A text-book of physiology, for medical students and physicians . Fig. 257.—Figure of Mareys pneumograph.—(Verdin.) The instrument consists ofa tambour (/), mounted on a flexible metal plate (p). By means of the bands c and cthe metal plate is tied to the chest. Any increase or decrease in the size of the chest willthen affect the tambour by the lever arrangement shown in the figure. These changes inthe tambour are transmitted through the tube r as pressure changes in the contained airto a second tambour (not shown in the figure) which records them upon a smoked drum. does not record the pause,
A text-book of physiology, for medical students and physicians . Fig. 257.—Figure of Mareys pneumograph.—(Verdin.) The instrument consists ofa tambour (/), mounted on a flexible metal plate (p). By means of the bands c and cthe metal plate is tied to the chest. Any increase or decrease in the size of the chest willthen affect the tambour by the lever arrangement shown in the figure. These changes inthe tambour are transmitted through the tube r as pressure changes in the contained airto a second tambour (not shown in the figure) which records them upon a smoked drum. does not record the pause, if any, at the end of inspiration or ex-piration. A modification of this method that permits an accuraterecord of the amplitude and duration of the movements consists inconnecting the trachea or nostrils with a large bottle of air. Theanimal breathes into and out of the bottle, and the corresponding. Fig. 268. Curve of QOimal respiratory movements.—(Marc//.) Curve A, full line,repret«Mii the movements when the re piration is entirely normal. Downstroke, Inspira-tion; upstroke, expiration. Curved dotted line, represents the increased amplitude f the movement , light i ..I by l>n-;i I liing through a narrow tube. variations in pressure are recorded by a tambour also connectedwith the interior of the bottle. (3) Methods in which the change of pressure in the thoracic cavity 18 recorded. This end may bereached by inserting a cannula into the thoracic wall so that itsopening lies in the pleural cavity, or, more simply, a catheter orSOUnd Connected .it I In- Other end to a tambour may be passed down EXTERNAL RESPIRATION AND RESPIRATORY MOVEMENTS. 631 the esophagus until its end lies in the intrathoracic in pressure in the mediastinal space synchronous withthe respiratory movements affect the esophagus and through itthe sound. (4) Methods in which the move
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