Johannes Hevelius
Johannes Hevelius (1611–1687) created the first world's great astronomical observatory equipped with telescopes. Hevelius was also a physicist because he discovered centuries old changes in magnetic declination. He was technician too, because he constructed Poland's first pendulum clock, conceived, designed and built the first world's periscope, as well as the first micrometer screw which belongs today to the Gdańsk City Council.