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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 Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.
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]
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 ...
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 ...
The writing slate consisted of a piece of slate, typically either 4x6 inches or 7x10 inches, encased in a wooden frame. [1] A slate pencil was used to write on the slate board. It was made from a softer and lighter coloured stone such as shale or chalk. Usually, a piece of cloth or slate sponge was used to clean it and this was sometimes ...
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 ...
Chalking the door. Epiphany season door chalking on an apartment door in Germany. A Christmas wreath adorning a home, with the top left-hand corner of the front door chalked for Epiphany-tide and the wreath hanger bearing a placard of the archangel Gabriel. Chalking the door is a Christian Epiphanytide tradition used to bless one's home, [1 ...
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 ...
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