IMPROVEMENTS IN APPARATUS FOR MEASURING AND REGISTERING ELECTRIC CURRENTS
Year: 1885

page_text: Electric Currents.
I ALFRED GEORGE BROOKES of the firm of Wm Brookes & Son of 55 & 56
Chancery Lane in the County of Middlesex Fellow of the Institute of Patent
Agents, do hereby declare the nature of my invention for "IMPROVEMENTS IN
APPARATUS FOR MEASURING AND REGISTERING ELECTRIC CURRENTS," to be as
follows:-
The invention relates to improvements in apparatus for measuring electric
currents and more especially to that class of apparatus as described in my pro-
visional specification filed with my application for Patent dated July 23rd 1885;
N° 8923 and the objects of my improvements are to make such apparatus
independent of its position and of any outside motions or shocks, which it may
be submitted to when placed in ships, cars or other movable objects. Instead
of moving, by means of the intermitting motion of the armature lever, a charged
lever for driving the wheel work in the manner described in the Provisional
Specification of my said application, the movement of the armature is employed
directly for winding up the driving spring of the wheel work. To this effect the
armature of the electro-magnet is connected with a lever having its fulcrum on
the axis of the friction or ratchet wheel. This lever is provided in the well known
manner with a ratchet or pawl, which engages into the said ratchet or friction
wheel and causes the same to be rotated intermittingly by alternate raising and
lowering.
As soon as the armature in consequence of the electric current passing the
electro-magnet is drawn towards the core of the latter, the friction or ratchet
wheel is rotated and thereby winds up the spring of the spring-barrel connected
with the wheel. But as simultaneously by the descending armature the branch
current wherein the electromagnet is inserted, is interrupted, the armature is lifted
by the motion of the wheel work from the core of the electro magnet until a pin,
fixed to the armature lever and driving the rheotome, closes again the branch
circuit, thus the armature is attracted again and the wheelwork gets a new

page_text: impulse. By the descending of the armature a segment in the notch of which
the said pin of the armature lever engages is placed in such a manner as to
interrupt the circuit.
Instead of using a branch circuit for driving the wheelwork any other separate
source of electricity may be employed therefor or the driving spring of the wheel
work may be wound up by hand as an ordinary clock or the clockwork may be
driven by weights.
To make also the measuring apparatus independent of its position and of the
movements to which it is submitted, the core of the solenoid, through which the
current to be measured passes, is formed as a ring or disk entirely balanced and
moveable around its axis. One part of such ring or disk is made of a material
which can not be magnetized, while the resting part consists of iron or is covered
with iron. This core can be drawn into a solenoid which surrounds the part to be
magnetized and is correspondingly shaped; it thereby will rotate and indicate
all declinations from its normal position on the disk of the registering apparatus
by means of an indicator fixed either directly upon the axis of the annular core
or connected therewith by suitable transmitting devices.
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page_text: "
Improvements in Apparatus for Measuring and Registering
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Electric Currents.
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I ALFRED GEORGE BROOKES of the firm of Wm Brookes & Son' of 55 & 56
Chancery Lane in the County of Middlesex Fellow of the Institute of Patent
Agents do hereby declare the nature of my invention for IMPROVEMENTS IN
APPARATUS FOR MEASURING AND REGISTERING ELECTRIC CURRENTS and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:-
M
LIST
The invention relates to improvements in apparatus for measuring electric
currents and more especially to that class of apparatus as described in the
Specification filed with my application for Patent dated July 23rd 1885 N° 8923.
This invention consists in the detailed construction and combination of the
parts hereinafter fully described and claimed, by which the apparatus is made
to work independent of the position in which it may be placed and of any motions
or shocks to which it may be subjected when placed in ships, railway cars, or
other vehicles.
J
In the accompanying drawings
7
Figure 1 is a rear elevation of the apparatus.
Figure 2 is a plan view looking downwards from above.
Figure 3 is front side elevation of the recording mechanism.
Figure 4 is a side view in detail of the driving and registering devices.
1.
411
.11.
11.
i
An electro magnet a is provided and placed in the main circuit or in some
branch of the same, by means of the connecting wires a¹ a
Instead of moving the wheel work of the registering gear by means of a pivotted
armature and a separate pivotted lever, as described in the above mentioned
application for letters patent, I connect the armature g. of the electro magnet
directly to a lever d which is pivotted at one end upon the spindle of the friction
or ratchet wheel l. The lever d is provided with a pawl m of ordinary con-
struction suitable for engaging with the said friction or ratchet wheel, and causing
it to rotate when the lever d is moved back and forth.
t
When the electric current flows through the wire from a¹ to a³, the armature g
is drawn downwards and the wheel rotated, this winds upon a spiral spring
contained within the spring case and thereby sets in motion the disc L to which
it is connected by the train of clock work mechanism 1º.
The lever d is further provided with the arm d¹ on the free end of it and
carrying the pin 8. A segment plate u is pivotted in suitable brackets and placed
in the path of the current; this plate is provided with a slot in which the pin 8
works. When the pin 8 descends it rotates the plate u breaks the connection
between the said plate and the wire a² and the armature g, being no longer
attracted by the current is raised by the tension of the spring inside the casing ".
The upward movement of the armature and the lever d rotates the plate u, and
again allows the current to pass freely from a to a³. The armature is again
attracted and the rotation of the disc L. kept up.

page_text: C is a solenoid provided with wires c c¹ for the passage of the electric current ;
D is the core of the solenoid the ends of which are connected by the portion D¹,
which is made of material which cannot be magnetized. The two parts D and D¹
when connected together form a circular ring which is connected to a central hub
by means of spokes so that the said ring is entirely balanced in all its positions.
E is the axis upon which the said ring is pivotted. B is an indicator which is
connected to the balanced ring so that it partakes of its movements as actuated
by the said solenoid and the electric current which passes through it; the end
of the indicator carries a point which bears upon the disc L and records thereon
the force of the current.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed I declare that what
I claim as new and desire to secure by letters patent is
1. In an apparatus for measuring and registering electric currents, the com-
bination of an electro magnet, a lever pivotted at one end and provided with the
armature g, and pins 8, the segment plate u, a wheel connected to the said lever
by means of a ratchet and pawl, the clockwork mechanism actuated by a spring
wound up by the movement of the said wheel, a revolving disc operated by the
said clockwork, and an indicator bearing upon the said disc, substantially as and
for the purpose set forth.
2. In an apparatus for measuring and registering electric currents, the com-
bination of an electro magnet, a lever pivoted at one end and provided with the
armature and pin 8, the segment plate u, a wheel connected to the said lever
by means of a ratchet and pawl, the clockwork mechanism actuated by a spring
wound up by the movement of the said wheel, a revolving disc operated by the
said clockwork, an indicator bearing upon the said disc, and a solenoid for actuating
the said indicator, substantially as and for the purpose set forth.
3. In an apparatus for measuring and registering electric currents, the com-
bination of a balanced ring consisting of the two parts D and D', provided with
arins and pivoted on a central axis, a solenoid for operating the said ring, and
indicator connected to the said ring, and a revolving disc, substantially as and for
the purpose set forth.
.
4. In an apparatus for measuring and registering electric currents, the com-
bination of a balanced ring consisting of the two parts D and D¹, the solenoid C,
the indicator B, the disc L, intermediate clockwork mechanism provided with a
spring, a ratchet and pawl, the lever d for winding up the said spring and provided
with the armature g and pin 8, the segment plate u, and the electro magnet a
substantially as and for the purpose set forth.