Compass (drawing tool)

A compass is a technical drawing instrument that can be used for inscribing circles or arcs. As dividers, they can also be used as tools to measure distances, in particular on maps. Compasses can be used for mathematics, drafting, navigation, and other purposes.

Compasses are usually made of metal or plastic, and consist of two parts connected by a hinge which can be adjusted to allow the changing of the radius of the circle drawn. Typically one part has a spike at its end, and the other part a pencil, or sometimes a pen.

Prior to computerization, compasses and other tools for manual drafting were often packaged as a "bow set" with interchangeable parts. Today these facilities are more often provided by computer-aided design programs, so the physical tools serve mainly a didactic purpose in teaching geometry, technical drawing, etc.

Construction and parts

Compasses are usually made of metal or plastic, and consist of two parts connected by a hinge which can be adjusted to allow the changing of the radius of the circle drawn. Typically one part has a spike at its end, and the other part a pencil, or sometimes a pen.

Drafting

Drafting or draughting may refer to:

See also

Drafting (aerodynamics)

Drafting or slipstreaming is a technique where two vehicles or other moving objects are caused to align in a close group reducing the overall effect of drag due to exploiting the lead object's slipstream. Especially when high speeds are involved, as in motor racing and cycling, drafting can significantly reduce the paceline's average energy expenditure required to maintain a certain speed and can also slightly reduce the energy expenditure of the lead vehicle or object.

Drafting in sport

Drafting is used to reduce wind resistance and is seen most commonly in bicycle racing, car racing, and speedskating, though drafting is occasionally used even in cross-country skiing, downhill skateboarding, and running. Some forms of triathlon allow drafting. Drafting occurs in swimming as well: both in open-water races (occurring in natural bodies of water) and in traditional races in competition pools. In a competition pool a swimmer may hug the lane line that separates them from the swimmer they are abaft of thereby taking advantage of the liquid slipstream in the other swimmer's wake. Drafting also occurs in competitive longboarding.

Compass

A compass is an instrument used for navigation and orientation that shows direction relative to the geographic "cardinal directions", or "points". Usually, a diagram called a compass rose, shows the directions north, south, east, and west as abbreviated initials marked on the compass. When the compass is used, the rose can be aligned with the corresponding geographic directions, so, for example, the "N" mark on the rose really points to the north. Frequently, in addition to the rose or sometimes instead of it, angle markings in degrees are shown on the compass. North corresponds to zero degrees, and the angles increase clockwise, so east is 90 degrees, south is 180, and west is 270. These numbers allow the compass to show azimuths or bearings, which are commonly stated in this notation.

The magnetic compass was first invented as a device for divination as early as the Chinese Han Dynasty (since about 206 BC), and later adopted for navigation by the Song Dynasty Chinese during the 11th century. The use of a compass is recorded in Western Europe and in Persia around the early 13th century.

Compass (Assemblage 23 album)

Compass is the sixth album by the American electronic act Assemblage 23. It was released on October 1, 2009 on Metropolis Records and Accession Records.

Track listing

All songs written, performed and produced by Tom Shear

References

Compass (Simpson)

Compass is a public art work by American artist Gail Simpson, located on the east side of Milwaukee, Wisconsin. The painted alumnium sculpture was commissioned by the Eastside Business Improvement District #20 to serve as a gateway for pedestrians and vehicular traffic entering the North Avenue commercial zone. A tall stainless steel light post salvaged from the demolition of Milwaukee's Park East Freeway is surrounded by a colorful array of painted aluminum signs that protrude in a spiral formation. Each sign has a distinctive shape and word cut out in a unique typeface intended to reflect the history and character of the neighborhood. The artwork is located in the traffic median on the east side of the North Avenue Bridge. Milwaukee Journal Sentinel architecture critic Whitney Gould called the project, "part sculpture, part signpost."

References