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Патент USA US2133140

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Oct. 11, 1938.
Filed Jan. 8, 1936
5 Sheets-Sheet 1
“Haas Erich Hellman
Oct. 11, 1938.
Filed Jan. 8, 1956
5 Sheets-Sheet 2
FIG. 2
, 13.9
2,91: g [71'
AWL/1W???) f
,?’ans Erik}; Hollm mm
Z’ ’
Oct. 11, 1938.
Filed Jan. 8, 1936
5 Sheets-Sheet 3
FIG. 5
HOIZJ Eric/Q Hell/mum
Patented Oct. V11, 1938
ancoanma navroa
Hans Erich Hollmami, Berlin-Wllmeradori',
In Germany
Jam, December
a, 1936, Serial
29, 1934
' '
11 Claima; (01. res-2.06)
The present invention relates to electro-cardl
ographs and more particularly to an improved
system for and method of producing cardio
graphic records.
As is well known, electro-cardiographs 'de
pend for their action on the minute potential
variations produced in the human or animal
organism by the exciting action of the heart.
.By recording these action potentials or currents
10 tapped from different portions of the body such
as between the limbs as continuous curves. by
means of an electric oscillograph such asan
electro-magnetic mirror oscillograph or a cathode
ray oscillograph physicians are enabled to draw
15 valuable conclusions on the propagation of the
exciting action and other conditions of the heart
of a patient.
In measuring and/or recording the voltage in
the heart, it is found that the voltage varies ac
20 cording to the direction of the- axis of the heart
which latter further changes during a heart beat
cycle, so that it has become customary to se
cure various simultaneous combinations of read
ings of voltages between different points of the
body, such as from, the left arm through the
fact that a cathode ray oscillograph is a poten
tial responsive rather than va current respon- ,
sive device, whereby. reactions from one tapping
circuit or derivation through thebody upon an
other tapping circuit due to current flow are sub- 10
stantially eliminated.
The method of using a separate ampli?er for
increasing the action voltages drawn from the
patient, apart from the fact of increasing the
parts and apparatus required and consequently 15
the initial cost, has the further disadvantage
that the ampli?ers have to be adjusted to equal
gain and matched both as ‘,to'amplitude and fre
quency response in order to enable a comparison
of both amplitude and phase relation of the in-= 20
dividual cardiographic curves obtained.
It is an object of the present invention to over
come the above di?iculty and to enable the use
of a limited number of ampli?ers for simultane
ously and independently recording a plurality of 25'
heart to the right arm, hereinafter referred to as
action voltages drawn from different points of
action voltage or “derivation” I; from the left
the human body.
arm to one of the legs such as the left leg, here
With this general object in view the invention
in one of its embodiments involves the provision
inafter referred to as action voltage orv“deriva
30 tion” II; and from the right arm to the left leg,
hereinafter referred to as action voltage or “de
rivation” III, or between any other points of the
body such as between diiferent points of the
patient's breast with theheart' in.the center.
35 By simultaneously recording two or more action
voltages upon the same viewing screen and/or
record‘ strip and in relation to the same time
axis, both the magnitudes and phase differences
between the instantaneous potentials of the ac
40 tion voltages during the individual heart beat
cycles may be studied and valuable information
obtained about the function and anatomical con
dition of the heart.
‘For the simultaneous recording of two or more
45 action voltages or derivations a corresponding
of a system wherein the input of a single ampli- 30
?er is connected periodically and in rapid suc
cession to a plurality of input circuits or con
nectors applied to the points of the body of a
patient from which ‘the action voltages are to
be drawn by meansv of a periodic switching‘ de- 35
vice, while at the same time the output of the
ampli?enis connected to the respective record
ing devices synchronously with the connection
of the input circuit. In order to preserve the
shape of the curves recorded the switching fre- 40
quency is made considerably higher thanvthe
maximum‘frequency of the heart beat curves or
cycles, and furthermore the recording devices are
su?iciently damped to eliminate the eifect of
transient potentials produced bythe switching 4:;
number of recording devices are required. ' More
operation. Since the frequency of the heart beat
over, the action potential variations obtained are
extremely weak, thus making it necessary to use
switching means such as oscillating or rotating
a'separate ampli?er to increase the potentials
50 sufficiently so as to effect a de?ection of the re
cording beam such as the light beam in a mir
ror type oscillograph or the electron beam in a
cathode ray oscillograph.
While the improvements of the present inven
lographic systems they may be employed with
equal advantage for any other type of oscillo
graph‘, such ‘as a mirror oscillograph. Special
advantages are obtained when using a cathode
ray oscillograph as a recording devicedu'e to the 5
tion are primarily useful for cathode ray oscil
curves or cycles is rather low, simple mechanical
contact devices may be employed for effecting
the synchronous connection of the input and 50
output circuits of the ampli?er.
According to another embodiment of the in
vention especially adapted for simultaneous re
cording of two action voltages, a single oscillo
graph is provided with means for alternately 55
shifting its time axis from one position to an
other in synchronism with the switching of the
tacts connected to the points I and 2 and to the
action voltages to the input of the ampli?er.
cording devices 4 and 5, respectively. In the ex
ample shown for recording the two action voltages
II and III, the tapping point 3 and the inner se
rially connected ends of the energizing windings
of the recording devices 4 and 5 are grounded.
The switching devices ‘I- and 8 may be operated in
Accordingly, it is a further object of the in
vention to provide an electro-cardiographic sys
tem for simultaneous and independent recording
of at least two action voltages drawn from differ
ent points of the human body by means of a single
recording device and ampli?er.
A further object of the invention is the provi
magnets energized by interrupted direct current
sion of a system for recording three or more ac
tion potentials drawn from the human body with
a limited number of ampli?ers with or without
impulses or the like produced in the example
shown by an electro-magnetic vibrator or buz~
zer 9.
synchronous switching.
recording screen.
any suitable manner such as by means of electro
In an arrangement of this type, it is seen that
Another object is the provision of a simpli?ed
composite cathode ray oscillograph for simulta
neously and independently recording a plurality
of input potentials hooked up according to a
three-pole system upon a single viewing and/or
The above and further objects and features of
the invention will become more apparent from the
following detailed description taken with refer
ence to the accompanying drawings forming part
25 of this speci?cation and wherein
Figure 1 illustrates a simple diagram for a mul
tiple electro-cardiograph system employing a sin
gle amplifier and synchronous switching devices
associated with the input and output circuit of the
open ends of the energizing windings of the re
the voltage II between the tapping point I and
ground isapplied to the input of the ampli?er in
the position III of the switch ‘I while in the posi
tion II of the switch the action voltage III be
tween the point 2 and ground is impressed upon
the ampli?er. Simultaneously the corresponding 20
oscillograph devices 4 and 5 are connected to the
output of the ampli?er in synchronism with the
switch 8 and as a result both oscillograph de
vices receive short current impulses the intensity
of which is proportional to the instantaneous po 25
tentials prevailing at the tapping points I and 2.
The mirrors I2 and I3 are therefore deflected in
proportion to the instantaneous variations of the
action voltages H and III and may serve to pro
duce oscillographic records on a recording strip 30
Figure2 shows a similar system to Figure 1 em
ploying a composite cathode ray oscillograph
such as a photographic ?lm or paper in a known
constructed according to the invention,
transient switching potentials, the oscillograph
Figure 3 shows a further modi?cation of the in
35 vention for simultaneous and independent record
ing of several action voltages by means of a sin
gle ampli?er and oscillograph device,
Figure 4 illustrates a system for simultaneous
recording of three action potentials drawn from
a human body employing two ampli?ers,
Figure 5 illustrates the composite de?ecting ar
rangement for a multiple cathode ray oscillo
graph embodied in Figure 4, and
Figure 6 shows a system similar to Figure 4 for
multiple recording of three action potentials.
Like reference characters identify like parts in
the di?'erent views of the drawings.
Referring to Figure 1 of the drawings, there
are shown at I, 2 and 3 three tapping points from
which action potentials are drawn from the hu
man body by means of suitable connectors
strapped to a patient. Thus. point I may corre
spond to the left arm; point 2 to the right arm;
and point 3 to the left leg whereby the voltages
obtained between these points are represented by
the connecting lines therebetween as shown at
I, II and III forming a three-pole voltage triangle.
There are further shown at 4 and 5 a pair of os
cillogra-phic recording devices for simultaneously
recording the action voltages II and III. The re
cording devices illustrated are of the electro-mag
netic mirror type comprising electro-magnets and
mirrors I2 and I 3, respectively, suspended on
strings passed through the magnetic ?eld in a
known manner and upon which light beams from
a source 69 are projected to be variably de
?ected by the oscillations of the mirrors in ac
cordance with the currents applied to the magnet
windings. The currents required for energizing
70 the magnets are supplied from a valve ampli?er
i. In order to record the action voltages II and
III simultaneously, the input and output circuits
of the ampli?er are each connected to the mov
able members of a pair of synchronously operated
75 switching devices 1 and 8 having cooperating con
manner. In order to prevent interference by the
devices should be su?iciently damped. Further
details, such as the circuit connections, provision 35
of supply voltages, etc., for the ampli?er 6 and
the rest of the apparatus have been omitted from
the drawings for the sake of simplicity of illustra
tion and disclosure and as not forming a part of
the present invention. }
The principle of the invention as illustrated
by Figure 1 may be extended to the recording of
all three action potentials. For this purpose, it
is advantageous to consider the three tapping
points I, 2 and 3 as the potential points of a 45
three phase system subject to the general law
of such systems according to which the geomet
rical vector sum of the three voltages at every
instant is equal to zero; or in other words, the
sum of the voltages between I and 3 and 2 and 50
3 must at any time be equal to the voltage be
tween I and 2. Thus by forming the differential
voltage between the action voltages II and III
the action voltage I may be obtained.
In place of electro-magnetic recording devices 55
as illustrated, it is understood that any other
oscillograph device may be used such as a cath
ode ray or glow discharge oscillograph without
departing from the spirit of the invention.
If a cathode ray oscillograph is used, the ar
rangement may be greatly simpli?ed by using
a composite multi-beam oscillograph device con
structed according to the invention in place of
three separate oscillograph tubes. In a device
of this character only four electrostatic de?ect
ing plates are required for effecting the de?ec
tion of the three electron beams as illustrated in
greater detail in Figure 2. In the latter there
is shown a system for simultaneously recording
three action voltages between points I, 2 and 3
related to each other according to a delta system
by means of a single ampli?er and a single com
posite multi-beam cathode ray oscillograph. The
input circuit for the ampli?er is substantially
similar to that shown in Figure 1. The contacts
faiaaili'o' 1-"
or heinput' circuit 0'! the ampli?er.‘ In the
'>|5T'ot“:the;.s_witching device‘?jiassoelated
with. the‘ outputicircuit or the. ampiiiierare -_con-.
‘ example illustrated the action voltage I is con
‘ ,. wnected'to (the inner" plates; l6” and [I of acomé ; nected to‘ the ‘in-put of the ' ampli?er 26 in the
.g;i‘positegelectlnostatici‘lde?ectingfsystemvcomprising , position 23 of’a'vibrating switch 24 while the
" four plates arranged inparallel' to each other,be—' , ' action voltage II is connected to the ampli?er
dtween' 'each-gltwo ' or which: , an" electron been?!” is " input in ,the'opposite position-25 or the. switch.
.passedEThe electron beams
belproduced 1 There. is further shown a means-such as a battery:
" by irieiain's‘ofv anyone of;theknown‘generatingv 21 for impressing an additional di'?erentiating
.systemszsluch-as by separate 'cathodes'having asi ‘ ' potential inseries with the action voltage II to
; jsociated' therewith suitableconcentrating or elec-> effect 'a displacement of the zero or time axis
,tr‘onéopti'cal liens arrangements jtogobtain ‘a thin ‘ -, on. themoving recording strip 29 of the record'
ing‘ device 28connected to the output circuit of
‘ 1" concentrated.electroniabeam tr, pencil; The de
‘ 1‘,‘?ecting ?eldfor the'centraliel'ectron beam is pro-_. ’ the ampli?er ‘26; Thus,-in the position 25 of the
a‘! ducedbetw'een' the-plates.“ and If! while the; de ' switch 24, the small additional voltage supplied
Iiilecting:?eldsffor the , outer‘ electron beams are * by the battery 21 is also ampli?ed in such'a man- ‘
- :produced between. the ' plates -' i6 and’ I9 and, the I “ner?-that‘ the recording beam of the indicating '
] plates ‘i1. and-20‘, respectively; -_~ Depending on
1 the position of the switches, land 8, plates ,li‘and
device‘ is displaced by a de?nite distance shown
at 30. In this manner the two action potentials
are 'diiferentiat'ed from each other by displace
‘- I ‘I ‘are charged to a ‘potential , proportional‘ to" the .
20. ,instantaneouspotentials ‘at-the tapping points
I_ I mentoi the zero or ‘time axis by an amount equal
and},v respectively. [Inorder to prevent a dis— ' to the de?ection 30 on the recording strip 28. If
' sipation of these charges vduring‘the Switching
now the action ‘voltages are superimposed ai- '
. ‘I‘Jeriods by leakage and'to imposesu?icient damp
ternately and in rapid succession by the action of
the vibrating switch 24 and at a frequency ‘which
“is high relative to, the frequency of the heart 24')
beat cycles or curves to be recorded,_ cardio
graphic curves representing the variations of the
ing upon the de?ecting systems‘; the plates liiand
25, i‘! > have connected; therewith suitable ‘damping
‘elements such as resistances 2| and condensers
,22 placed ‘between- the plates and ground. It is
‘seen that in this manner an instantaneous .volt- . .action potentials l and 2 are recordedabove-the
age vcorresponding to the action voltage II is im
respective‘ zero ‘or-time axes on the recording
30 pressed upon the plates iGjand ‘l9, andna further ’
This simplemethod offers theadvantage over‘
voltage corresponding to the action voltage III ,
:is impressed upon, the plates 'l'I and 20, while a » previous arrangements that only a single oscil
voltage ‘proportional to‘ the di?erence between
the action voltages II, and III corresponding/to
l‘ographic device isréquired which‘ does vnot re
quire any smoothing or damping elements due to '
the fact that the oscillograph is operating con
l6 and ~_l Tin such a manner that the three action ‘ tinuouslyv during both switching! periods in
voltages are simultaneouslyrecorded by the three such a manner that ‘the recording is independ
electron beams. The arrangement of the re ' ent of transient potentials between the switch-v
35 the action voltage I is set up between the plates
ing periods, since'only the instantaneous values‘
maining parts of the cathode ray tube I8 such
40 as the luminescent screen-impinged by the elec
. are recorded without integrationastin the case
tron beamsYto produce luminous recording spots
{and further means for producing a permanent
of the previously described arrangement. III" the
switching is instantaneous as is true of most
record on a photographic strip are obvious to mechanical switches, the luminous recording spot
those skilled in the art and have been-omitted,‘ will change so quickly to and from the two axes
that the change will hardly be noticeable or only
45 ‘from the drawings and disclosure for simpli?ca
, .
, a slight shadow 'be produced between the two
‘ In an analogousfmanner the action voltage I
may be obtained by the difference between the '
cardiographic records.
While it is possible by an arrangement of this -
vcurrents supplied‘ by vthehampli?er. if a current type to record‘ only two action; voltages, the
‘system has great advantages due to its simplicity
50 responsive recordingv device is used. In the lat
ter case, however, reactions and disturbances and» etliciency where not more than two simul
may occur under certain circumstances with re-'
gard to the ‘distribution or‘ the current for wh‘ ch
reason an, electrostatically responsive recording
(n in device such as-a cathode ray oscillograph is to be ,
preferred in practice.
In place of electro-magnetically operated syn
‘chronous switching devices any equivalent known
arrangement may be used such ‘as rotating con
60 tact devices mounted upon the same shaft,.or
electronic switching‘ may be employed by means
‘ of vacuum or gaseous discharge tubes operating
- tarieous records are required.
' In certain casesvthe switching may cause an-v
noyance to sensible patients although weak ca
pacitative charging currents may be impressed
upon the patient'withou't harm if the apparatus
is suitably designed and constructed.
Inview of the distortions which may occur in
an electro-cardiogram due to the slightest irri
tation of the patient, it may be desirable incer 60
tain cases to eliminate entirely any ‘potential
variations in the patient circuit‘ and to effect a
substantiallyvwithout inertia and controlled by ‘displacement of thezero axis of the recording
suitable alternating control potentials.“ It is
further understood that the invention may be
employed for'recording' more than three action
voltages by means of a common ampli?er by
‘ correspondinglyincreasing the number of switch
device in another portion of the system. For this
purpose a second contact may be provided upon
the movable member of the switch 24 by means
of which either the bias of an intermediate stage,
the‘ plate voltage or the magnitude of the output
load resistance of the ampli?er 26 may be varied
synchronously with the switching operation. 70
Referring‘ to Figure 3, there is shown an ar
frangeme‘nt for simultaneously recording tw-o ac- ' Furthermore, the synchronous displacement of
tion voltages '(I‘and H) though a single ampli?er the vzero axis may be e?'ected independently of
and by means of'a ‘single recording device by the recording device such as by directing the light.
alternately displacing the zero axis of the record
beam of the oscillograph to an 1 auxiliary oscil
ing contacts, as is readily understood.
75 ing _ device ' synchronously withv the connection
lating mirror mounted upon the tongue or mov
able member of the switch 24 in such a manner
as to project the light beam to one zero axis in
one position of the switch and to the other zero
axis in the other switch position. Finally, if a
cathode ray oscillograph is employed the zero
point may be displaced magnetically by means of
anodes of the ampli?ers 45 and 46 provided with
load impedances 41 and 48 connected in series
with the anodes and a common anode potential
source 49. If both ampli?ers are of equal design
a small magnetic ?eld coil with an energizing
circuit connected and disconnected by an addi
central electron beam is de?ected in accordance
with the variations of this voltage. The effect of
tional contact associated with the switch 24 to
10 de?ect the cathode ray periodically to and from
the two time axes.
the direct current voltage drops produced by the
Referring to Figure 4 there is shown a system
for recording three action voltages such as sup
plied from a triangular tapping system previ
15 ously described whereby only two ampli?ers with
out switching are required. The action voltages
I and II are applied to a triple-cathode ray
oscillograph 32 through the intermediate ampli
?ers 30 and 3|. The electron beams for the tube
20 32 are produced by means of cathods 33, 34 and
35 surrounded by ‘concentration cylinders 50, 5|
and 52, respectively, or any other electron-optical
concentrating systems. The cathodes are further
arranged opposite the openings 36, 3'! and 38
of a common diaphragmatic anode or focussing
electrode 53. In place of three separate de?ect
ing systems for the electron beams, a composite
de?ecting arrangement comprising four electro
static de?ecting plates 39, 40, 4| and 42 ar
30 ranged in parallel is provided similar to that
shown in Figure 2. The electron beam produced
by the cathode 33 is passed between the de?ect
ing plates 39 and 40; the electronbeam pro
duced by the cathode 34 is passed between the
de?ecting plates 49 and 4|; and the electron
beam produced by the cathode 35, is passed be
tween the de?ecting plates 4| and 42.
The operation of an arrangement of this type
will be better understood by disregarding the
ampli?ers 30 and 3|. In the latter case the
voltage triangle I, 2 and 3 is connected to the
four de?ecting plates 39 to 42 in such a man
' ner that point 3 is connected to the two outer
plates 39 and 42 which accordingly are at the
same potential while the points | and 2 are con
nected to the two central plates 40 and 4|, re
spectively. As is seen, the voltage I is impressed
upon the plates 39 and 40 and the voltage II
is impressed upon the plates 4| and 42 while the
voltage III appears between the plates 40 and 4|.
As a result, the three electron beams are de?ected
by the three voltages and three simultaneous
cardiographic records produced upon the lumi
nescent screen applied to the opposite end of
the tube. In order to obtain a time axis for
the curves obtained, either a moving recording
strip or rotating mirror may be provided or the
electron beams may be simultaneously de?ected
linearly in a direction at right angles to the de
60 ?ection effected by the plates," and 42. For
the latter purpose according tgl‘a further feature
of the invention a common/pair of time sweep
de?ecting plates 43 and 44 (see Figure 5) ex
tending over all four de?ecting members 39 to
and balanced to have equal gain only the voltage 21
III will appear between the anodes whereby the
impedances 41 and 48 are eliminated or balanced
by connecting the outer plates 39' and 42 to
suitable tap points of the anode potential source
to prevent initial displacement of the outer elec
tron beams from their zero positions. Otherwise,
the arrangement and operation according to
Figure 6 is substantially similar to that described
in connection with Figure 4.
The arrangements and methods disclosed by
the invention are not limited to the recording
action potentials drawn from a human body but 20
as is understood equally apply to the ampli?ca
tion and/0r recording of any potential variations
related in accordance with a three-pole system.
It will be evident from the above that the
invention is‘ not limited to the speci?c arrange 25
ments and methods shown and disclosed herein
for illustration, but that the underlying inven
tive concept and novel principle is susceptible of
numerous variations and modi?cations coming
within the broader scope and spirit of the in a0 "
vention as de?ned in the appended claims.
I claim:—
1. In an electro-cardiograph for simultaneous
ly recording a plurality of action voltages drawn
from different contact points of_ a patient, a'
recording system, a common ampli?er, switch
ing means for successively and periodically con
necting the input of said ampli?er to the dif- -
ferent contact points at a frequency substantially
higher than the highest frequency of the action
voltages to be recorded, means operating in syn
chronism with said ?rst means for separately‘
recording the individual action voltages as
curves upon diilerent zero axes of the recording
system, and damping means for said recording 45
system to eliminate the effect of transient switch
ing potentials upon the curves recorded.
2. In a device for simultaneously recording
three action voltages of a human organism
linked up with each other in the form of a 50
three-pole system, a common ampli?er, means
for periodically connecting the input of said
ampli?er in rapid alternation to two of said
voltages at a rate which is high relative to the
variations of said action voltages, and means for 55
recording the third of said voltages as a dif~
ferential voltage of the two ampli?ed voltages.
3. In an electro-cardiograph, means for simul
taneously recording a plurality of action poten
tials drawn from different contact points of a 60
patient, comprising a plurality of recording units
each coordinated to one contact point for indi
vidually recording the action potentials tapped
therefrom, a common'ampli?er, switching means
sweep potential preferably of saw tooth shape' for periodically connecting the input of said
ampli?er in rapid succession to the separate
produced in a known manner to effect a simul
taneous time sweep for the three separate elec
contact points, further switching means for suc
tron beams.
cessively and periodically connecting the output
Figure 6 illustrates a similar diagram com
of said ampli?er to the respective recording units
posite cathode ray oscillograph of the type shown in synchronism with said ?rst switching means,
in Figure 4. In this ?gure the ampli?ers are the frequency of said switching means being high
illustrated by three-electrode valves 45 and 46. compared with the frequency of the action volt
The de?ecting plates "and 4| of the cathode ages to be recorded, and damping means for said
75 ray oscillograph are directly connected to the recording units to eliminate the eiiect of tran- 75
42 are provided connected to a suitable source of
2,188,140 "
sient switching potentials upon the curves of the electrostatic de?ecting system comprising four
_ de?ecting plates arranged substantially parallel
action voltages being recorded.
4. In apparatus for simultaneously recording a to each other, each of said electron beams pass
ing between two or said de?ecting plates, and
, three alternating voltages linked up with each
other in the form of ‘a three-pole system, a
cathode ray tube comprising means for produc
ing three separate cathode rays and four de
?eeting members arranged side by side, each of
said cathode rays passing between two of said
10 de?ecting members, the two 7 outer de?ecting
members being connected to one pole of said
system and each of the two inner de?ecting
connections from both outer de?ecting plates to
one pole and from each of the inner plates to
one of the remaining poles of said delta circuit.
8. In a device for the simultaneous indication
of three alternating voltages linked up with each '
members being connected to one of the remain
other in the form of a three pole system, one of 10
said poles being earthed, the combination of two
ampli?ers the input circuit of each of which is
connected to one of the two free poles of said
ing two poles of said voltage triangle, whereby
three-pole system and a common cathode ray
15 each of said rays is controlled by one of said
oscillographic device comprising means for pro
ducing three cathode rays, four de?ecting plates
5.,Inv apparatus for simultaneously recording
in‘ linear arrangement, each one of said three
three alternating voltages ,linked up with each ' rays being ?anked by two of said de?ecting plates,
other in the form of a three-hole system, a the two outer ones of said de?ecting plates being
20 cathode ray device comprising means for pro
.ducing three ‘separate cathode rays, a ?rst de
?ecting arrangement comprising four electro
static de?ecting plates arranged side by side,
earthed and the two inner ones of said de?ecting 20
plates each being connected to one of said two
ampli?ers, respectively.
9. In a device for the simultaneous recording
each of said cathode rays passing between two of three alternating voltages linked up with each
other in form of a three pole system, one pole of 25
25 plates of said de?ecting arrangement, a second
de?ecting arrangement comprising a pair of de
which is earthed, of a common ampli?er, a com—
?ecting plates perpendicular to and coextensive mon cathode ray oscillographic tube, means for
with said ?rst de?ecting arrangement, and producing three separate cathode rays therein,
means for impressing the potential at one pole four de?ecting plates in said tube in linear ar
30 of said system upon both of the outer plates of rangement, the two outer ones of said de?ecting 30
said ?rst de?ecting arrangement and for im , plates being earthed, means for alternately con
pressing each of, the potentials at the remaining necting the two inner ones of said de?ecting
poles of said system upon one of the inner plates plates to the input circuit of said common ampli
of said ?rst deflecting arrangement, whereby all ?er in rapid periodicity and means for synchro
35 three cathode rays are individually de?ected by nously connecting said ampli?er to each of said 35
said ?rst de?ecting arrangement in one plane by two free poles of the said three pole system.
10. In a device for the recording of more than
the voltages of said system and may be simul
taneously de?ected by a voltage impressed upon
one action voltage of a human organism, a com--v
said second de?ecting arrangement in a per
mon ampli?er, recording devices respectively
adapted for recording each of the action voltages, 40
pendicular plane.
6. Means for simultaneously recording three
alternating voltages linked up with each other
means for periodically connecting the output of
said ampli?er in rapid succession to each of the
according to a delta circuit comprising a com
said respective recording devices, and electric
posite cathode ray oscillograph, means for pro
damping means adapted to suppress the record~
ing of the switching impulses to permit the simul
taneous recording of said alternating voltages.
45 ducing three separate electron beams therein
and an electrostatic de?ecting system compris
ing four de?ecting plates arranged substantially
parallel to each other, each of said cathode rays
passing between two of said de?ecting plates,
50 and connections from both outer de?ecting
plates to one pole and from each of the inner
11. In a device for simultaneously recording
three action voltages of a human organism linked
upwith each other in the form of a three-phase
system, a cathode ray tube comprising means in 50
cluding a common anode for producing three
plates to one of the remaining poles of said deltas separate cathode rays, four de?ecting members
for said three rays arranged parallel to each
'7. Means for simultaneously recording three other and at equal distance from said anode, the
55 alternating voltages linked up with each other in two outer de?ecting members being connected 55
a delta circuit comprising a composite cathode to one pole of said three-phase system, and
ray oscillograph, means for producing three means including a common ampli?er for periodi
cally connecting each of the remaining poles of
initially concentrated substantially parallel elec
tron beams therein, a common diaphragmatic said system to one of the inner de?ecting mem
60 focussing electrode having three apertures each bers through said ampli?er in rapid succession.
passing one of said electron beams, and an
Patent No. 2,155,1uo.
October 11, 1958.
It is hereby certified that‘the above numbered patent was erroneously
issued to the patentee, said "Hollmann" , whereas said patent should have
been issued to Radio Patents Corporation, ‘a corporation of New York, as
assignee, as shown by the record of ‘assignments in this office; and that
the said Letters Patent should be read with this correction therein that
the same may conform to the record of the case in the Patent Office.
Signed and sealed this 15th day of November, A. D. 1938 .
{enry Van Arsdale
Acting Commissioner of Patents.
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