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A helmet is a form of protective clothing worn on the head and usually made of metal or some other hard substance, typically for protection from falling objects or high-speed collisions. Helmets are common in the military, construction, mining and some sports, including American football and rock climbing. Motorcycle helmets and bicycle helmets are compulsory headgear in some jurisdictions; in the United Kingdom only Sikhs are allowed to ride motorcycles without wearing motorcycle helmets.
Helmets are among the most ancient forms of protection, and are known to have been worn by ancient Greeks and throughout the Middle Ages; at this time they were primarily military equipment, protecting the head from cutting blows with swords and flying arrows. They were initially constructed from leather, but eventually came to be made entirely from ironThis article is about metallic iron. For the ironing device, see ironing manganese iron cobalt Fe Ru Full table General Name, Symbol, Number iron, Fe, 26 Chemical series transition metal Group, Period, Block 8 (VIIIB), 4 , d Density, Hardness 7874 kg/m3,, with a variety of functional enhancements. Military use of helmets declined as firearms became widespread, where traditional helms offered little protection. However, with the increasing use of heavy artilleryFor the thrash metal band, see Artillery (band Historically, artillery refers to any engine used for the discharge of projectiles during war. The term also describes ground-based troops with the primary function of manning such weapons. The word as used i, the steel helmet made a comeback in the 20th Century as protection for the head from shrapnelShrapnel in the strict sense, is shot deliberately included in a landmine or shell intended to be scattered by the explosion. The pellets in the Claymore mine used by the United States meet this definition. More loosely, the term is used to refer to any f.
GogglesGoggles are a form of protective eyeware that usually enclose the eye area to prevent particulates or chemicals from striking the eyes. They are often used in chemistry laboratories or in woodworking. They are often used in snow sports as well, and in swi are another form of protective headgear. They are not typically needed while wearing a helmet that protects the eyes as well. Hard hatA hard hat is a type of helmet predominately used in workplace environments such as construction sites to protect the head from injury such as from falling objects. They are typically required personal protective equipment where heavy labor is being perfos are typically preferred in modern times for construction workers.See also:
For information about the band Helmet, see here