From Carnegie Institution of Washington Publication, Issue 216, Comparisons of Respiratory Exchange, 1915, page 68.
Category Archives: Valve
Valve, Briggs, 1920
Brigg’s breathing valves, used in mine rescue equipment. From The Department of Scientific and Industrial Research, Advisory Council, Second Report of the Mine Rescue Apparatus Committee, Published by His Majesty’s Stationary Office, 1920, page 48.
Haldane’s Equalizing Apparatus, 1920
Haldane’s equalizing arrangement used in testing mine safety equipment. From The Department of Scientific and Industrial Research, Advisory Council, Second Report of the Mine Rescue Apparatus Committee, Published by His Majesty’s Stationary Office, 1920, page 38.
Valve, Mueller, 1920
A Mueller breathing valve. From The Department of Scientific and Industrial Research, Advisory Council, Second Report of the Mine Rescue Apparatus Committee, Published by His Majesty’s Stationary Office, 1920, page 32.
Valve, Rosling, 1920
A Rosling breathing valve. From The Department of Scientific and Industrial Research, Advisory Council, Second Report of the Mine Rescue Apparatus Committee, Published by His Majesty’s Stationary Office, 1920, page 31.
Valve, Split-Tube, 1920
A split-tube breathing valve. From The Department of Scientific and Industrial Research, Advisory Council, Second Report of the Mine Rescue Apparatus Committee, Published by His Majesty’s Stationary Office, 1920, page 31.
Douglas Bag, 1920, used to test valves
A Douglas bag system to test the efficiency of breathing valves. From The Department of Scientific and Industrial Research, Advisory Council, Second Report of the Mine Rescue Apparatus Committee, Published by His Majesty’s Stationary Office, 1920, page 30.
Collins 5-way valve. Used for DLCO testing before automated valves had been developed. The patient mouthpiece was attached to the opening in the center. A rubber alveolar sample bag was attached to the small port at the bottom. The knob on the rear side was used by the technician to step the patient through the different stages of the test. Found on an Ebay listing.
Valves, Flutter, 1934
Found at Europeana.Eu. From an educational film entitled “Methods of measuring metabolism and basal metabolism Krogh and Douglas bag”, Produced by the Department of Physiology, Cambridge University, 1934.
A pair of flutter valves inside glass. Intended to be used to measure minute ventilation with a Douglas bag.
Douglas Bag Valve, 1934
Found at Europeana.Eu. From an educational film entitled “Methods of measuring metabolism and basal metabolism Krogh and Douglas bag”, Produced by the Department of Physiology, Cambridge University, 1934.
The action of the valve attached to the Douglas bag was being demonstrated.