IMPROVEMENTS IN ELECTRICAL SELF-ADJUSTING PENDULUM INDICATORS
Year: 1884

page_text: We FREDERICK KING and WILLIAM PHILLIPS MENDHAM both of the Western
Electrical Works Narrow Wine Street in the City and County of Bristol
Manufacturing Electricians do hereby declare the nature of our invention for
IMPROVEMENTS IN ELECTRICAL SELF-ADJUSTING PENDULUM INDICATORS to be as
follows:-
•
The object of our Invention is to obtain a greater sensitiveness and freedom of
action of the swinging pendulum in an electrical self adjusting pendulum Indicator,
than has hitherto been achieved, at the same time so to arrange the working parts
that they may be capable of a much finer adjustment than is ordinarily accorded
them.
The first part of our invention we accomplish by suspending the pendulum in
such a way that it swings freely from the tips of two or more needle points placed
in a vertical position by which means we greatly increase its sensibility to action, &
condition very essential where the pendulum is required to swing for a considerable
time after having received its first impulse.
The second part of our invention has reference to improved means of adjustment
of armature or magnet in a pendulum Indicator.
It is usual in some Indicators to clamp down the electro magnet with its
bobbins in such a way that only the thin edges of the bobbins rest on the on the
base board, a practice very often resulting in the magnet getting out of adjust-
ment in consequence of the wood warping or shrinking from the damp The iron
cores of our magnet we secure to an extension of the metal base preferably in such
a way that they point in a downward direction; the armature placed at the end of
the magnet is caused to work freely on pivots, also secured to the metal base, and
to rest by its own weight away from the magnet, thus obviating the use of a spring
for this purpose.
The pendulum we hang from a support from the metal base so that it may
swing preferably in front of the magnet and be struck below the point of
suspension by an arm proceeding from the armature as it is moving by attraction
to the magnet.

page_text: It will thus be seen that all the working parts are fixed to a metal base,
whereby disarrangement of parts by damp or any other cause is entirely avoided,
the adjustment being effected by movement of the arm of the armature which arm
consisting preferably of a piece of wire admits of very fine adjustment. .
The bobbins of wire having been fitted on to the iron cores of the magnet and
the necessary connexion with the battery having been made, upon the passage of a
current of electricity, the armature is attracted to the poles of the magnet and in
moving strikes against the shaft of the pendulum, which at once begins swinging
and continues so to do for the space of two or three minutes by virtue of the needle
points from the tips of which it is suspended.

page_text: We FREDERICK KING and WILLIAM PHILLIPS MENDHAM both of the Western
Electrical Works Narrow Wine Street in the City & County of Bristol
manufacturing Electricians do hereby declare the nature of our invention for
IMPROVEMENTS IN ELECTRICAL SELF ADJUSTING PENDULUM INDICATORS and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
The object of our Invention is to obtain a greater sensitiveness and freedom of
action of the swinging pendulum in an electrical self adjusting pendulum Indicator
than has hitherto been achieved, at the same time so to arrange the working parts
that they may be capable of a much finer adjustment than is ordinarily accorded
them.
The first part of our invention we accomplish by suspending the pendulum in
such a way that it swings freely from the tips of two or inore needle points placed
in a vertical position with their points upwards by which means we greatly increase
the sensibility of the pendulum to action, a condition very essential where the
pendulum is required to swing for a considerable time after having received its first
impulse.
The second part of our invention has reference to improved means of adjustment
of armaturo or magnet in a pendulum Indicator.
It is usual in some Indicators to clamp down the electro magnet with its bobbins
in such a way that only the thin edges of the bobbins rest on the base board, &
practice very often resulting in the magnet getting out of adjustment in consequence
of the wood warping or shrinking from the damp.
The iron cores of our magnets we secure to an extension of the metal base in
such a way that they point in a downward direction. The armature placed at the
end of the magnet is caused to work freely on pivots, which pivots are also secured
to the metal base, and to rest by its own weight away from the magnet poles, thus
obviating the use of springs for this purpose. The pendulum we hang from a
support from the metal base so that it may swing in front of the magnet and be
struck below the point of suspension by an arm proceeding from the armature as it
is moving by attraction to the magnet.
It will thus be seen that all the working parts are fixed to a metal base,
whereby disarrangement of parts by damp or any other cause is entirely avoided,
the adjustment being effected by movement of the arm of the armature, which arm
consisting of a piece of wire admits of very fine adjustment.
The bobbins of wire having been fitted on to the iron cores of the magnets and
the necessary connection with the battery having been made, upon the passage of
an electric current, the armature is attracted to the poles of the magnet and in
moving strikes against the shaft of the pendulum, which at once bgins swinging
and continues so to do for the space of 2 or 3 minutes by virtue of the needle points
from the tips of which it is suspended.
A is the metal frame upon which the bobbins B are mounted. C is the support
fixed into the upper part of the metal frame and carrying the needle points (shown
inside the tube), D is the tube or socket resting on the tips of the needle points
and carrying the pendulum F. G is the arm proceeding from the armature
pivoted below the magnet poles.

page_text: Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed, we declare that what
we claim is :-
1. The construction of a pendulum Indicator in which needlepoints are used,
from or on the tips of which the pendulum is caused to swing substantially as
herein before described.
2. The construction of a pendulum Indicator in which the armature is so placed
below the magnet poles that it rests by its own weight away from the magnet
poles substantially as hereinbefore described.
3. The combination in a pendulum Indicator of Needle points as a means of
suspension for the pendulum and an armature so placed relatively to the magnet
poles, that upon a current of electricity circulating round the magnet poles, it is
attracted up to the magnet poles, the arm proceeding from the armature striking
the shaft of the pendulum causing it to swing, substantially as hereinbefore
described.
"
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