Bauhaus-Universität Weimar

Cambridge Physiological Instruments: Booklet No. V, Cambridge Instrument Co., Ltd.
THE Electro- 
Cardiograph has 
been developed 
for pathological in¬ 
vestigations in connec¬ 
tion with the study of 
the human heart. It 
enables the extremely 
minute electrical cur¬ 
rents set up by the 
auricular and ventri¬ 
cular contractions to 
be measured and their 
fluctuations recorded 
upon a photographic plate or on a strip of photographic paper. 
Derangements in the heart’s action can thus be detected, the 
results providing a check upon diagnosis, and forming a valuable 
aid to prognosis and treatment. Accurate records are easily 
and quickly obtained—a complete series of three curves can be 
taken from a patient’s heart in a few minutes. The apparatus 
comprises an Einthoven string galvanometer, connected to the 
patient through the intermediary of suitable electrodes, together 
with illuminating and optical devices, whereby the movements 
of the galvanometer fibre are photographically recorded on a 
moving sensitized surface. The Einthoven string galvanometer 
is illustrated in Fig. 13. The moving system is a fine conducting 
fibre which is stretched in the narrow gap between the poles of 
a powerful electro-magnet. When the minute electrical currents 
from the heart are passed through the fibre it is deflected at 
right angles to the magnetic field and to the direction of the 
Fig. 13. 
17 X 10 X 10 inches. 


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