Gas Chamber
Using the gas chamber for execution, the prisoner is strapped to a chair in an airtight chamber. Below the chair is a bucket of sulfuric acid. A long stethoscope is typically fixed on the inmate so that a doctor outside the chamber can pronounce death. Once everyone has left the chamber, the room is sealed. The warden then gives a signal to the executioner who flicks a lever that releases crystals of sodium cyanide into the pail. This causes a chemical reaction that releases hydrogen cyanide gas. The prisoner is told to breathe deeply to speed up the process.
Most prisoners, however, try to hold their breath, and some struggle. The inmate does not lose consciousness immediately. At first there is evidence of extreme horror, pain, and strangling. The eyes pop. The skin turns purple and the victim begins to drool.
