File:A manual of human physiology, including histology and microscopical anatomy, with special reference to the requirements of practical medicine (1885) (14779149164).jpg

Identifier: manualofhumanphy01land (find matches)
Title: A manual of human physiology, including histology and microscopical anatomy, with special reference to the requirements of practical medicine
Year: 1885 (1880s)
Authors: Landois, L. (Leonard), 1837-1902 Stirling, William, 1851-1932
Subjects: Physiology Histology
Publisher: Philadelphia, P. Blakiston, Son, and Company
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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p. 132 (Rosenthal). Mareys StethOgraph or Pneumograph.â(There are two forms of this instru-ment, one modified by P. Bert and the more modern form (Fig. 102). A tambour (h)is fixed at right angles to a thin elastic plate of steel (/). The aluminium disc onthe caoutchouc of the tambour is attached to an upright (b), whose end lies in con-tact with a horizontal screw (#). Two arms (d, c) are attached to opposite sides ofthe steel plate, and to them the belt (c) which fastens the instrument to the chestis attached. When the chest expands these two arms are pulled asunder, the steelplate is bent and the tambour is affected, and any movement of the tambour istransmitted to a registering tambour by the air in the tube (a).) In the case of animals placed on their backs, Snellen introduced a long needlevertically through the abdominal walls into the liver. Rosenthal opened theabdomen and applied a lever to the under surface of the diaphragm, and thus regis-tered its movements (PHREXOGRAPH).
Text Appearing After Image:
Fig. 104. Pneumatogram obtained by means of Riegels StethographâI, normal curves; II,curve from a case of emphysema; a, ascending limb; b, apex; c, descendinglimb of the curve. The small elevations are due to the cardiac impulse. The curve (Fig. 103, B) was obtained by placing the tambour of aBrondgeests pansphygmograph upon the xiphoid process, and recording 232 TYPE OF RESPIRATION. the movement upon a plate attached to a vibrating tuning-fork. Theinspiration, (ascending limb) begins with moderate rapidity, is acceleratedin the middle, and towards the end again becomes slower. The expira-tion also begins with moderate rapidity, is then accelerated, and becomesmuch slower at the latter part, so that the curve falls very gradually. Inspiration is slightly shorter than expiration.âAccording to Sibson,the ratio for an adult is as G to 7; in women, children, and old people,6 to 8or G to 9. Vierordt found the ratio to be 10 to 141 (to 241);J. E. Ewald, 11 to 12. It is only occasionally

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