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Some historians, consider walls with paintings board that men used.
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James Pillans, a Scottish History teacher is known as the inventor of the blackboard because he placed a students clapboard in a wall, this way students would have a better view.
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They were used by students to write lessons and exercises. They made of slate (the sedimentary rock).
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They were invented in the 1960s. They were not really popular because they were expensive, they were invented to prevent health problems from inhaling the dust of the chalk.
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They're a mix between a computer, a video projector and a whiteboard. They work with digital pens. With this device you can work with a video, photo or file on the whiteboard.
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All these types of boards except the clapboard are still used in schools.
