Essay about blackboard

Choose one of the assigned screening questions or possibly several to guide your analysis of a single scene. You may refer to the full range of formal devices we have discussed so far as well as broader elements of historical and cultural context that can be extrapolated from the film.

Essay about blackboard

Students writing on a blackboard in a village school in LaosA modern chalkboard, A blackboard can simply be a board painted with matte dark paint usually black, occasionally 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 blackboards are made of a rougher version porcelain enamelled steel black, green, blue or sometimes other colours. Porcelain is very hard wearing and blackboards made of porcelain usually last 10—20 years in intensive use.

Manufacturing of slate blackboards began by the s. Green chalkboards, generally made of porcelain enamel on a steel base, first appeared in the s. Magnetic blackboard used for play and learning at the children's museum, Kitchener, Canada The MuseumTeacher explaining the decimal system of weights using a blackboard, Guinea-BissauLecture theatres may contain a number of blackboards in a grid arrangement.

The lecturer then moves boards into reach for writing and then moves them out of reach, allowing a large amount of material to be shown simultaneously. The chalk marks can be easily wiped off with a damp cloth, a sponge or a special blackboard eraser usually consisting of a block of wood covered by a felt pad.

However, chalk marks made on some types of wet blackboard can be difficult to remove. Blackboard manufacturers often advise that a new or newly resurfaced blackboard be completely covered using the side of a stick of chalk and then that chalk brushed off as normal to prepare it for use.

Advantages and disadvantages[ edit ] As compared to whiteboardsblackboards still have a variety of advantages: Chalk requires no special care; whiteboard markers must be capped or else they will dry out. Chalk is an order of magnitude cheaper than whiteboard markers for a comparable amount of writing.

It is easier to draw lines of different weights and thicknesses with chalk than with whiteboard markers. Dashed lines can be drawn very quickly using a technique involving the friction of the chalk or chalk marker and blackboard.

Chalk has a mild smell, whereas whiteboard markers often have a pungent odor. Chalk writing often provides better contrast than whiteboard markers.

Chalk can be easily erased; writing which has been left on a whiteboard for a prolonged period may require a solvent to remove. Chalk can be easily removed from most clothing; whiteboard markers often permanently stain fabric, wood wood frameetc.

Chalk is mostly biodegradablewhereas most plastic recyclers will not take whiteboard markers. On the other hand, chalk produces dust, the amount depending on the quality of chalk used.

Some people find this uncomfortable or may be allergic to it, and according to the American Academy of Allergy, Asthma and Immunology AAAAIthere are links between chalk dust and allergy and asthma problems.

The writing on blackboards is difficult to read in the dark. Chalk sticks shrink through use, and are notorious for breaking in half unless inserted in a writing utensil designed for chalk.

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The scratching of fingernails on a blackboardas well as other pointed, especially metal objects against blackboards, produces a sound that is well known for being extremely irritating to most people. According to a study run by Michael Oehler, a professor at the University of Media and Communication in Cologne, Germany, humans are "predisposed to detest" the sound of nails on a blackboard.

The study earned Blake a Ig Nobel Prize. They use black tablets for the children in the schools, and write upon them along the long side, not the broadside, writing with a white material from the left to the right.Essay software engineering day thesis definition essay difference.

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Blackboard Essays

I am a blackboard. My friends and I were born in a factory using machines. We all were kept in boxes and these were kept in a van. We were bought by different shopkeepers. Aug 27,  · 2.

Essay about blackboard

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