SPIROGRAPH
Source: 567
Spi″ro‐graph (?), n. [[L. spirare to breathe + -graph.]] (Physiol.) An instrument for recording the respiratory movements, as the sphygmograph does those of the pulse.
Source: 567
Spi″ro‐graph (?), n. [[L. spirare to breathe + -graph.]] (Physiol.) An instrument for recording the respiratory movements, as the sphygmograph does those of the pulse.