There isn't a single machine that "graphs earthquakes." Instead, a network of instruments called seismometers are used to detect and record earthquake waves.

Here's how it works:

* Seismometers are sensitive instruments that measure ground motion. They work by detecting the tiny vibrations caused by seismic waves.

* Data from multiple seismometers is then transmitted to a central location where it is processed and analyzed.

* Scientists use specialized software to create graphs and maps that show the location, magnitude, and intensity of earthquakes.

So, while there isn't a single machine named "earthquake grapher," the combination of seismometers, data processing, and software allows us to visualize and understand earthquakes.