Abstract
A small, portable instrument to measure oral or nasal air flow during speech for both diagnostic and therapeutic purposes. The instrument provides a receptor at one end communicating by an elongate air passageway to a vertical measuring cylinder carrying a sphere vertically movable therein responsive to air flowing therethrough. The vertical position of the sphere in the measuring cylinder indicates amount of air flow and its change in vertical position indicates change in outflow through the receptor at any particular time. Parameters of the instrument may be varied to maintain measurements within the height limitation of the measuring cylinder, and the cylinder may be calibrated for absolute measuration.
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