A chalkboard, with multiple colors of chalk

Blackboard Chalk

A quadruple chalkboard at the Helsinki University of Technology

A chalkboard or blackboard is a reusable writing surface on which text or drawings are made with chalk or other erasable markers. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone. Sometimes they are green (especially early elementary) or brown (especially at universities) and thus sometimes called a greenboard or brownboard instead. a chalkboard File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... a chalkboard File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Wikipedia does not have an article with this exact name. ... Wikipedia does not have an article with this exact name. ... Image File history File links Download high resolution version (1200x900, 147 KB) A mathematics lecture, apparently about linear algebra, at Helsinki Univeristy of Technology - TKK. File links The following pages link to this file: Mathematics University Student Lecture ... Image File history File links Download high resolution version (1200x900, 147 KB) A mathematics lecture, apparently about linear algebra, at Helsinki Univeristy of Technology - TKK. File links The following pages link to this file: Mathematics University Student Lecture ... Helsinki University of Technology (TKK) (Finnish: Teknillinen korkeakoulu; Swedish: Tekniska högskolan) is the premier technical university in Finland and the largest in the Nordic Countries with over 15000 students. ... Illustration of a scribe writing Writing, in its most common sense, is the preservation of and the preserved text on a medium, with the use of signs or symbols. ... The Needles,situated on the Isle Of Wight, are part of the extensive Southern England Chalk Formation. ... Slate Slate Macro Slate roof Slate is a fine-grained, homogeneous, metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low grade regional metamorphism. ...

A blackboard can simply be a piece of board painted with matte dark paint (usually black or dark green). A more modern variation consists of a coiled sheet of plastic drawn across two parallel rollers, which can be scrolled to create additional writing space while saving what has been written. The highest grade chalkboards are made of a rougher version porcelain enameled steel (black, green, blue or sometimes other colours). Porcelain is very hard wearing and chalkboards made of porcelain usually last 10-20 years in intensive use. This page is a candidate to be moved to Wiktionary. ... This article does not cite any references or sources. ...

Blackboards are commonly used in teaching. The chalk marks can be quickly and easily wiped off with a damp cloth or a special blackboard eraser consisting of a block of wood covered by a felt pad. Chalkmarks made on some types of wet blackboard can be difficult to remove. Blackboard manufacturers often advise that a new or newly resurfaced chalkboard be completely covered using the side of a stick of chalk and then that chalk brushed off as normal to prepare it for use. In education, teachers are those who teach students or pupils, often a course of study or a practical skill. ... A pencil eraser. ...

Sticks of processed "chalk" are made especially for use with blackboards in white and also in various colours. These are not actually made from chalk rock but from gypsum. This balancing rock, Steamboat Rock stands in Garden of the Gods park in Colorado Springs, CO The rocky side of a mountain creek near Orosí, Costa Rica. ... It has been suggested that Selenite be merged into this article or section. ...

Blackboards have disadvantages: they produce a fair amount of dust, depending on the quality of chalk used. Some people find this uncomfortable or may be allergic to it, and there has been speculation about links between chalk dust and respiratory problems. The dust also precludes the use of chalk in areas shared with dust-sensitive equipment such as computers. These disadvantages have led to the widespread adoption of the whiteboard, which uses ink markers that produce almost no dust. However, these alternative methods of displaying information have drawbacks of their own. This article needs cleanup. ... // In animal physiology, respiration is the transport of oxygen from the ambient air to the tissue cells and the transport of carbon dioxide in the opposite direction. ... The NASA Columbia Supercomputer. ... A small whiteboard with pen and eraser clipped to top A whiteboard (also called a dry-erase or dry-wipe board) is the name for any glossy surface, most commonly coloured white, where markings can be made. ...

The scratching of fingernails on a blackboard is a sound that is well-known for being extremely irritating. This article discusses the anatomical nail. ...

Blackboards are also used in many establishments (typically Public Houses) as a form of advertising often for upcoming events and menus - as well as to keep the score in Darts Matches. This article or section is not written in the formal tone expected of an encyclopedia article. ... A standard dart board. ...

History

The chalkboard was introduced around 1801^[1]. The term "blackboard" was invented about 1820, while the newer term "chalkboard" was first coined in the 1930s.^[2].

References

1. ^ The Cato Education Market Index.
2. ^ Dictionary.com Unabridged (v 1.0.1).

See also

• Sidewalk chalk
• Whiteboard
• Chalkboard gag from The Simpsons.
• Chalkzone

Sidewalk chalk is large colored chalk used mostly by children in a variety of activites, but is mostly restricted to drawing on pavement or cement sidewalk. ... A small whiteboard with pen and eraser clipped to top A whiteboard (also called a dry-erase or dry-wipe board) is the name for any glossy surface, most commonly coloured white, where markings can be made. ... Bart writes The Pledge of Allegiance does not end with Hail Satan The chalkboard gag is a running visual joke that occurs during the opening credits of many episodes of The Simpsons. ... Simpsons redirects here. ... ChalkZone was an American animated television series, produced by Frederator Studios for the Nickelodeon cable channel. ...

External Links

• Examples of Blackboard styles

Look up chalkboard in Wiktionary, the free dictionary.