Qin dynasty is incapable of working with measurements.
Before their conquest in the fourth and third centuries BC, the Qin suffered several setbacks
 Science and technology during the Han period saw significant advances, including the process of papermaking, the nautical steering ship rudder, the use of negative numbers in mathematics, the raised-relief map, the hydraulic-powered armillary sphere for astronomy, and a seismometer employing an inverted pendulum that could be used to discern the cardinal direction of distant earthquakes

