pneumographn.

1868 Lancet 6 June 724/2 The sphygmograph, the cardiograph, the pneumograph marked the movements of the pulse, the heart, and the respiration.

1877 M. Foster Text Bk. Physiol. ii. ii. 222 The pneumograph of Fick is somewhat similar.

1893 Cent. Mag. Aug. 553/1 This [investigation] was done by means of a pneumograph, an instrument which writes the movement of the chest on the paper covering of a revolving cylinder, inspiration being marked by a downward tracing, and expiration by an upward tracing.

1920 Amer. Jrnl. Physiol. 52 209 During the period of forced respiration the subject, with thoracic and abdominal pneumographs attached, was lying on his back, and breathed as deeply as possible in time with a metronome at the rate of about 14 per minute.

1978 D. Bloodworth Crosstalk xxxii. 249 This is the pneumograph... When the subject breathes, the tube expands and contracts, and the changes in pressure are recorded on the chart by this pen.

2003 St. Petersburg Times (Florida) (Nexis) 6 July (Late Tampa ed.) (Tampa & State section) 7 b Pneumographs are bands placed around the chest and stomach that measure breath rate. As air inside the tubes is displaced with each breath, the frequency and amount is converted into a digital signal.

1927 Lancet 31 Dec. 1401/2 In some cases the ‘pneumographs’ gave evidence of atrophy of the frontal convolutions.

1948 E. Lysholm & J. Bull in J. W. McLaren Mod. Trends Diagnostic Radiol. xxiv. 322 The composite pneumographs have also been measured planimetrically in relation to the corresponding brain cross-sections.