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PEAK VOLTAGE INDICATOR AND REGULATOR
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_ Original Filed Oct. 16, 19473
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PEAK VOLTAGE INDICATOR AND REGULATOR
Original Filed Oct. 16, 1945
5 Sheets~$heet 2
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.4102
HARRY crmmzm LEA’EL.
INS'ENTOR.
BY
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PEAK VOLTAGE ‘INDICATOR AND REGULATOR
Original Filed Oct. 16, 1943
3 Sheets-Sheet 3
Imam! CHARLES Lucas.
Patented July 16, 1946
2,403,988
UNITED STATES PATENT OFFICE
2,403,988
PEAK VOLTAGE INDICATOR AND
REGULATOR
Harry Charles Like], Brooklyn,v N. Y.
Original application October 16, 1943, Serial No. .
506,500. Divided and this application July 11,
1944, Serial No. 544,447
1
7 Claims. (Cl. 178—60)
The present invention relates to an indicator
for showing which of several peak voltages is the
cording to the method of copendingapplication
of Alder F. Connery, Serial No. 494,172, showing
highest, second highest, third highest, etc., and
the connections thereof to one terminal of a
also comprehends the application of the indicator
duplex telegraph circuit;
as a means for regulating the arti?cial line re
Figure 2 is a schematic diagram ofv one form
sistance of a duplex telegraph circuit both man.
ually and automatically.
of automatic regulator for adjusting the arti?cial
line resistance of a duplex telegraph circuit in
accordance with the peak voltages occurring in
the circuit; and
This application is a division of my copending
application Serial No. 506,500, ?led October 16,
1943.
In the following description the indicator is 10
shown as applied to a duplex telegraph circuit
although it may be utilized to indicate the rela
tionship between peak voltages in other circuits.
For example, the indicator may be utilized for
Figure 3 is a schematic diagram of an‘ alter
native circuit for balancing the two vacuum tubes
for the two circuits of the duo-triode of Figures
1 and 2.
indicating the peak voltage relationships between
Referring now to Figure 1, there is shown in
the upper part of that ?gure the telegraph equip
the phases of a polyphase system or for deter
ment for one terminal of a duplex telegraph cir
cuit. In these drawings I 0 and II represent the
mining the value and order in which peak volt
windings of the diirerential relay of a differential
ages occur between the cathodes and the anodes
of a multiphase recti?er.
type duplex or the bridge arms of 'a bridge type
As regards the indication of peak voltages in 20 duplex set. Asis customary, one‘ of these wind
ings or bridge arms, as the case may be, as I0,
the line and arti?cial line legs of a duplex tele
is connected to the real line and the other, I I, to
graph system, the application is to the method,
the arti?cial ‘line. Also as is usual, the opposite
disclosed in copending application of Alder F.
terminals of the two relay windings or bridge
Connery, Serial No. 494,172, ?led July 10, 1943,
arms are connected together and‘ to the trans~
for “Duplex balance indicator.” In general this
mitting key I2‘ (this may, of course, be the tongue
method depends upon the voltage relationships
of a transmitting relay). The key I2 is con
occurring between an arbitrarily selected point
nected by means of conductors I3 and I4 to limit
on a resistance in the real line leg of a duplex
ing resistance I5 and I6 and thence to the bat
circuit and two points on a resistance in the
arti?cial line leg, the latter two points being so 30 teries I1 and I8 which are oppositely poled as is
cutomary. Batteries I7 and I8 are connected to
selected that the maximum voltages occurring be
ground or ‘to a metallic return 20, this also being
tween each one of these points and the point in
in accordance with usual practice.- In this in
the real line will, when the system is in balance,
be equal.
stance, resistances 2I and ‘Here put in series
It is an object of my invention to provide a 35 with the windings or arms‘ I0" and II respectively
in order to lessen the effects of the mutual in
peak voltage indicator which will show the rela
ductance between'the windings I0 and II on the
tionship between voltages occurring in two or
peak voltage indicator, and to increase the resist
more related branches of a circuit.
ance of the legs of the circuit across which the
It is another object of my invention to provide
a peak voltage indicator which will show the 40 indicator is connected.
The Voltage divider 23 is center tapped at. 24
relationship between peak voltages occurring in
separate circuits.
and connected by means of a conductor 25' to the
split of the duplex at 26. The ends of the divider
It is a further object of my invention to pro
vide an automatic regulator operated by a peak 45 are connected by means of conductors 27 and 28
to the two legs of the duplex. Divider 23'is also
voltage detector, this regulator being adapted to
tapped at points 30 and 3|, point 3I being elec
alter the constants in one of two circuits to make
trically twice as far removed from the left end of
the peak voltages occurring in the two circuits
equal.
the divider, as shown in Figure 1, as is point 30
It is a still further object of my invention to 50 from the right end. As is explained in detail in
provide such a regulator as that mentioned above
the Connery application above mentioned, when
the arti?cial line is in proper balance, the peak
voltages occurring between points 30 and 3| and
arti?cial line resistance of a duplex telegraph
points 30 and 32 will be equal.
circuit.
The indicator of the present invention is shown
Further objects and features of my invention ~ 55
in the lower part of Figure l, and comprises the
will appear when the following description is con
two vacuum tubes 33 and 34 together with the
sidered in connection with the annexed drawings,
in which
glow tubes 35 and 36 and their associated cir—
particularly adapted to automatically regulate the
Figure 1 is a schematic diagram of a peak
cuits.
The control grid of Vacuum tube 33 is
voltage indicator applied for line balancing ac- 450 connected by means of potentiometer circuit 31
(comprising the potentiometer 38 and batteries 40
2,403,988
3
and 4!) and conductor 42 with the point 3| on
the voltage divider 33. The plate of tube 33 is
connected by means of conductor 43 to aload cir
cuit comprising condenser 44, resistance 45 and
glow tube 35.
4
The load condensers 44 and 51 serve two pur
poses. They prevent a too rapid build up of volt
age across the respective load resistances 45 and
56 and the lamp 3'5 and 36 in response to spuri
ous voltages of short duration in the grid cir
cuits of tubes 33 and 34 and, furthermore, they
This load circuit is in turn con
nected by means of conductors 46 and 41 to the ‘i ~ provide reservoirs of current to assure a bright
plate supply battery 43.
?ash of the associated glow lamps when they
The grid-cathode circuit of tube 33 is supplied '
with its operating potential by battery 56, poten
tiometer 5|, the voltage between points 36 and
3 I , and potentiometer circuits 31.
ionize.
Asshown in Figure 1, there are two additional
10
condensers 64 and 65 which are connected across
'
points 3i and 32' and 30 and 32 of the voltage
divider 23 respectively. These two condensers
are for the purpose of reducing the voltages de
veloped between points 3| and S5 and 33 and 32
during transient conditions such as those caused
by static unbalance or noise conditions.
As was indicated above the procedure in using
In a similar manner, the grid of vacuum tube
34 is connected by means of conductor 54 to point
32 of the potentiometer and the plate of this tube
is connected by means of conductor 55 to the load
circuit comprising glow lamp 36, resistance 56
and condenser 51. The load circuit is in turn
connected by means of conductors 58 and 41 to
the plate battery 48. The cathode of tube 34 is
connected by means of conductor 52 to the bat
tery 56 and potentiometer 5| being exactly sim
ilar in this respect to the corresponding circuit
of tube 33.
i
my device is as follows. First the measuring cir
cuits for the low and high sides must be bal
anced. To effect this the tubes 33 and 34 are
switched on and with no connections to the tele
. graph circuit the bias voltage E0 is made less
negative by adjustment of contact 6| on poten
'
The voltage in the grid~cathode circuit of vac
uum tube 34 in the bias voltage supplied by po
tentiometer 5| (in accordance with the adjust
ment of contact 6| thereon) plus the voltage oc
curring between points 30 and 32.
Hereinafter the voltage supplied by poten
tiometer 5i will be designated as E0 and that ‘sup
25 tiometer 51 until either lamp 35 or 36 ignites. If
lamp 35 ignites the voltage ,Eb is made more neg
ative whileif lamp 36 ignites this voltage is made
more positive. Contact 6| is then again adjust
ed until the voltage supplied by potentiometer 5i
30 is suf?ciently negative to cause the extinguish
plied by potentiometer 31 as Eb.
If now the potentiometer 5| is adjusted so that
the total voltages in the grid circuits of tubes 33
ment of the lighted lamp. This procedure is re~
peated until upon‘ reducing EC both lamps simul
taneously ignite.
When this occurs the circuits,
are balanced and ready for use.
and 34 are beyond the cut off point When the
The connections of the leads 25, 27 and ‘28 to
voltage divider 23 is not connected to the tele 35
the telegraph circuit, as shown in Figure 1, are
graph circuit, then upon connecting the divider
next made. The unit is now, ready for use in bal
ancing the telegraph circuit. Contact 6! is at
this time adjusted to make the biasing Voltage
with its positive polarity toward point 32 and the
transmitting relay tongue or the transmitting key 40. E0 a maximum and prevent either of the lamps
35 or 36 from lighting. Next E3 is slowly re
I2 is on the positive contact, the voltage appear
duced by adjustment of contact 6! until one or
ing between points 30 and 3! will be at its maxi
both of the lamps begin to ?ash. If the arti?cial
mum value with positive toward the grid of vac
line resistance is set at too low a value lamp 33
uum tube 33.
will ?ash, this lamp, of course, being suitably
If the incoming signal remains the same but
marked to indicate that its ignition represents
the transmitting key i2 is moved into contact
a condition of the circuit in which the arti?cial
with the negative battery the voltage appearing
line resistance is too low. Thereupon the arti?c
between points 30 and 32 of voltage divider 23
will be at its maximum value with positive to 50 cial line resistance is increased in value by some
suitable amount, say 50 ohms. If this causes the
ward the grid of tube 34. If now the voltage EC
lamp 36 to stop ?ashing and the lamp 35 to be
is slowly reduced in magnitude making the grids
gin to flash, it indicates that the proper value oi
of the two tubes 33 and 34 less negative, either
arti?cial line resistance is somewhere between
the grid of tube 33 or that of tube 34 or both
to the telegraph circuit if a voltage is developed
by the incoming signal across voltage divider 23
the old and new values. The resistance is so set
will be driven into the conducting region in turn
as the voltage conditions discussed above and 55 and checked by repeating the adjustment of the
in greater detail in the Connery application above
contact 6| to show that both lamps now flash.
In some instances, it is preferable to adjust
mentioned come about through the operation
of the telegraph circuit. As either tube conducts
the arti?cial line resistance automatically rather
the voltage across its load circuit comprising
than to merely indicate that such adjustment
glow lamp 35, resistance 45 and condenser 44 in 60 should be made. In Figure 2, there is shown an
one case and glow lamp 36, resistance 56 and
arrangement for accomplishing such automatic
adjustment. In this ?gure the voltage divider 23
condenser 51in the other, will rise until the par
ticular glow lamp ?ashes. Since the voltage Eb
is identical with that of Figure 1 and is connect
is so adjusted that with no voltage existing across
ed to the telegraph circuit in exactly the same I
the main and arti?cial lines both glow' lamps 65 manner. Furthermore, in this ?gure the two
would light at the same setting of the potentiom
pentode tubes 33 and 34 of Figure l have been
eter 5|, it will be clear that as E0 is slowly re-‘
replaced 'with a duo-triode 66, having two plates
duced, lamp 35 will ?ash before lamp 36 if the
61 and 68 and two grids ‘l0 and ‘II. It will, there
resistance of the arti?cial line is too high. Con
fore be clear that in effect this duo-triode 66 is
versely lamp 36 will ?ash ?rst if the resistance 70 the equivalent of the two tubes 33 and 34. The
of the arti?cialline is too low; Moreover if the
grids l0 and ‘H of the tube are connected to points
resistance of the arti?cial line is correct for bal
3| and 32 of the voltage divider 23 ‘by means of
ance, lamps 35 and 36 will ?ash in an irregular
alternate manner depending upon the combina
tions of the received and. transmitted signals.
leads 42 and 54 in a manner exactly similar to
.75 .the connection of the gridsfof the pentodes of
2,403,988
.
‘ 5
Figure 1 to the voltage divider 23. In place of
the output or load circuits comprising the lamps
35 and 35, resistances 45 and 55 and condensers
by a change in the voltage level on the line, the
voltage Ec which was previously (in the circuit
of Figure 1) manually adjusted, must now be
44 and 5?, there are supplied two breakover re
authomatically
adjusted if the circuit is to op
lays ‘I2 and ‘I3, the windings of which are re Cl
erate
without
supervision.
For this purpose, two
spectively connected to the plates 68 and 61 of
relays I05 and I06 are provided, these relays be
the duo-triode 65. Upon operation of either of
ing respectively operated by the operation of
these relays and considering relay 12 as an ex
break
over relays ‘I2 and ‘I3. Relays I05 and I06
ample, it will be seen that a short circuit is re~
moved from the associated magnet ‘I4 of an arti 10 are adapted to place bias upon the grids 10 and
‘II of the duotriode 65. Considering now relay
?cial line resistance adjusting device generally
I05 it will be seen that this relay is operated at
designated ‘I5.
the time when the short circuit is removed from
The resistance adjusting device 15 comprises
magnet ‘M as above described, the winding of
a rheostat ‘I6 having a rotatable contact 11
relay I05 being in parallel with the winding of
mounted upon a shaft ‘I8 upon which are also
magnet ‘M. Likewise relay IE6 is operated when
mounted for rotation therewith the two ratchet
break over relay 13 operates, its winding being in
wheels 80 and 8|. Cooperating with the ratchet
parallel with the winding of magnet 86 and the
wheel 80 is a resilient pawl 82 made integral with
short circuit being removed from its winding at
the armature 83 of the magnet 14. In like man
the time of operation of relay 23. Upon opera
ner, a resilient pawl 81; integral with armature
tion
of relay I05 a circuit is completed from bias
05 of magnet 86 cooperates with the ratchet wheel
ing battery I I0 through conductors III and H2,
3 I. The rheostat ‘IE is substituted for the normal
closed contact and tongue of relay I05, conductor
adjustable arti?cial line resistance and is con
II3, resistance I07 and condenser I08 in parallel,
nected through a movable contact 11 to ground
and resistance H4 to the other pole of battery
or to the return line by means of conductor 81.,
H0. Essentially the same circuit is completed
the rheostat 75 being connected at its other ter
upon the operation of relay I05. The closure of
minus to the arti?cial line end of the duplex
the circuit just above traced raises the bias volt
differential relay or duplex bridge arm such as I I
age E0 which decreases as the charge on condenser
of Figure 1.
It will be clear that when magnet 14 is op 30 I08 is dissipated. Thus, as the line level changes,
the bias voltage Ec is caused to be raised and
erated, the arti?cial line resistance is increased
lowered through a range in the same manner as
and when magnet 86 is operated the resistance
is decreased. As was indicated above, magnet 14
is operated upon the operation of break over
manual adjustment was made in connection with
the circuit of Figure 1. Under suitable line con
ditions, ?rst one break over relay will operate
relay 12. However, the circuit for operating this
and then the other, causing the arti?cial line
magnet was not traced in detail above but will
resistance to hunt by the amount represented
by one tooth of the ratchet wheels 80 and 8|.
be in the following. Normally both magnets ‘I4
and 80 are short circuited by virtue of the nor
In some instances it is preferable to equalize
the output of the two tubes 33 and 34 or to equal
ize the output of the two plate circuits 6‘! and 68
mally closed position of the contacts of relays 12
and 73. When relay ‘I2 is in its normal position
a circuit is completed from the battery 90 over
conductor 9|, resistance 02, conductor 93 to the
contact and tongue of relay 12 to conductor 94
and thence over conductors 95, 96, 91 and 98 to
the opposite side of the battery. In a like man
ner, when relay ‘I3 is in its normal position a cir
cuit is completed from battery 90, conductor I00,
resistance IOI, conductor I02, contact and tongue
of relay is to conductor 94 and thence over the
path just above traced in connection with relay >
72 to the opposite Side of battery 00. Upon op
eration of relay 12 the circuit above traced for
it is broken at its tongue and contact and the
short circuit removed from magnet 14, the. op
erating circuit for this magnet then extending
from resistance 92 through conductor I03 to the
magnet and thence over conductor 98 to the op
posite side of the battery 90. In the identical
manner the operation of relay ‘I3 removes the
short circuitfrom the magnet 86 and permits
its energization over a circuit extending from re
of the duo-triode 66 by adjusting their plate
potentials rather than by the adjustment of the
grid voltage. In this case the potentiometer 37
of Figures 1 and 2 is omitted and a potentiometer
43
I20, Figure 3, is provided in the plate circuits of
the two tubes. It will be seen that by adjusting
the contact I2I on the potentiometer I20 and the
voltage applied to the plates 6'! and 60 of the
duo-triode 66, the output of these tubes may be
made equal so that the indicators in the load
circuit, whether these indicators be the glow
lamps 35 and 35 as shown in Figure 3 or the
break over relays ‘I2 and 13 of Figure 2, will ignite
under the same peak voltage conditions in the
circuits under test. When such a potentiometer
I20 is used it is preferable to utilize resistances
I22 and I23 across the battery 40 in order that
current may be ?owing at all times in the poten
tiometer and in order that the potentiometer
resistance may be less than would otherwise be
necessary. These two bleeding resistances I22
sistance IOI through conductor I04 and the mag
and I23 should be of equal value.
net winding to conductor 98 and the opposite
As was indicated above, and as will be obvious
side of battery 90. It will be obvious from the
description of Figure 1 that when the arti?cial 65 to those skilled in the art, the potentiometer I20
may be utilized as an equalizing circuit in con
line resistance is too high it causes energization
nection with the automatic regulator of Figure 2,
of breakover relay 13 which in turn causes op
as well as in connection with the indicator of
eration of magnet 85 and clockwise rotation of
Figure 1. As will also be obvious, either the duo
shaft 70, thereby lowering the arti?cial line re
sistance. Conversely when the arti?cial line re-. 70 triode of Figures 2 and 3, or the two tube arrange
ment of Figure 1 is susceptible to this mode of
sistance is too low breakover relay ‘I2 is energized
adjusting the output to cause operation of the
to in turn energize magnet 14 and increase the
glow lamps or break over relays under the same
arti?cial line resistance.
voltage conditions of the two circuits under test.
Due to the fact that a change in the line bal
ance is usually if not invariably accompanied 075 It will be understood, however, that if the two
tube arrangement is used the tubes must be triode
2,403,988
tubes since with pentode tubes the plate voltage
change will not be effective.
While I have described preferable embodiments
of my invention it will be understood that many
additional modi?cations are possible. Moreover,
it will be clear that instead of indicating the
peak voltages in circuits having a common leg,
it is entirely possible by mechanically intercon
necting potentiometers such as 5| of Figures 1
and 3, to indicate the relative value of peak volt
ages occurring in entirely separate circuits.
8
second mentioned taps, the input circuit of the
second electron tube including that portion of
the voltage divider between the ?rst mentioned
tap and the arti?cial line end of the voltage di
vider, relay means in the output circuit of each
of said electron tubes, said relay means being
operable only upon the application thereto of a
certain minimum voltage, means to adjust the
output of one of said tubes to cause both said
10 relay means to function upon the application of
a particular voltage to the corresponding electron
Again the comparison need not be between two
circuits only, but may be extended by the addi
tion of vacuum tubes and indicators to as many
circuits as may be desirable. It will, of course,
be understood that in this instance all tub-es ex
cept one would be supplied with a potentiometer
circuit such as 31 of Figure l, or the equivalent
thereof shown in Figure 3, in order that the vac
uum tubes might be adjusted to operate under
the identical peak load conditions. Consequent~
ly the scope of my invention is to be determined
not by the foregoing description, but solely by
the annexed claims.
What is claimed is:
1. In a device for regulating the arti?cial line
resistance of a duplex telegraph circuit, in com
bination, a voltage divider having a center tap
and adapted to have said center tap connected
to the split of the duplex and its ends connected
one to the real line and one to the arti?cial line
tube input circuit, means to connect said voltage
divider to said duplex circuit, and means oper
ated by each of said output relay means to vary
the arti?cial line resistance in opposite directions
to thereby maintain the arti?cial line in balance
with the real line.
3. In a device for regulating the arti?cial line
resistance of a duplex telegraph circuit, in com
bination, a voltage divider having a center tap
and adapted to have said center tap connected
to the split of the duplex and its ends connected
one to the real line and one to the arti?cial line
of the duplex, said voltage divider having two
additional taps the ?rst one of which is located
a predetermined electrical distance .from the main
line connection of the divider and the second one
of which is located twice that electrical distance
from the arti?cial line end of the voltage divider,
a pair of electron tubes each having an input cir
cuit and an output circuit, the input circuit of
one of said tubes including that portion of the
voltage divider between said ?rst and said second
mentioned taps, the input circuit of the second
of the duplex, said voltage divider having two
additional taps the ?rst one of which is located
a predetermined electrical distance from the main
electron tube including that portion of the voltage
line connection of the divider and the second one 35 divider between the ?rst mentioned tap and the
of which is located twice that electrical distance
arti?cial line end of the voltage divider, break
from the arti?cial line end of the voltage divider,
over relays in the output circuit of each of said
a pair of electron tubes each having an input
electron tubes, said breakover relays being oper
circuit and an output circuit, the input circuit
able only upon the application thereto of a cer
of one of said tubes including that portion of
tain minimum voltage, means to adjust the output
the voltage divider between said ?rst and said
of one of said tubes to cause both said breakover
second mentioned additional taps, the input cir
relays to function upon the application of a par
cuit of the second electron tube including that
ticular voltage to the corresponding electron tube
portion of the voltage divider between the ?rst
input circuit, means to connect said voltage
mentioned additional tap and the arti?cial line
divider to said duplex circuit, and means oper
end of the voltage divider, means in the output
ated by said output breakover relays to vary the
circuit of each of said electron tubes, said means
arti?cial line resistance in opposite directions to
being operable only upon the application thereto
thereby maintain the arti?cial line in balance
of a certain minimum voltage, means to adjust
the output of one of said tubes to cause both 50 with the real line,
4. In a device for regulating the arti?cial line
resistance of a duplex telegraph circuit, in combi
nation, a voltage divider having a center tap and
adapted to have said center tap connected to the
split of the duplex and its ends connected one to
the real line and one to the arti?cial line of the
vidually one to vary the arti?cial line resistance
duplex, said voltage divider having two addi
in one direction and the other in the opposite
tional
taps the ?rst one of which is located a
direction to thereby maintain the arti?cial line
predetermined electrical distance from the main
in balance with the real line.
2. In a device for regulating the arti?cial line 60 line connection of the divider and the second one
of which is located twice that electrical‘ distance
resistance of a duplex telegraph circuit, in com
from the arti?cial line end of the voltage divider.
bination, a voltage divider having a center tap
a pair of electron tubes each having an input
and adapted to have said center tap connected
said output means to function upon the appli
cation of a particular voltage to the correspond
ing electron tube input circuit, means to con
nect said ‘voltage divider to said duplex circuit,
and means operated by said output means indi
circuit and an output circuit, the input circuit of
one to the real line and one to the arti?cial line 65 one of said tubes including that portion of the
voltage divider between said ?rst and said second
of the duplex, said voltage divider having two
mentioned taps, the input circuit of the second
additional taps the ?rst one of which is located
electron tube including that portion of the voltage
a predetermined electrical distance from the main
divider between the ?rst mentioned tap and the
line connection of the divider and the second one
of which is located twice that electrical distance 70 arti?cial line end of the voltage divider, means
in the output circuit of each of said electron
from the arti?cial line end of the voltage divider,
tubes, said means being operable only upon the
a pair of electron tubes each having an input
application thereto of a certain minimum voltage,
circuit and an output circuit, the input circuit
'means to adjust the output of one of said tubes
of one of said tubes including that portion of
the voltage divider between said ?rst and said 75 to cause both said output means to function upon
to the split of the duplex and its ends connected
9
2,403,988
the application of a particular voltage to the
corresponding electron tube input circuit, means
to connect said voltage divider to said duplex cir
cuit, an adjustable arti?cial line resistance,
means under the control of one of said output
means for adjusting said resistance to lessen the
magnitude thereof, means operable by the other
of said output means for adjusting said resistance
to increase the magnitude thereof, and means
10
voltage divider between said ?rst and said second
mentioned taps, the input circuit of the second
electron tube including that portion of the volt
age divider between the ?rst mentioned tap and
the arti?cial line end of the voltage divider, means
in the output circuit of each of said electron tubes,
said means being operable only upon the applica
tion thereto of a certain minimum voltage,
means comprising a potentiometer in the input
operable upon the operation of either of said out 10
circuit of one of said tubes to adjust the output
put means for decreasing and thereafter grad
of said tube to cause both said means to func
ually increasing the output of both of said tubes
tion upon the application of a particular volt
to compensate for the changed line and arti?cial
age to the corresponding electron tube input cir
line voltages resulting from the adjustment of
cuit, means to connect said voltage divider to said
said arti?cial line resistance.
15 duplex circuit, an adujstable arti?cial line resist
5. In a device for regulating the arti?cial line
ance, means under the control of one of said out
resistance of a duplex telegraph circuit, in com
put
means for adjusting said resistance to lessen
bination, a voltage divider having a center tap
the magnitude thereof, means operable by the
and adapted to have said center tap connected to
other of said output means for adjusting said re
the split of the duplex and its ends connected one 20 sistance to increase the magnitude thereof, means
to the real line and one to the arti?cial line of
comprising a pair of relays operated respectively
the duplex, said voltage divider having two addi
by said output means and a source of potential
tional taps the ?rst one of which is located a
and condenser inserted in the input circuits of
predetermined electrical distance from the main
said electron tubes for decreasing and thereafter
line connection of the divider and the second one 25 gradually increasing the output of both of said
of which is located twice that electrical distance
tubes to compensate for the changed line and ar
from the arti?cial line end of the voltage divider,
ti?cial line voltages resulting from the adjust
a pair of electron tubes each having an input
ment of said arti?cial line resistance.
circuit and an output circuit, the input circuit of
7. In a device for regulating the arti?cial line
one of said tubes including that portion of the 30 resistance of a duplex telegraph circuit, in com
voltage divider between said ?rst and said second
bination, a voltage divider having a center tap
mentioned taps, the input circuit of the second
and adapted to have said center tap connected to
electron tube including that portion of the voltage
the split of the duplex and its ends connected one
divider between the ?rst mentioned tap and the
to the real line and one to the arti?cial line of
arti?cial line end of the voltage divider, means 35 the duplex, said voltage divider having two addi
in the output circuit of each of said electron
tional taps the ?rst one of which is located a pre
tubes, said means being operable only upon the
determined electrical distance from the main line
application thereto of a certain minimum volt
connection of the divider and the second one of
age, means to adjust the output of one of said
tubes to cause both said means to function upon
the application of a particular voltage to the cor
which is located twice that electrical distance
from the arti?cial line end of the voltage divider,
a pair of electron tubes each having an input cir
cuit and an output circuit, the input circuit of
one of said tubes including that portion of the
voltage divider between said ?rst and said second
under the control of one of said output means for
mentioned taps, the input circuit of the second
adjusting said resistance to lessen the magnitude
electron tube including that portion of the Volt
thereof, means operable by the other of said out
age divider between the ?rst mentioned tap and
put means for adjusting said resistance to in
the arti?cial line end of the voltage divider,
crease the magnitude thereof, means comprising
means in the output circuit of each of said elec
a pair of relays operated respectively by said out 50 tron tubes, said means being operable only upon
put means and a source of potential and con
the application thereto of a certain minimum
denser inserted in the input circuits of said elec
voltage, means comprising a potentiometer in the
tron tubes for decreasing and thereafter grad
output circuit of one of said tubes to adjust the
ually increasing the output of both of said tubes
output of said tube to cause both said means to
to compensate for the changed line and arti?cial
function upon the application of a particular
line voltages resulting from the adjustment of
voltage to the corresponding electron tube input
said arti?cial line resistance.
circuit, means to connect said voltage divider to
6. In a device for regulating the arti?cial line
said duplex circuit, an adjustable arti?cial line
resistance of a duplex telegraph circuit, in com
resistance, means under the control of one of said
bination, a voltage divider having a center tap 60 output means for adjusting said resistance to
and adapted to have said center tap connected to
lessen the magnitude thereof, means operable by
the split of the duplex and its ends connected one
the other of said output means for adjusting said
to the real line and one to the arti?cial line of
resistance to increase the magnitude thereof,
the duplex, said voltage divider having two addi~
means
comprising a pair of relays operated re
tional taps the ?rst one of which is located a pre 65 spectively by said output means and a source of
determined electrical distance from the main line
potential and condenser inserted in the input cir
connection of the divider and the second one of
cuits of said electron tubes for decreasing and
which is located twice that electrical distance
thereafter gradually increasing the output or both
from the arti?cial line end of the voltage divider,
of said tubes to compensate for the changed line
a pair of electron tubes each having an input cir 70 and arti?cial line voltage resulting from the ad
cuit and an output circuit, the input circuit of
justment of said arti?cial line resistance.
one of said tubes including that portion of the
HARRY CHARLES LIKEL.
responding electron tube input circuit, means to
connect said voltage divider to said duplex cir
cuit, an adjustable arti?cial line resistance, means
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