File:A manual of human physiology, including histology and microscopical anatomy, with special reference to the requirements of practical medicine (1885) (14779050924).jpg

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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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Fig. 67. Instrument for measuring the velocity of the pulse-wave in an elastic tube con-taining water or mercury—A, tuning-fork; B, ampulla; A, elastic tube; P,glass-plate smoked; Q, manometer; x, pad of lever of angiograph; writing-style, D. 154 VELOCITY or THE PULSE-WAVE IN MAN. 7 mm. diameter. If 1 metre of the tube is weighted with 1 kilo, it elongates 68cmtr. An ampulla, B, capable of containing 50 cmtr., is fixed to one end of thetube, while to the other end of the ampulla is fixed a mercurial manometer, Q.
Text Appearing After Image:
Fig. 67«. Pulse-curve from an elastic tube registered upon a plate attached to a vibrating tuning-fork. The tube, A, is shut close to the ampulla every time the pressure is mea-sured, in order to obviate the occurrence of oscillation in the mercury. A certainportion of the tube, say 8 metres, is measured. The beginning, a, and end, b,of this stretch of tubing are placed under the pad, x , of the angiograph. Whena positive wave is produced by compressing the ampulla, the writing-lever is raisedtwice, the first time when the wave passes the first part of the tube, o, under thepad, and the second time when the end part of the tube, b, is distended by thewave. The curve obtained is shown in Fig. 67«, in which the two elevations,1 and 2, are obvious. The time between the two may be ascertained by countingthe number of vibrations of the tuning-fork. The experiments gave the followingresults:— (A.) The velocity of the wave is 11809 metres per sec. (B.) The intra-vascular pressure has a d

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Volume
InfoField
v. 1
Flickr tags
InfoField
  • bookid:manualofhumanphy01land
  • bookyear:1885
  • bookdecade:1880
  • bookcentury:1800
  • bookauthor:Landois__L___Leonard___1837_1902
  • bookauthor:Stirling__William__1851_1932
  • booksubject:Physiology
  • booksubject:Histology
  • bookpublisher:Philadelphia__P__Blakiston__Son__and_Company
  • bookcontributor:MBLWHOI_Library
  • booksponsor:MBLWHOI_Library
  • bookleafnumber:191
  • bookcollection:biodiversity
  • bookcollection:MBLWHOI
  • bookcollection:blc
  • bookcollection:americana
  • BHL Collection
  • BHL Consortium
Flickr posted date
InfoField
30 July 2014

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