IMPROVEMENTS IN ELECTRICAL INDICATORS to be as follows:
Year: 1884

page_text: 86
I, WILLIAM HENRY BAUGHAN of 14 Kirby Street, in the City of London,
Manufacturing Electrician, do hereby declare the nature of the said invention for
'IMPROVEMENTS IN ELECTRICAL INDICATORS to be as follows:-
"
My invention relates to apparatus for indicating the sounding of an electric bell
or other signal, and it is designed to effect this in a simple and efficacious manner,
by the action of a single electro-magnet, controlling a freely pivoted gravity
indicating disc, two electro magnets being usually required in such appliances.
My indicator consists of an electro-magnet, supported in a suitable wall bracket,
and is provided with an armature pivoted at one end, which controls the movement
of an oscillating gravity arm, or pendulum, carrying an indicating disc.
The armature may be either attached direct to the oscillating indicator arm, or
they may both be pivoted on distinct centres, the armature in either case controlling
the movement of the gravity indicator arm or pendulum.
The normal position of the indicator arm, under the influence of gravity, is such
that the armature is away from the electro-magnet, but immediately the signal
circuit, exciting the electro-magnet, is closed, the armature, and thus the indicator
arm controlled by it, is attracted to the electro-magnet, and thus an indication of
the signal is given by the movement of the indicating disc.
In that case in which the armature is attached to the pivoted arm of the indicator,
the latter will, on cessation of the signal current, be released, and falling back by
gravity to its normal position will oscillate for some time before coming to rest, the
indicating disc being made of considerable weight, and the arm being swung on
vertical pins working in cups in a frame to aid this.
In the other case, where the armature is pivoted upon a distinct centre from
that of the indicator arm, the weighted gravity indicator disc or pendulum is
inverted, and caused, by the action of the armature, to oscillate over the vertical
dead centre, and thus to remain over that centre, until set back into its normal
position by the action of the attendant, in any suitable way.

page_text: I, WILLIAM HENRY BAUGHAN, of 14 Kirby Street, in the Oity of London,
Manufacturing electrician, do hereby declare the nature of the said invention for
"IMPROVEMENTS IN ELECTRICAL INDICATORS" and in what manner the same is to
be performed to be particularly described and ascertained in and by the following
statement :-
My invention relates to apparatus for indicating the sound of an electric bell or
other signal, and it is designed to effect this in a simple and efficacious manner by
the action of a single electro magnet, controlling a freely pivoted gravity indicating
disc, at least two electro magnets being usually required in such appliances.
In order that my invention may be the better understood I now proceed to
describe the same, reference being had to the drawings hereto annexed, and to the
letters and figure marked thereon. Like letters refer to similar parts in the
different figures.
Figure 1 is a front elevation of one form of my improved indicator.
Figure 2 is another side view of the same device..
Figure 3 is a front view of an alternative form of my improved device.
Figure 4 is a plan of the latter from underneath.
My indicator consists of a single electro magnet A, supported in a suitable wall
bracket B, and is provided with an armature C, pivoted at one end C¹, which
controls the movement of an oscillating gravity arm or pendulum D D¹ carrying an
indicating disc E E¹.
In figures 1 and 2, the armature C is attached direct to the oscillating indicator
arm D, and thus the pin pivots F on which the arm D oscillates, serve also for the
pivoted joint of the armature.
In figures 3 and 4 the armature C is pivoted at C¹ by suitable centres, whilst the
indicating arm D¹ is pivoted at d, the end of the armature Centering between the
fork G G of the oscillating indicator arm D¹, so as to control its movements.
The normal position of the indicator arms E E¹ are as shown, under the influence
of gravity, and are so that the armature C is away from the electro magnet
poles a, a. The indicating discs E E¹, being then at rest, are showing no indication
of a signal having been transmitted. Immediately the signal circuit, in which the
electro maguet A is included, is closed, the poles a a become thereby magnetic,
and the armature OC is attracted to the said poles, and draws the indicating arm
with it, and thus the indication of the signal is given by the movement of the
indicating discs E E¹.
In the case of the indicator, shown at figures 1 and 2, where the armature O is
attached to the pivoted arm D of the indicator, the latter, on cessation of the signal
current, will be released, and falling back by gravity to its normal position, will
oscillate for some time before coming to rest. To facilitate this oscillation, the arm
is pivoted on two vertical pins ff, resting in cups in the framing, and an adjustable
weight H to which is attached the indicating disc E, conveniently a corrugated
silvered mirror, or painted glass, or metal, fitted to the end of the indicator rod or
pendulum D.
In the alternative form of my device, as shown in figures 3 and 4, the gravity
indicator disc or pendulum E¹ is inverted, and by the attraction of the armature C
to the poles a a, the said gravity indicator is caused to pass over the vertical dead
centre, into the position shown in dotted lines, and thus to remain over that centre
until set back into its normal position by the action of the attendant in any
suitable way.
E

page_text: 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 is
1st The combination, in an electrical signal indicator, of a single electro magnet
with pole pieces and pivoted armature, controlling and moving from a normal
position a freely pivoted gravity indicator disc, substantially as described.
2nd In such an electrical signal indicator, the mounting of the pendulum on a
pair of needle points, with adjustable weight and indicating disc upon the said
arms, substantially as described.
3rd In such an electrical signal indicator, the construction of an inverted and
pivoted gravity indicator arm and disc, with fork terminating at lower end, in
which the armature engages to control the action of the said disc, substantially as
described.
T
100K
FELL & WILDING,
Agents for the Applicant.