Centrifugal governor

A centrifugal governor is a specific type of governor with a feedback system that controls the speed of an engine by regulating the amount of fuel (or working fluid) admitted, so as to maintain a near-constant speed, irrespective of the load or fuel-supply conditions. It uses the principle of proportional control.

It was invented in 1788 by James Watt to control his steam engine where it regulates the admission of steam into the cylinder(s). Its widest use was on steam engines during the Steam Age in the 19th century. It is also found on internal combustion engines and variously fueled turbines, and in some modern striking clocks.

Operation

The device shown is from a steam engine. Power is supplied to the governor from the engine's output shaft by a belt or chain connected to the lower belt wheel. The governor is connected to a throttle valve that regulates the flow of working fluid (steam) supplying the prime mover. As the speed of the prime mover increases, the central spindle of the governor rotates at a faster rate and the kinetic energy of the balls increases. This allows the two masses on lever arms to move outwards and upwards against gravity. If the motion goes far enough, this motion causes the lever arms to pull down on a thrust bearing, which moves a beam linkage, which reduces the aperture of a throttle valve. The rate of working-fluid entering the cylinder is thus reduced and the speed of the prime mover is controlled, preventing over-speeding.

Watt

The watt (symbol: W) is a derived unit of power in the International System of Units (SI), named after the Scottish engineer James Watt (1736–1819). The unit is defined as joule per second and can be used to express the rate of energy conversion or transfer with respect to time. It has dimensions of L²MT⁻³.

Examples

When an object's velocity is held constant at one meter per second against constant opposing force of one newton the rate at which work is done is 1 watt.

In terms of electromagnetism, one watt is the rate at which work is done when one ampere (A) of current flows through an electrical potential difference of one volt (V).

Two additional unit conversions for watt can be found using the above equation and Ohm's Law.

Where ohm () is the SI derived unit of electrical resistance.

Watt (novel)

Watt was Samuel Beckett's second published novel in English, largely written on the run in the south of France during the Second World War and published by Maurice Girodias's Olympia Press in 1953 (an extract had been published in the Dublin literary review, Envoy, in 1950). A French translation followed in 1968.

Content

Narrated in four parts, it describes Watt's journey to, and within, Mr Knott's house; where he becomes the reclusive owner's manservant, replacing Arsene, who delivers a long valedictory monologue at the end of section one. In section two Watt struggles to make sense of life at Mr Knott's house, experiencing deep anxiety at the visit of the piano tuning Galls, father and son, and a mysteriously language-resistant pot, among other incidents. In section three, which has a narrator called Sam, Watt is in confinement, his language garbled almost beyond recognition, while the narrative veers off on fantastical tangents such as the story of Ernest Louit's account to a committee of Beckett's old university, Trinity College, Dublin of a research trip in the West of Ireland. The shorter fourth section shows Watt arriving at the railway station from which, in the novel's skewed chronology, he sets out on a journey to the institution he has already reached in section three.

Watt (surname)

The surname Watt may refer to: