A respirometer for measuring the rate of an air flow of respiration includes a hot wire in a path of the air flow. For measuring the rate of the air flow with a discrimination made between the senses of the air flow, a pair of temperature sensitive elements are placed in the path of the air flow on respective...http://www.google.es/patents/US3962917?utm_source=gb-gplus-sharePatente US3962917 - Respirometer having thermosensitive elements on both sides of a hot wire
Respirometer having thermosensitive elements on both sides of a hot wire
