the first magnetic compasses were used by chinese ships in 1040 -- 44.
the first magnetic compasses were used by chinese ships in 1040 -- 44.
when were the first magnetic compasses used by chinese ships?
1040 -- 44
Na
Na
although geophysics was only recognized as a separate discipline in the 19th century, its origins date back to ancient times. the first magnetic compasses were made from lodestones, while more modern magnetic compasses played an important role in the history of navigation. the first seismic instrument was built in 132 ad. isaac newton applied his theory of mechanics to the tides and the precession of the equinox; and instruments were developed to measure the earth's shape, density and gravity field, as well as the components of the water cycle. in the 20th century, geophysical methods were developed for remote exploration of the solid earth and the ocean, and geophysics played an essential role in the development of the theory of plate tectonics.
geophysics