In 132 AD, China built a machine that could detect earthquakes hundreds of miles away: How Zhang Heng created the world's first earthquake detection device?
In 132 AD, China built a machine that could detect earthquakes hundreds of miles away through a device created by Chinese scientist Zhang Heng. The machine is known as the first seismograph in history. It used a pendulum, metal dragons, and frogs to detect ground vibrations. The invention helped the…
The Economic Times ·