History of Chain drive

The most seasoned known application of a chain drive shows up in the Polybolos, a rehashing crossbow portrayed by the Greek engineer Philon of Byzantium. Two level joined fastens were associated with a windlass, which by slowing down and forward would consequently fire the machine's bolts until its magazine was vacant. The Greek outline denote the start of the historical backdrop of the chain drive since no prior occurrence of such a cam is referred to, and none as perplexing is known until the sixteenth century. It is here that the level connection chain, regularly ascribed to Leonardo da Vinci, really showed up. The principal chain drive in China was delineated in the composed horological treatise of the Song Dynasty Chinese engineer Su Song, who utilized it to work the armillary circle of his galactic clock tower and also the clock jack puppets displaying the time of day by mechanically blasting gongs and drums. The chain drive itself was given force through the water driven works of Su's water clock tank and waterwheel, the last which went about as an extensive rigging.

A chain of Difference

A chain is a series of connected links which are usually made of metal. A chain may contain two or more links.

Chains are generally made in one of two styles, as per their intended use:

·         Those intended for lifting, such as when employed with a hoist; for pulling; or for safety, 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 intended for carrying power in machines have links planned to interconnect with the teeth of the sprockets of the machine, and are flexible in only one dimension. They are identified as roller chains, though there are also non-roller chains such as block chain.

Two separate chains can be linked using a quick link which looks like a carabiner with a screw close rather than a latch.

Chain

Ø  Bicycle chain, transfers power from the pedals to the drive-wheel of a bicycle thus propelling it

Ø  Chain drive, the main feature that differentiated the safety bicycle

Ø  Chain gun, type of machine gun that is driven by an external power source, sometimes connected by a chain, to actuate the mechanism rather than using recoil

Ø  Chain pumps, type of water pump where an endless chain has positioned on it circular discs

Ø  Chain-linked Lewis, lifting device made from two curved steel legs

Ø  Chainsaw, portable mechanical, motorized saw using a cutting chain to saw wood.

Ø  Chain steam shipping

Ø  Curb chain, used on curb bits when riding a horse

Ø  Door chain, a type of security chain on a door that makes it possible to open a door from the inside while still making it difficult for someone outside to force their way inside

Ø  Keychain, a small chain that connects a small item to a key ring

Ø  Lead shank (or "Stud chain"), used on horses that are misbehaving

Ø  Lavatory chain, the chain attached to the cistern of an old-fashioned W.C. in which the flushing power is obtained by a gravity feed from above-head height. Although cisterns no longer work like that, the phrase "pull the chain" is still encountered to mean "flush the toilet".

Ø  O-ring chain, a specialized type of roller chain

Ø  Roller chain, the type of chain most commonly used for transmission of mechanical power on bicycles, motorcycles, and in industrial and agricultural machinery

Difference (philosophy)

Difference is a key concept of continental philosophy, denoting the process or set of properties by which one entity is distinguished from another within a relational field or a given conceptual system. In the Western philosophical system, difference is traditionally viewed as being opposed to identity, following the Principles of Leibniz, and in particular his Law of the Identity of indiscernibles. In structuralist and poststructuralist accounts, however, difference is understood to be constitutive of both meaning and identity. In other words, because identity (particularly, but not limited to, personal identity) is viewed in non-essentialist terms as a construct, and because constructs only produce meaning through the interplay of differences (see below), it is the case that for both structuralism and poststructuralism, identity cannot be said to exist without difference.

Chain

A chain is a series of connected links which are typically made of metal. A chain may consist of two or more links.
Chains are usually made in one of two styles, according to their intended use:
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 makes 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.