A British physician, Nahaniel Henshaw, proposed what might have been the main hyperbaric chamber for professional medical treatment of humans in 1662. The metal container was to have already been pressurised with air, which at the time wasn't yet regarded to contain oxygen, later on identified by Carl Wilhelm Scheele https://oxygenchambersfordogs97395.blogsidea.com/42899720/5-essential-elements-for-oxygen-treatment-cost