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Dr. Eugene D. Brand and Harry S. Marshall, the Grass Polygraph (Left), and the Dual Beam Oscilloscope and Camera (Right)

Format
Online; Visual Materials
Type
Nonprojected Graphic
Summary
From caption accompanying picture in UVa Medical Alumni News Letter, October-November 1958: "Dr. Eugene D. Brand and Harry S. Marshall [of Pharmacology Department] observe recordings made from the cardiovascular and central nervous systems of an animal as it develops irreversible hemorrhagic shock. Changes in the animals are measured by the Grass Polygraph (left) and the dual beam oscilloscope and camera (right). "These devices operate on the same principal but the speed of response of the oscilloscope is much greater. They can amplify and rec ord electric currents originating either in the animal (electrocardiogram, electroencephalogram, nerve or impluse) or in physical or chemical phenemena (temperature by means of thermocuoples, oxygen tension by the platinum electrode method, etc.). "By means of transducers (whose electrical resistance changes with changes in the variable being measured) and a Wheatstone bridge, they can record physical phenomena such as pressures, volumes, tensions, movement, temperature, and light transmittance."
Series
UVa Medical Alumni News Letter
Date Created
1958
Description
Original Negative Present
Collection
University of Virginia Visual History Collection
Location
Historical Collections & Services, Claude Moore Health Sciences Library, Charlottesville, Va.
Retrieval ID
prints20529
Call Number
RG-30/1/10.011
In Copyright - Education Use PermittedIn Copyright - Education Use Permitted
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