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Individual slates were used in classrooms during the early 1800s.
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The classroom blackboard was first introduced.
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The magic lantern projected images on glass plates.
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The three dimensional devices, which were popular in home parlors, were sold to schools featuring educational sets containing hundreds of images.
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Charles Urban of London began exhibiting the first educational films.
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Radio entered the educational system in the early 1920s.
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Typewriters were introduced to schools in the 1920’s.
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The first documented use of closed circuit television was in Los Angeles public schools and at the State University of Iowa in 1939.
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Computers were first used in education in the 1960s in a way that was intended to individualize instruction.
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Teachers use data or simulations available on the Internet to demonstrate a concept or work through a problem with the whole class.
