What is a Richter scale?
What is a Richter scale?
user
It’s a measurement of how much energy an earthquake releases.  It is named after Charles Richter who originally invented the scale, back in the 1930s.
assistant
How did Charles Richter invent the Richter scale?  Was he helped by others?
user
In essence he created the scale by sorting through some graphs of how many people and things felt the earth shake, and then drawing a line between those dots to make a graph.  In that way he was able to show the relationship between the amount of energy released and the amount of perceived shaking.  However, the scale didn’t originally include the 9.0 value.  This came later with the development of more sensitive seismometers.  But even today most seismographs only record numbers between 1 and 10.  A new attempt at a more sensitive seismometer recently achieved a value of 9.2.
assistant
Did he get a patent for the scale?
user
No, he did not.  The scale was a scientific discovery rather than a product or service.
assistant
So, what disaster is usually measured by the Richter scale?
user