Spirometer, McKesson Vitalor, 1965

Spirometer_McKesson_Vitalor_1965

From: US Naval Air Development Center, Document NADC-MR-6516, “Post-flight chest discomfort in aviators: aero-atelectasis”, by Elihu York, page 3, 12/30/1965.  The McKesson Vitalor was a dry wedge bellows spirometer.  A pen attached to the top of the bellows marked on a small sheet of graph paper that was attached to an electric motor-driven platen.  In this picture the subject is exhaling directly into the mouthpiece that was permanently attached to the front of the spirometer.

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