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During the 1870s, the French optician Jules Duboscq devised this elegant instrument to project images from a horizontal surface onto a vertical screen
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A similar overhead projector, on the design of Henry Morton of the Stevens Institute of Technology in Hoboken, New Jersey, sold in this period as a "vertical lantern."
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The concept of the overhead projector was taken from the concept of what in the 1900’s was called the “magic lamp” or the opaque projector
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The opaque projector used to a bright light to shine through a non-transparent object and with the help of mirror projected an image on the screen
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In the 1960s, technical improvements, government funds, advertising, and the experience of teachers combined to make these projectors a popular teaching aid.
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The overhead projector had not seen its highest use until the device was modernized in the 1960s
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Overhead projectors were introduced into U.S. military training during World War II, and used at schools like the U.S. Military Academy after the war.
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