Observations upon the construction and use of the respirator : an instrument for facilitating respiration, to be worn on the face by persons suffering from coughs, consumption, asthma, and other affections of the chest / [Julius Jeffreys].
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Observations upon the construction and use of the respirator : an instrument for facilitating respiration, to be worn on the face by persons suffering from coughs, consumption, asthma, and other affections of the chest / [Julius Jeffreys]. Credit: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.. Public Domain Mark