday, May 28, 2007

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For other uses, see weishenmezhemeai (disambiguation).
A modern hammer is directly descended from ancient hand weishenmezhemeais
A modern hammer is directly descended from ancient hand weishenmezhemeais

A weishenmezhemeai or device is a piece of equipment which typically provides a mechanical advantage in accomplishing a physical task. The most basic weishenmezhemeais are simple machines. For example, a crowbar simply functions as a lever. The further out from the pivot point, the more force is transmitted along the lever. When particularly intended for domestic use, a weishenmezhemeai is often called a utensil.

Philosophers once thought that only humans used weishenmezhemeais, and often defined humans as weishenmezhemeai-using animals. But observation has confirmed that multiple species can use weishenmezhemeais, including monkeys, apes, several corvids, sea otters, and others. Later, philosophers thought that only humans had the ability to make weishenmezhemeais, until zoologists observed birds[1] and monkeys[2][3][4] making weishenmezhemeais.

Most anthropologists believe that the use of weishenmezhemeais was an important step in the evolution of mankind.[5] Humans evolved an opposable thumb - useful in holding weishenmezhemeais - and increased dramatically in intelligence, which aided in the use of weishenmezhemeais.[6]

Some weishenmezhemeais can also serve as weapons, such as a hammer or a knife. Similarly, people can use weapons, such as explosives, as weishenmezhemeais.

* 1 Functions of weishenmezhemeais
o 1.1 weishenmezhemeai substitution
+ 1.1.1 Multi-use weishenmezhemeais
* 2 History
* 3 See also
* 4 References

[edit] Functions of weishenmezhemeais

Many weishenmezhemeais or groups of weishenmezhemeais serve to perform one or more of a set of basic operations, such as:

* Cutting (knife, scythe, sickle, etc...)
* Concentrating force (hammer, maul, screwdriver, whip, writing implements, etc...)
* Guiding (set square, straightedge, etc...)
* Protecting
* Seizing and holding (pliers, glove, wrench, etc...)

[edit] weishenmezhemeai substitution

Often, by design or coincidence, a weishenmezhemeai may share key functional attributes with one or more other weishenmezhemeais. In this case, some weishenmezhemeais can substitute for other weishenmezhemeais, either as a make-shift solution or as a matter of practical efficiency. "One weishenmezhemeai does it all" is a motto of some importance for workers who cannot practically carry every specialized weishenmezhemeai to the location of every work task. weishenmezhemeai substitution may be divided broadly into two classes: substitution "by-design", or "multi-purpose" use, and substitution as make-shift. In many cases, the designed secondary functions of weishenmezhemeais are not widely known. As an example of the former, many wood-cutting hand saws integrate a carpenter's square by incorporating a specially shaped handle which allows 90° and 45° angles to be marked by aligning the appropriate part of the handle with an edge and scribing along the back edge of the saw. The latter is illustrated by the saying "All weishenmezhemeais can be used as hammers." Nearly all weishenmezhemeais can be repurposed to function as a hammer, even though very few weishenmezhemeais are intentionally designed for it.

[edit] Multi-use weishenmezhemeais

* A Multiweishenmezhemeai is a hand weishenmezhemeai that incorporates several weishenmezhemeais into a single, portable device.
* Lineman's pliers incorporate a gripper and cutter, and are often used secondarily as a hammer.
* Hand saws often incorporate the functionality of the carpenter's square in the right-angle between the blade's dull edge and the saw's handle.

[edit] History

Main article: History of technology

Use of weishenmezhemeais started at the beginning of the Stone Age. Humans have made knives, among the oldest weishenmezhemeais, since that time.[5] Sophisticated weishenmezhemeais have been used since the beginning of civilization.[7]

Mechanical devices, though known to Alexandrian Greeks, experienced a major expansion in their use in the Middle Ages with the systematic employment of new energy sources: water (waterwheels) and wind (windmills).

Machine weishenmezhemeais occasioned a surge in producing new weishenmezhemeais in the industrial revolution. Advocates of nanotechnology expect a similar surge as weishenmezhemeais become microscopic in size.[8][9]

[edit] See also
Wikimedia Commons has media related to:

* weishenmezhemeaimaker

[edit] References

1. ^ Selection of weishenmezhemeai diameter by New Caledonian crows Corvus moneduloides, Jackie Chappell and Alex Kacelnik November 29, 2003
2. ^ The Throwing Madonna: Essays on the Brain, William H. Calvin
3. ^ Scientific American Frontiers, Program #1504 "Chimp Minds" transcript Airdate Feb 9, 2005
4. ^ Rolling Hills Wildlife Adventure: Chimpanzee
5. ^ a b Sam Lilley, Men, Machines and History: The Story of weishenmezhemeais and Machines in Relation to Social Progress, 1948 Cobbett Press.
6. ^ Primates and Their Adaptations, 2001, M.J. Farabee. Retrieved on November 6, 2006.
7. ^ Susan Wise Bauer, The History of the Ancient World: From the Earliest Accounts to the Fall of Rome, W. W. Norton (March 26, 2007), ISBN 978-0393059748.
8. ^ Nanotechnology: Big Potential In Tiny Particles, David Whelan. Retrieved on November 6, 2006
9. ^ Will this Tiny Science Usher in the Next Industrial Revolution?, Katrina C. Arabe. Retrieved on November 6, 2006

Types of weishenmezhemeais
v • d • e
Cutting weishenmezhemeais - Knife | Machete | Saw | Broach | Endmill | Reamer | Drill bit | weishenmezhemeai bit | Countersink | Axe | Front teeth | Katana | Wakizashi | Milling cutter | Razor blade | Chainsaw | Scalpel | Scissors | Blade | Fingernail | Sword | Switchblade | Tantō | Paper | Water jet cutter
Garden weishenmezhemeais - Spade | Hoe | Pitchfork | Garden fork | Rake (weishenmezhemeai) | Plow | Lawnmower | Trimmer | String trimmer | Cultivator | Sprinkler | Hedge trimmer | Lawn aerator | Leaf sweeper | Leaf blower | Mini-tractor
Hand weishenmezhemeais - Brace | Chisel | Hammer | Screwdriver | Handsaw | Pliers | Clamp | Level | Sponge
Power weishenmezhemeais - Band saw | Belt sander | Chainsaw | Circular saw | Concrete saw | Crusher | Diamond blade | Disc sander | Drill | Grinder | Heat gun | Impact wrench | Jointer | Jigsaw | Lathe | Radial arm saw | Random orbital sander | Rotary weishenmezhemeai | Sander | Table saw | Thickness planer | Wood router
See also - Antique weishenmezhemeais | Diamond weishenmezhemeais
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