SPIROMETER
\spɪɹˈɒmɪtə], \spɪɹˈɒmɪtə], \s_p_ɪ_ɹ_ˈɒ_m_ɪ_t_ə]\
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By William Dodge Lewis, Edgar Arthur Singer
By William R. Warner
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Any instrument for measuring the quantity of air concerned in respiration, and, consequently, the capacity of the lungs. This mode of measurement has been called Spirom'etry, as It was formerly called Pulmom'etry. The term spirometer is now usually applied to a kind of gasometer introduced by Dr. Hutchinson to estimate the quantity of air contained in. or, rather, expelled from the lungs under different circumstances.
By Robley Dunglison
By Willam Alexander Newman Dorland