Engineering:Tripod
A tripod is a portable three-legged frame or stand, used as a platform for supporting the weight and maintaining the stability of some other object. The three-legged (triangular stance) design provides good stability against gravitational loads as well as horizontal shear forces, and better leverage for resisting tipping over due to lateral forces can be achieved by spreading the legs away from the vertical centre.
Variations with one, two, and four legs are termed monopod, bipod, and quadripod (similar to a table).
Etymology
First attested in English in the early 17th century, the word tripod comes via Latin tripodis (GEN of tripus),[1][2] which is the romanization of Greek τρίπους (tripous), "three-footed" (GEN τρίποδος, tripodos),[3] ultimately from τρι- (tri-), "three times"[4] (from τρία, tria, "three")[5] + πούς (pous), "foot".[6] The earliest attested form of the word is the Mycenaean Greek 𐀴𐀪𐀠, ti-ri-po, written in Linear B syllabic script.[7]
Cultural use
Many cultures, including the ancient peoples of China and Greece, used tripods as ornaments, trophies, sacrificial altars, cooking vessels or cauldrons, and decorative ceramic pottery. Tripod pottery have been part of the archaeological assemblage in China since the earliest Neolithic cultures of Cishan and Peiligang in the 7th and 8th millennium BC.[8] Sacrificial tripods were found in use in ancient China usually cast in bronze but sometimes appearing in ceramic form.[9] They are often referred to as "dings" and usually have three legs, but in some usages have four legs.
The Chinese use sacrificial tripods symbolically in modern times, such as in 2005, when a "National Unity Tripod" made of bronze was presented by the central Chinese government to the government of northwest China's Xinjiang Uygur Autonomous Region to mark its fiftieth birthday. It was described as a traditional Chinese sacrificial vessel symbolizing unity.[10]
In ancient Greece, tripods were frequently used to support lebes, or cauldrons, sometimes for cooking and other uses such as supporting vases.
Firearms
Tripods are commonly used on machine guns to provide a stable mount for the weapon when firing.[11]
Tripods are generally restricted to heavier weapons where the weight would be an encumbrance. For lighter weapons such as rifles, a bipod is more common. However, in recent times tripod saddles have become popular for precision rifle shooting sports, with the weapon placed in a vise-like rest which is mounted to a tripod head[12][13] or with the weapon mounted directly to the tripod head.
Photography
Surveying
Astronomy
The astronomical tripod is a sturdy three-leg stand used to support telescopes or binoculars, though they may also be used to support attached cameras or ancillary equipment. The astronomical tripod is normally fitted with an altazimuth or equatorial mount to assist in tracking celestial bodies.[14][15]
Laboratory
See also
- ISO 1222 (tripod screw mount)
- Trivet
- Triskelion
References
- ↑ tripus. Charlton T. Lewis and Charles Short. A Latin Dictionary on Perseus Project.
- ↑ Harper, Douglas. "tripod". Online Etymology Dictionary. https://www.etymonline.com/?term=tripod.
- ↑ τρίπους. Liddell, Henry George; Scott, Robert; A Greek–English Lexicon at the Perseus Project
- ↑ τρι- in Liddell and Scott.
- ↑ τρία in Liddell and Scott.
- ↑ πούς in Liddell and Scott.
- ↑ ti-ri-po is found on the PY Ta 641 and PY Ta 709 tablets. 𐀴𐀪𐀠𐀆, ti-ri-po-de (found on the PY Ta 641 tablet), is the NOM dual form of the word. "The Linear B word ti-ri-po-de". Palaeolexicon. Word study tool of ancient languages. http://www.palaeolexicon.com/default.aspx?static=12&wid=559. Raymoure, K.A.. "ti-ri-po". Minoan Linear A & Mycenaean Linear B. Deaditerranean. http://minoan.deaditerranean.com/resources/linear-b-sign-groups/ti/ti-ri-po-de/. "PY 641 Ta (2)". https://www2.hf.uio.no/damos/Index/item/chosen_item_id/4972. "PY 709 Ta (2)". University of Oslo. https://www2.hf.uio.no/damos/Index/item/chosen_item_id/4976.
- ↑ Stark, Miriam T. (2006). Archaeology of Asia. Blackwell Publishing. p. 44. ISBN 978-1-4051-0213-1.
- ↑ Wolfram, Eberhard. A History of China. Berkeley and Los Angeles: University of California Press, 3rd edition, 1969. Cf. p.49 for illustration of Ancient bronze tripod found at Anyang. https://www.gutenberg.org/ebooks/17695.
- ↑ "National Unity Tripod presented to mark Xinjiang's 50th birthday". China: People's Daily. October 1, 2005. http://english.peopledaily.com.cn/200510/01/eng20051001_212056.html.
- ↑ "M122 Tripod". http://www.armystudyguide.com/content/army_board_study_guide_topics/m249/m122-tripod.shtml.
- ↑ Zant, Cal (26 March 2014). "Shooting Rest: HOG Saddle & PIG Saddle Review". https://precisionrifleblog.com/2014/03/26/shooting-rest-hog-saddle-review/.
- ↑ Ewing, Melvin (30 August 2021). "Other Product Review HOG SADDLE – FULL REVIEW". https://snipercentral.com/hog-saddle-full-review/.
- ↑ "Telescope and Tripod". Universe Today. 21 May 2008. http://www.universetoday.com/guide-to-space/telescopes/telescope-tripod/.
- ↑ Rotoni, Vito (23 May 2003). "Telescope Support Stand System: Background of the Invention". U.S. Patent and Trademark Office 7048238. http://www.patentstorm.us/patents/7048238/description.html.
External links
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