Protecting Alarm-Circuit. Page: 2 of 4
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UNITED STATES PATENT OFFICE.
IRVIN E. BARRICLOW, OF DALLAS, TEXAS.
PROTECTING ALARM-CIRCUIT.
SPECIFICATION forming part of Letters Patent No. 591,725, dated October 12, 1897.
Application filedJune 22, 1896. Serial No. 596,506. (No model.)To all whom it may concern:
Be it known that I, IRVIN E. BARRICLOW, a
citizen of the United States, and a resident
of Dallas, in the county of Dallas and State
5 of Texas, have invented certain new and
useful Improvements in Protecting Electric
Alarm-Circuits, of which the following is a
specification.
The object of my invention is to protect a
io place or an object by means of an electric
circuit so applied and combined with an
alarm and other apparatus that the protected
place or object cannot be broken into or the
protecting-circuit broken or short-circuited
I5 without giving an alarm at the alarm-station.
In putting my invention into effect I em-
ploy an alarm device or other suitable indi-
cator held normally inoperative by two bal-
anced powers, either of which actuates the
20 alarm or indicator in the event of the other
losing power or in the event of gaining power
itself. One of these balanced powers is an
electromagnet, while the other may be a spring
or anyequivalent device, and an arm or other
25 moving part arranged to actuate the alarm
by movement in either of two directions is
brought under control of these two balanced
powers and by them normally held in an in-
termediate position. The electromagnet con-
30 stituting one of these powers is included in
the line-circuit to be protected, and means
is employed for maintaining a constant cur-
rent on this line-circuit. In order to prevent
tampering with the line-circuit, this current-
35 controlling resistance is duplicated, one re-
sistance being located at the local station
and the other at the distant point to be pro-
tected, and pole-changers are employed adja-
cent to the respective resistances in order to
40 introduce them alternately in the line-cir-
cuit, so that while the effect on the electro-
magnet is the same as if one resistance re-
mained in all the time it is obvious that
should the line be tampered with the distant
45 resistance, which is of known length and
equal to the local resistance, will fail to do
its duty and the equilibrium which holds the
alarm inactive will be destroyed.
In addition to the foregoing features my
5o invention consists in novel details in the ar-
rangement of the parts and current-revers-
ing apparatus, as will hereinafter be fullydescribed, and particularly pointed out in
the claims.
In the accompanying drawings, Figure 1 is 55
a diagrammatic view illustrating the com-
plete system. Figs. 2, 3, and 4 are detail
views showing,, respectively, the two pole-
changers and the commutator on the local
pole-changer, which reverses the current on 6o
theline and actuates the distant pole-changer.
1 represents the alarm, which may be in
the form of an ordinary electric bell and un-
der control of a circuit composed of the wires
2 3 4 and including a battery 5, two contact- 65
points 6 7, and an arm 8, pivoted at 9 and vi-
brating between the contacts 6 and 7. Upon
the pivot 9 of the arm 8 is mounted a spring
10, which tends to swing said arm against
the contact 7, and also an armature 11, which 70
is under the influence of the poles 12 of elec-
tromagnet 13 and tends to swing the arm 8
against contact 6.
14 is an arm by means of which the ten-
sion of the spring 10 may be regulated at will. 75
15, 16, and 17 represent the local wires of
the line-circuit, which includes the electro-
magnet 13 and a local standard battery 18.
These wires also connect with a pole-changer
20 at the local station and through it with 8o
the main-line wires 21 and 22, which lead to
the distant point to be protected.
23 23" represent a network of conductors
forming a part of the main line and forming
a cover and a lining to the inclosure for parts 85
of the system which are located at the dis-
tant point, and this network of conductors is
such that the inclosure cannot be tampered
with without breaking the circuit, which fact
will be immediately indicated at the local sta- 90
tion.
24 is a pole-changer within the protected
inclosure.
In order to maintain a constant current over
the line 15, 16, 17, 21, and 22 and through 95
magnet 13, a local resistance 25 is employed,
which, together with the standard battery 18,
will serve this purpose. In order that it may
be known at all times whether the distant
protected point remains undisturbed and in zoo
circuit, a precisely similar resistance 25a is
located at said distant point, and these re-
sistances 25 and 253 are connected by shunt-
wires 26 27 and 26a 27a, and the pole-changers
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Barriclow, Irvin E. Protecting Alarm-Circuit., patent, October 12, 1897; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth174764/m1/2/?rotate=90: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.