Gas chamber carbon monoxide as the lethal agent. Sometimes a box filled with anesthetic gas is used to anesthetize small animals for surgery or euthanasia. Gas chamber A gas chamber is an apparatus for killing humans or other animals with gas, consisting of a sealed chamber into which a poisonous or asphyxiant gas is introduced. The most commonly used poisonous agent is hydrogen cyanide; carbon dioxide and carbon monoxide have also been used. Gas chambers were used as a method of execution for condemned prisoners in the United States beginning in the 1920s and continue to be a legal execution method in
Southern California Gas Company the Los Angeles Gas Company in 1890. These companies ultimately became Southern California Gas Company. By the early 20th century, natural gas—a colorless, odorless gas found in association with oil underground—was starting to gain attention. The breakthrough came with the discovery of the Buena Vista Oil Field near Taft, California in 1909, which included a huge reservoir of natural gas. Since natural gas had twice the heating value of manufactured gas, the company took the bold step to convert its system to natural gas and build pipelines throughout the state. Natural gas was soon found throughout the country, and demand