A sketch of a typical concertina wire obstacle

Concertina wire is a type of Modern barbed Wire Barbed wire is a type of fencing wire constructed with sharp edges or points arranged at intervals along the strand(s). It is used to construct inexpensive fences. A person or animal trying to pass through a barbed-wire fence will suffer discomfort and possibly injury. Barbed... barbed wire or Barbed tape or razor wire is a mesh of metal strips with sharp edges whose purpose it is to prevent passage by human beings. Although it is sharper than the barbs of barbed wire, it is not actually razor sharp; the name razor wire is a slang term derived from... razor wire that is formed in large coils which can be expanded like a English concertina made by Wheatstone around 1920 A concertina, like the various accordions, is a member of the free-reed family of instruments. It was first invented in 1829 by Sir Charles Wheatstone . Concertinas typically have buttons on both ends and are distinguished from an accordion (piano or button) by... concertina. Each coil actually consists of two oppositely wound This article is about the shape. See Helix (disambiguation) for other meanings. A helix (pl: helices), from the Greek word έλικας/έλιξ, is a twisted shape like a spring, screw or a spiral staircase. Helices are important in biology, as DNA is... helices which support each other against crushing whilst allowing easy longitudinal movement. In conjunction with plain barbed wire and steel pickets, it is used to form Military (from Latin militarius, miles soldier) as an adjective describes anything related to soldiers and warfare, more specifically to do with land forces, the sea forces equivalent being naval. Used as a noun, it is equivalent to Armed force. See also Armed force Martial art Militaria Military history Military rule... military In the military science of fortification, wire obstacles are defensive obstacles made from barbed wire, barbed tape or concertina wire. They are designed to disrupt or delay an attacking enemy. Depending on the requirements and available resources, wire obstacles may range from a simple barbed wire fence in front of... wire obstacles. During Ypres, 1917, in the vicinity of the Battle of Passchendaele. Battle aftermath. Remains of the Chateau Wood World War I (also known as the First World War, the Great War, the War of the Nations, and the War to End All Wars) was a world conflict occurring from 1914 to... World War I soldiers manufactured concertina wire themselves, using ordinary barbed wire. Today it is factory made.

Concertina wire packs flat for ease of transport, but can then be deployed as an obstacle much more quickly than ordinary barbed wire.

US soldiers laying concertina wire Source: from http://www.hood.army.mil/4ID_4th_FSB/images/soldiers%20laying%20concertina%20wire%202.JPG This work is in the public domain because it is a work of the United States federal Government. This applies worldwide. See Copyright. File history Legend: (cur) = this is the...

US soldiers laying concertina wire Source: from http://www.hood.army.mil/4ID_4th_FSB/images/soldiers%20laying%20concertina%20wire%202.JPG This work is in the public domain because it is a work of the United States federal Government. This applies worldwide. See Copyright. File history Legend: (cur) = this is the...

US soldiers laying concertina wire on an exercise

A See also Platoon (movie) and platoon (automobile) for the concept for reducing traffic congestion. Platoon is a term from military science. In an army, a platoon is a unit of thirty to forty soldiers typically commanded by a Lieutenant assisted by a non-commissioned officer. A platoon is formed by... platoon of A Norwegian soldier (a Corporal, armed with an MP-5) A soldier is a person who has enlisted with, or has been conscripted into, the armed forces of a sovereign country and has undergone training and received equipment to defend that country or its interests. In most countries, the term... soldiers can deploy a single concertina fence at a rate of about a A kilometre (American spelling: kilometer) (symbol: km) is a unit of length equal to 1000 metres (from the Greek words khilia = thousand and metro = count/measure). It is approximately equal to 0.621 miles, 1094 yards or 3281 feet. Slang terms for kilometre include klick (sometimes spelt click or klik... kilometre per The hour was originally defined in Egypt as 1/24 of a day, based on their duo-decimal numbering system (which counted finger joints on each hand). In modern usage, an hour was redefined as a unit of time 60 minutes, or 3600 seconds in length. It is approximately 1... hour. Such an obstacle is not very effective by itself, and concertinas are normally built up into more elaborate patterns as time permits.

See also

• This article incorporates text from the public domain 1911 Encyclopædia Britannica. Categories: Military stubs | 1911 Britannica | Fortification ... abatis
• A wire entanglement was one of the most elaborate types of military wire obstacles. The entanglement could in some places be scores of metres thick and several metres deep, with the entire space filled with a random, tangled mass of barbed wire. Entanglements were often not created deliberately, but by... wire entanglement