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ఇది పెట్టుకొంటే చాలు మీరువెళ్లే రూట్ చాలా సులభం | Latest Technology Updates | Alo TV Channel

45 views · Published 19 September 2018 · 1:41 · Indexed 30 October 2026

Channel: Alo TV Channel · 2018 · Entertainment

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ఇది పెట్టుకొంటే చాలు మీరువెళ్లే రూట్ చాలా సులభం

A helmet is a form of protective gear worn to protect the head from injuries. More specifically, a helmet aids the skull in protecting the human brain. Ceremonial or symbolic helmets (e.g. UK policeman's helmet) without protective function are sometimes used. The oldest known use of helmets was by Assyrian soldiers in 900 BC, who wore thick leather or bronze helmets to protect the head from blunt object and sword blows and arrow strikes in combat. Soldiers wear helmets, often made from lightweight plastic materials.

The word helmet is diminutive from helm, a medieval word for protective combat headgear.The medieval great helm covers the whole head and often is accompanied with camail protecting throat and neck as well. Originally a helmet was a helm which covered the head only partly and protected it from injury in accidents.

In civilian life, helmets are used for recreational activities and sports (e.g. jockeys in horse racing, American football, ice hockey, cricket, baseball, camogie, hurling and rock climbing); dangerous work activities (e.g. construction, mining, riot police); and transportation (e.g. motorcycle helmets and bicycle helmets). Since the 1990s, most helmets are made from resin or plastic, which may be reinforced with fibers such as aramids.

Designs
Some British gamekeepers during the 18th and 19th centuries wore helmets made of straw bound together with cut bramble.Developed in the mid-19th century, the pith helmet, made of pith or cork, was often worn by Europeans in the tropics.

Military applications in the 19th-20th centuries saw a number of leather helmets, particularly among aviators and tank crews in the early 20th century. In the early days of the automobile, some motorists also adopted this style of headgear, and early football helmets were also made of leather. In World War II, American, Soviet, German, Italian and French flight crews wore leather helmets, the German pilots disguising theirs under a beret before disposing of both and switching to cloth caps.The era of the First and Second World Wars also saw a resurgence of metal military helmets, most notably the Brodie helmet and the Stahlhelm.

Modern helmets have a much wider range of applications, including helmets adapted to the specific needs of many athletic pursuits and work environments, and these very often incorporate plastics and other synthetic materials for their light weight and shock absorption capabilities. Some types of synthetic fibers used to make helmets in the 21st century include Aramid, Kevlar and Twaron.

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