. Advanced lessons in practical physiology for students of medicine. Physiology. Fig. 84.—Pneumograph. (Harvard Apparatus Co.) Annotation.—As the name indicates, a jugular cup consists of a hemispheric capsule of metal or glass which is placed flat against the region of the central end of the external jugular vein. The pulsations of tlais blood-vessel are transmitted to a recording drum. 4. Relation Between the Cardiac and Respiratory Activities.—Ad- just a stethograph upon the chest of the subject and connect it with a recording tambour. Place a receiving cup over the region of the carotid ar
. Advanced lessons in practical physiology for students of medicine. Physiology. Fig. 84.—Pneumograph. (Harvard Apparatus Co.) Annotation.—As the name indicates, a jugular cup consists of a hemispheric capsule of metal or glass which is placed flat against the region of the central end of the external jugular vein. The pulsations of tlais blood-vessel are transmitted to a recording drum. 4. Relation Between the Cardiac and Respiratory Activities.—Ad- just a stethograph upon the chest of the subject and connect it with a recording tambour. Place a receiving cup over the region of the carotid artery and connect it with a recording drum arranged to register in the. Fig. 85.—Marey's Pneumograph. (Verdin.) The instrument consists of a tambour (0, mounted on a flexible metal plate (p). By- means of the bands c and c the metal plate is tied to the chest. Any increase or decrease in the size of the chest will then affect the tambour by the lever arrangement shown in the figure. These changes in the tambour are transmitted through the tube r as pressure changes in the contained air to a second tambour (not shown in the figure) which records them upon a smoked drum. (Howell.) same vertical line as the former. Beneath these writing levers adjust the marker of a Jaquet chronograph. While the subject assumes a perfectly inattentive attitude, record a number of respiratory cycles upon a drum revolving at a moderate speed. How many cardiac cycles does each respiratory cycle embrace? Do you observe an increase in the cardiac frequency on inspiration? Explain this variation. Annotation.—A simple stethograph may be made by fastening a small rubber pouch by means of a broad linen strap against the chest. The single orifice of this pouch is connected Vjy means of a cannula and a piece of rubber tubing with a record-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these i
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphysiology, bookyear1
