The risk of explosion due to electrification in operating theatres of hospitals

Cases of ignition of anaesthetic vapours have occurred in hospitals which it has been difficult to account for except as a result of a spark due to unsuspected static electrification of the equipment used in operating theatres. Tests have been carried out in a number of hospitals, and it has been found that electrification of a frictional character, sufficient to produce a spark capable of igniting anaesthetic vapours, can often be generated in a simple manner. Measurements have been made in connection with methods suggested for the reduction of the risk to a negligible quantity. Phenomena are discussed which may lead to ignition due to the use of oxygen at high pressure. The recent development of electrically-conducting rubber promises to afford a valuable preventive of static electrification. A bibliography has been compiled which indicates the seriousness of the risks associated with electrification.