File:A manual of human physiology, including histology and microscopical anatomy, with special reference to the requirements of practical medicine (1885) (14779012254).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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over the heart, andthe other, B, on a distantartery. Landois Angiograph.—Toa basal plate, G, G, are fixedtwo upright supports, p, whichcarry between them at theirupper part the movable lever,d, r, carrying a rod bearing apad, e, directed downwards,which rests on the pulse.The short arm carries a coun-terpoise, d, so as exactly tobalance the long arm. Thelong arm has fixed to it at ra vertical rod provided withteeth, h, which is pressedagainst a toothed wheel firmlyfixed on the axis of the verylight writing-lever, e /, whichis supported between two up-rights, q, fixed to the oppositeend of the basal plate, G, G.The writing-lever is equilibri-ated by means of a lightweight. The writing-needle,k, is fixed by a joint to e, andit writes on the plate, /. Thefirst - mentioned lever, d, r,carries a shallow plate, Q, justabove the pad, into whichweights may be put to weightthe pulse. In this instrumentthe weight can be measuredand varied) the writing-lever moves vertically and not in a curve
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134 CHARACTERS OF A PULSE-CURVE. as iii Mareys apparatus, which greatly facilitates the measuring ofthe curves. (Fig. 53.) Other sphygmographs are used, botli in this country and abroad, including thatof Sommerbrodt, which is a complicated form of Mareys sphygmograph, andthose of Pond and Mach. In choosing a sphygmograph, that instrument is to bepreferred which yields a curve corresponding most closely with the variations of the pressure within the artery, inwhich the resistance of the instrumentis small, which gives the largest curve,and in which the part in contact withthe artery is not greatly displacedfrom its position of equilibrium(Mach). Characters of a Pulse-Curve.—In every pulse-curve—SPHYGMOGRAM or ARTERIOGRAM—we candistinguish the ascending part(ascent) of the curve, the apex,and the descending part (descent).Secondary elevations scarcelyever occur in the ascent, whichis usually represented by astraight line, while they occurconstantly in the descent. Suchelevations o

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