Identifier: handbookofphysio00bake (find matches)
Title: Hand-book of physiology
Year: 1892 (1890s)
Authors: Baker, W. Morrant, (William Morrant), 1839-1896 Harris, Vincent Dormer Kirkes, William Senhouse, 1823-1864. Hand-book of physiology. 13th ed
Subjects: Physiology Human physiology
Publisher: London : John Murray
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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of one bar is a tambour and ivory button, to theend of the other an ivory button. When in use, the apparatus is suspendedwith the transverse bar posteriorly, the button of the tambour is placed onthe part of the chest the movement of which it is desired to record, and theother button is made to press upon the corresponding side of the chest, sothat the chest is, as it were, held between a pair of callipers. The tambouris connected by tubing and a J piece with a recording tambour of Mareys,and with a ball, by means of which air can be squeezed into the cavity of thetympanum. When in work the tube connected with the air ball is shut offby means of a screw clamp. The movement of the chest is thus com-municated to the recording tambour. A simpler form of this apparatus, called a pneumograph or stethog-raph,consisting of a thick india-rubber bag of elliptical shape about three inches Tambour.Ivory button. Tube to commu-nicate with re-cording tam-bour. Ball to fill appa- _.ratus with. air.
Text Appearing After Image:
Fig. 215.— Stethometer. (Burdon Sanderson.) long, to one end of which a rigid gutta-percha tube is attached. This bagmay be fixed at any required place on the chest by means of a strapand buckle. By means of the gutta-percha tube the variations of thepressure of air in the bag produced by the movements of the chest are com-municated to a recording tambour. This apparatus is a simplified form ofMareys pneumograph (fig. 214). The variations of intrapleural pressure may be recorded by the intro-duction of a cannula into the pleural or pericardial cavity, which is con-nected with a mercurial manometer. CH. VII.) RHYTHM OF RESPIRATION. 275 Finally, it has been found possible in various ways to record the dia-phragmatic movements by the insertion of an elastic bag connected with atambour into the abdomen below it (phrenograph.), by the insertion ofneedles into different parts of its structure, or by recording the contractionof isolated strips of the diaphragm. The acts of expansion and co

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