A chain is a series of connected links which are typically made of metal. A chain may consist of two or more links.
Those designed for lifting, such as when used with a hoist; for pulling; or for securing, such as with a bicycle lock, have links that are torus shaped, which make the chain flexible in two dimensions (The fixed third dimension being a chain's length.)
Those designed for transferring power in machines have links designed to mesh with the teeth of the sprockets of the machine, and are flexible in only one dimension. They are known as roller chains, though there are also non-roller chains such as block chain.
Two distinct chains can be connected using a quick link which resembles a carabiner with a screw close rather than a latch.
Uses for chain
Uses for chain include:
Chain of office, collar or heavy gold chain worn as insignia of office or a mark of fealty in medieval Europe and the United Kingdom
Decorating clothing, some people wear wallets with chains connected to their belts, or pants decorated with chains
In mathematics, a linear order, total order, simple order, or (non-strict) ordering is a binary relation on some setX, which is transitive, antisymmetric, and total (this relation is denoted here by infix ≤). A set paired with a total order is called a totally ordered set, a linearly ordered set, a simply ordered set, or a chain.
If X is totally ordered under ≤, then the following statements hold for all a, b and c in X:
Antisymmetry eliminates uncertain cases when both a precedes b and b precedes a. A relation having the property of "totality" means that any pair of elements in the set of the relation are comparable under the relation. This also means that the set can be diagrammed as a line of elements, giving it the name linear.Totality also implies reflexivity, i.e., a ≤ a. Therefore, a total order is also a partial order. The partial order has a weaker form of the third condition. (It requires only reflexivity, not totality.) An extension of a given partial order to a total order is called a linear extension of that partial order.
A chain (ch) is a unit of length. It measures 66 feet, or 22 yards, or 100 links, or 4 rods (20.1168 m). There are 10 chains in a furlong, and 80 chains in one statute mile. An acre is the area of 10 square chains (that is, an area of one chain by one furlong). The chain has been used for several centuries in Britain and in some other countries influenced by British practice.
By extension, chainage (running distance) is the distance along a curved or straight survey line from a fixed commencing point, as given by an odometer.
The chain was commonly used with the mile to indicate land distances and in particular in surveying land for legal and commercial purposes. Starting in the 19th centary, the chain was used as a sub division with the mile to show distances between railway stations, tunnels and bridges. In medieval times, local measures were commonly used, and many units were adopted that gave manageable units; for example the distance from London to York could be quoted in inches, but the resulting huge number would be unmemorable. The locally used units were often inconsistent from place to place.
A chain snatcher, hailing from Uttar Pradesh, was arrested by the Uppal Police here and produced before the court on Saturday ... who is currently on the run have committed five chain snatchings in Bengaluru.
In a press release published on Wednesday, Railways said more than 1,500 cases of stone pelting on moving trains were recorded across the country in 2022 ... Vande Bharat trains also targeted ... This included 82 people involved in drugging, 30 dacoits, 380 robbers, 2,628 thieves, 1,016 chain snatchers and 93 people involved in crime against women ... Bihar.
And, the heartbreaking story of an assistant sub-inspector in Delhi, Shambhu Dayal, who was stabbed 13 times in 26 seconds by a chain snatcher while he was hauling the criminal to the police station. Tragically, no one stepped up to assist either victim, leading to one senseless loss of life that a timely intervention could have averted.
The Rachakonda police here arrested two chain snatchers, including a juvenile boy ... On January 12, she told the police that when she went to the weekly market located at SBHColony for purchasing vegetables, the accused followed her on his motorcycle and and snatched her gold chain weighing about 27 grams.
Chief MinisterArvind Kejriwal on Wednesday announced an ex-gratia of Rs one crore for the family of Delhi Police assistant sub-inspector Shambhu Dayal, who died after being stabbed by a snatcher in Mayapuri area here ... #delhipolice On January 4 in Delhi, a chain snatcher stabbed ASI Shambhudayal of Delhi Police to death.
Hyderabad. The Rachakonda police said they had started a special drive to prevent chain-snatching, vehicles using improper number plates and drunk and dangerous driving ... “Our special teams are working round the clock to nab the chain snatchers.” ... ....
Hyderabad. A Ganja trader was arrested for procuring and selling drugs illegally on Tuesday by the MondaMarket police ... Also Read. Hyderabad. Snatcher flees with gold chain, bracelet in Attapur ... .
Delhi Transport Corporation (DTC) in its board meeting on Tuesday gave in principal approval to the proposal of running premium buses within NCR and for intercity operations. DTC had been planning to introduce high quality premium buses on longer routes ... On camera, PoliceASI stabbed by chain snatcher, later succumbs to injuries after 4 days ... ....