1642 in science

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The year 1642 in science and technology involved some significant events.

Technology

The printmaking process of mezzotint is developed by Ludwig von Siegen.
The Pascaline, one of the earliest mechanical devices for calculating, is invented by Blaise Pascal to help with the recording of taxes.

Abel Janzoon Tasman, Dutch explorer, sights Tasmania, which he names Anthony Van Dieman's Land.