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
Pullstring changes the doll's eye color. Other non-doll toys like See 'n Say (1965). The earliest patent with a pullstring included in it is an 1886 "Toy Bowling-Alley". Many motorized lawn mowers, chainsaws, portable generators, and portable outboard motors use a pullstring or pullcord attached to a handle as a manual ignition device. Some vehicle engines are also started with pullchains, such as the early-1900s Puckridge, or pullcords, like the pre-release version of the Citroën 2CV car, and the DKW RT 125 scooter. Some grenades such as the German Models 24, 39, and 43 have pullcords. Some machine guns such as