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  2. Blackboard - Wikipedia

    en.wikipedia.org/wiki/Blackboard

    Uses. Reusable writing surface on which text or drawings are made. A blackboard or a chalkboard is a reusable writing surface on which text or drawings are made with sticks of calcium sulphate or calcium carbonate, known, when used for this purpose, as chalk. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.

  3. Chalkboard scraping - Wikipedia

    en.wikipedia.org/wiki/Chalkboard_scraping

    Chalkboard scraping. Scraping a chalkboard (also known as a blackboard) with one's fingernails produces a sound and feeling which most people find extremely irritating. The basis of the innate reaction to the sound has been studied in the field of psychoacoustics (the branch of psychology concerned with the perception of sound and its ...

  4. Chalk - Wikipedia

    en.wikipedia.org/wiki/Chalk

    Composition. Calcite ( calcium carbonate) Chalk is a soft, white, porous, sedimentary carbonate rock. It is a form of limestone composed of the mineral calcite and originally formed deep under the sea by the compression of microscopic plankton that had settled to the sea floor. Chalk is common throughout Western Europe, where deposits underlie ...

  5. Blackboard bold - Wikipedia

    en.wikipedia.org/wiki/Blackboard_bold

    Blackboard bold is a style of writing bold symbols on a blackboard by doubling certain strokes, commonly used in mathematical lectures, and the derived style of typeface used in printed mathematical texts. The style is most commonly used to represent the number sets ( natural numbers ), ( integers ), ( rational numbers ), ( real numbers ), and ...

  6. Writing lines - Wikipedia

    en.wikipedia.org/wiki/Writing_lines

    Writing lines is a long-standing form of school discipline, having survived even as other old punishments such as school corporal punishment and dunce hats fell out of favour in the 20th century. [2] In a 1985 study, over half of respondent teachers in an English-speaking country indicated awareness of the use of writing to discipline students. [5]

  7. Goulston Street graffito - Wikipedia

    en.wikipedia.org/wiki/Goulston_Street_graffito

    Goulston Street graffito. Coordinates: 51°30′59.51″N 0°4′30.14″W. Copy of graffito in Goulston Street, attached to Metropolitan Police Commissioner Sir Charles Warren 's report to the Home Office on the Whitechapel murders. The Goulston Street graffito was a sentence written on a wall beside a clue in the 1888 Whitechapel murders ...

  8. Eraser - Wikipedia

    en.wikipedia.org/wiki/Eraser

    Chalk writing leaves light-colored particles weakly adhering to a dark surface (e.g., white on black, or yellow on green); it can be rubbed off with a soft material, such as a rag. Erasers for chalkboards are made, with a block of plastic or wood, much larger than an eraser for pen or pencil, with a layer of felt on one side.

  9. Free writing - Wikipedia

    en.wikipedia.org/wiki/Free_writing

    Free writing is traditionally regarded as a prewriting technique practiced in academic environments, in which a person writes continuously for a set period of time with limited concern for rhetoric, conventions, and mechanics, sometimes working from a specific prompt provided by a teacher. [1] While free writing often produces raw, or even ...

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