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Galileo Galilei invented the geometric and military compass. It was his first commercial scientific instrument. (Franklin Institute)

Galileo's Instruments of Discovery

With these various instruments, Galileo Galilei was able to look into space and change our view of the universe.

Geometrical Square

Galileo geometrical square
(Franklin Institute)

This square could be used either vertically, as shown, or horizontally to measure heights and distances through triangulation. It also had a magnetic compass to determine direction. This square is from the 16th century.

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