An Ancient Earthquake Detector
Today, seismologists use sensitive equipment to record tectonic movements deep within the earth and analyze this data to predict earthquakes. Although seismometers are becoming more advanced each year, accurately predicting earthquakes is still an inexact science. More than 2,000 years ago, however, an ancient Chinese inventor, Zhang Heng, made the world’s first seismoscope which proved to be incredibly accurate. Called the Houfeng Didong Yi, Zhang Heng’s seismoscope was made in the shape of ajar with eight tubes extended from a circle of dragon heads on the exterior of the jar. When the device detected an earthquake, a small ball fell out of one of the dragon’s mouths and into the mouth of a toad figure affixed to the base of the jar. The toad indicated the direction the seismic wave was traveling.
When there is drama in the Café. My Wife goes like this.
twenty, not thirty-five.
Thanks in advance!
it's a handsome photograph, I'll give it that, but for now I'd rather date women, thanks.
You're assuming that all frequencies of microwave radiation are dangerous. Tesla lived to a 86 years, despite his exposure to it. Cell phone towers use microwave frequencies.
When there is drama in the Café. My Wife goes like this.
twenty, not thirty-five.
Thanks in advance!
it's a handsome photograph, I'll give it that, but for now I'd rather date women, thanks.
You're assuming that all frequencies of microwave radiation are dangerous. Tesla lived to a 86 years, despite his exposure to it. Cell phone towers use microwave frequencies.