Galileo's Instruments of Discovery
With these various instruments, Galileo Galilei was able to look into space and change our view of the universe.
- By Sarah Zielinski
- Smithsonian.com, July 20, 2009
Another instrument used in surveying, the graphometer could be used to measure angles up to 180 degrees and determine, through triangulation, distances at land and sea. The device was introduced in 1597 by a Frenchman and was particularly popular in France. This graphometer is from the 17th century.