A derrick is a lifting device composed of one tower, or guyed mast such as a pole which is hinged freely at the bottom. It is controlled by lines (usually four of them) powered by some means such as man-hauling or motors, so that the pole can move in all four directions. A line runs up it and over its top with a hook on the end, like with a crane. It is commonly used in docks and onboard ships. Some large derricks are mounted on dedicated vessels, and are often known as "floating derricks".

The device was named for its resemblance to a type of gallows from which a hangman's noose hangs. The derrick type of gallows in turn got its name from Thomas Derrick, an English executioner from the Elizabethan era.

Another kind of derrick is used over oil wells and other drilled holes. This is generally called an oil derrick and is a complex set of machines specifically designed for optimum efficiency, safety and low cost. This is used on some offshore oil and gas rigs.

The centerpiece is the archetypical derrick tower, used for lifting and positioning the drilling string and piping above the well bore, and containing the machinery for turning the drilling bit around in the hole. As the drill string goes deeper into the underlying soil or rock, new piping has to be added to the top of the drill to keep the connection between drill bit and turning machinery intact, to create a filler to keep the hole from caving in, and to create a conduit for the drilling mud. The drilling mud is used to cool the drilling bit and to blow rock debris clear from the drill bit and the bottom of the well. The piping joints sections—usually each about 10 meters (30 ft) long—have threaded ends, so they can be screwed together. The piping is hollow to allow for the mud to be pumped down into the drilling hole, where it flushes out at the drilling bit. The mud then proceeds upwards towards the surface on the outside of the piping, carrying the debris with it.

Chambers may refer to:

Canada:

United States:

John Schultz (born 28 September 1938) is a former Australian rules football player, who played for the Footscray Football Club in the (then) Victorian Football League (VFL) and is one of the club's greatest players.

He had been a champion high-jumper at Caulfield Grammar School, winning the senior high jump at the 1955 Associated Grammar Schools Combined Athletics Meeting (as had South Melbourne's Jim Taylor in 1948). He also played for the school's First XVIII, a team which also contained other future VFL players, Ron Evans of Essendon, and Ron Cabble of Hawthorn.

John Schulz was considered a "gentle giant", known as much for his fairness as for his brilliance. An effective knock ruckman, he was acclaimed for good tackling, elegant marking and hard, fair bumping. Compared with others of his day, Schultz had exceptional stamina and he seemed to be able to run just as quickly at the end of a match as he had at its beginning.

Schultz was recruited by Footscray from country side Boort, having previously played briefly with Caulfield Grammarians Football Club in the Victorian Amateur Football Association (he broke his arm at the opening bounce of the first Caulfield Grammarians' practice match of the 1956 season).

Edward "Eddie" Chambers (born March 29, 1982 in Pittsburgh) is an American heavyweight boxer fighting out of Philadelphia, Pennsylvania.

Eddie started boxing professionally in 2000 at the age of 18. For the first five years, he fought unknown opponents before raising his level of competition significantly in 2005 against clubfighters Ross Puritty and Robert Hawkins.

In 2006 he took a further step upward by defeating former title challenger Ed Mahone and renowned clubfighter Domonic Jenkins (in spite of his record of only 9-5 Jenkins had beaten several prospects).

In May 2007, Chambers stopped 15–0 Derric Rossy and defeated Dominic Guinn on Shobox. Later in 2007 he took part in IBF's 4-man elimination tournament to face the current champion Wladimir Klitschko. Chambers beat Calvin Brock via split decision in semifinals, but lost unanimously to Alexander Povetkin in the final bout.

After his fight with Povetkin he won three more bouts against opponents like Raphael Butler before facing Samuel Peter on March 27, 2009 and defeated him by majority decision. He scored another decision win afterwards against Alexander Dimitrenko on July 4, 2009 in a WBO title eliminator bout, which made him the mandatory challenger for the WBO heavyweight title held by Wladimir Klitschko.