From: Bellows spirometer and transistor timer for the measurement of forced expired volume and vital capacity. By M.M Collins, M. McDermott and T.J. McDermott. Proceedings of the Physiological Society, Cardiff Meeting, April 17-18 1964. Page 39P.
From: Bellows spirometer and transistor timer for the measurement of forced expired volume and vital capacity. By M.M Collins, M. McDermott and T.J. McDermott. Proceedings of the Physiological Society, Cardiff Meeting, April 17-18 1964. Page 39P.