Beard reducing valve,1888. Valves such as this were used to regulate the pressure of anaesthetic gases,such as oxygen and nitrous oxide,from pressurised gas cylinders. The valves allowed control of the pressure of gases reaching the patient during general anaesthesia. Compressed gases in cylinders were introduced in the late 19th century. The valve has been cut away to show the internal mechanism | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library |
Bildgröße: | 3417 px × 5114 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |