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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 Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.
Romani ite domum on a reconstruction of a Roman settlement in Britain, in the Hull and East Riding Museum. Writing lines is frequently satirised in popular culture as "a symbol of futile, old-fashioned, one-size-fits-all schoolhouse discipline", as in the chalkboard gag seen at the beginning of many episodes of The Simpsons, where Bart Simpson writes lines on a chalkboard as a punishment.
Simon in the Land of Chalk Drawings is a British-Canadian children's animated series about the adventures of a young boy named Simon, who has a magic blackboard. [2] Things that Simon draws on the chalkboard become real in the Land of Chalk Drawings, a parallel world which Simon can enter by climbing over a fence near his home with a ladder.
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 physiological effects).
[1] [5] Most of the photographs show the chalkboard in a moment drawn from the mathematician's work on it, [1] depicting how mathematicians think, work, and communicate with each other. [5] Some other photographs show chalk drawings that were deliberately created to be photographed for this book. The mathematicians themselves are not depicted. [1]
By the nineteenth century, writing slates were used around the world in nearly every school and were a central part of the slate industry. At the dawn of the twentieth century, writing slates were the primary tool in the classroom for students. In the 1930s (or later) writing slates began to be replaced by more modern methods. [5]
A chalkboard eraser (sometimes known as a duster in India and elsewhere [1] [2]) is a special type of eraser specifically used to erase chalk markings on slating paint (used on chalkboards and slates). It is most commonly made of felt strips attached to a handle. Chalkboard erasers are typically broad and rectangular, intended to clear large ...
Chalkboard paint is a specialized paint that creates a chalkboard-like coating that can be utilized as a writing surface in the same manner as a traditional chalkboard. Chalkboard paint is commonly made out of a mixture of talc , [ 1 ] [ 2 ] acrylic , [ 1 ] water , glycol , titanium dioxide , [ 3 ] carbon black , [ 4 ] opacifiers , silica , [ 2 ...