Longworth Scientific Instrument Company

Longworth Scientific Instrument Company was a pioneering British medical engineering firm specializing in the design and manufacture of anesthesia equipment. Established in 1943 to commercialize the inventions of the Nuffield Department of Anaesthetics at the University of Oxford, the company became world-renowned for the Oxford Vaporiser and the EMO (Epstein-Macintosh-Oxford) inhaler. These devices were designed to deliver accurate concentrations of anesthetic vapors without requiring compressed gases, making them essential for military use and in resource-limited settings. In 1975, the company was integrated into Penlon, which continues to maintain the legacy of these influential medical technologies.