File:American journal of physiology (1898) (14783129035).jpg

Identifier: americanjourna33ameruoft (find matches)
Title: American journal of physiology
Year: 1898 (1890s)
Authors: American Physiological Society (1887- ) American Physiological Society (1887- ). Abstracts of papers presented at the fall meeting American Physiological Society (1887- ). Proceedings
Subjects: Physiology Physiology
Publisher: (Bethesda, Md., etc.) American Physiological Society (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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tion frequency, and in order to obtain correct quantitativecurves it is important to keep the cannula free from a coagulumand to keep the instrument approximately aperiodic for the pres-sure changes involved. A new manometer meeting the demandsboth of accuracy and convenience was therefore devised. It consists (Figs, i and 2) of a vertical glass tube (A) sur-mounted by a hollow brass cylinder (B). This contains a stop- • Wiggers: Proceedings of the society for experimental biology andmedicine, 1913, xi, p. 11. The Pressure Curve in the Right Ventricle 385 cock (C) with a conical lumen, the truncated cone of which comesinto apposition with a damping plate (a) having an opening 2 mm.in diameter. By giving the stopcock a shght turn the instru-ment can be rendered almost aperiodic to suit any membrane orany pressure change by increasing the damping practically at onepoint. Above the damping plate the cylinder ends in a segmentcapsule (b) (3 mm. in diameter) covered with rubber dam. Upon
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Figure 1. Optical manometer, letters referred to in text. this a small piece of celluloid carrying a little Zeiss mirror (2x4mm.) (c) is fastened so that it pivots on the chord side of thesegment capsule. Over the segment capsule and its recordingmirror is mounted a support (D) bearing an inclined reflectingmirror (E) adjustable about an horizontal axis by a screw (F) sothat the image of the recording mirror appears within it. Uponthis image the band of light from a Nernst or an arc light isfocused. The incident rays are doubly reflected as shown in thediagram of Fig. 2. For quantitative work the instrument is calibrated withreference to a streak of light projected by a second small mirror(G) fastened to one arm of the support and adjusted to the side 386 Carl J. Wiggers

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