An Improved Electrical Pendulum Indicator.
Year: 1893

page_text: Date of Application, 13th Feb., 1893
Complete Specification Left, 13th Nov., 1893—Accepted, 16th Dec., 1893
PROVISIONAL SPECIFICATION.
An Improved Electrical Pendulum Indicator.
EBENEZER BEAL 167 Highfield Road Seedley Manchester Electrical Instrument
Maker do hereby declare the nature of this invention to be as follows :-
I use for the armature a permanent steel magnet A. of a semi-circular shape,
this I suspend on its centre in the holder B. at the end of an electro-magnet, which
I make by using a bobbin of wire D, with an iron screw C. for the core I make
this same screw fix the movement to a board, or case, & also fix the holder B to the
end of bobbin. To the magnet A I fix by suitable means the card holder E.
This is a shaped piece of any non-magnetizable metal and acts:-
(1) By means of the V-shaped notches at the top to keep the centre of the
armature A on the knife edge of B.
(2) To hold at the bottom a card of any design.
(3) It provides by means of the card, the necessary weight & length to keep the
armature A swinging for a certain length of time when started.
The holder B. can be made of any hard metal, of the shape shewn. It is bent,
or rather twisted, so that the two holes are at right angles to each other, the hole
in which the armature swings is chamfered on each side so as to form a knife edge
at its centre. There is a cut through the top of this to enable it to be sprung
open to receive the armature when it is closed up again. The other hole is to
receive the screw which fixes it to the face of the bobbin D.
Now on passing an electric current of suitable strength through the wire of
bobbin D the iron screw becomes magnetised, and will attract the magnet
armature A. On the cessation of the current the armature will fall away, and
from the momentum gained will swing till stopped by gravity.
Dated this 9th day of February 1893.
COMPLETE SPECIFICATION.
An Improved Electrical Pendulum Indicator.
EBENEZER BEAL 167 Highfield Road Seedley Manchester Electrician do
hereby declare the nature of this invention 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 a cheap electrical indicator, as I shall describe, referring
to the drawings sent with my Provisional Specification.
The armature A. is a steel permanent magnet, of a semi-circular shape, which is
suspended on its centre, and is free to swing on the holder B. B. is a thin steel
punching of the shape shewn, and so bent that the two circular ends (each having
a hole through) are at right angles to each other. The edge of the hole, on which
the magnet rests, is chamfered on both sides, so as to bring it to a knife edge, so
as to enable the magnet armature to swing freely. It is also split at the top to
enable the armature to be inserted. The other hole is for an iron screw C. to pass
through, which fixes it against the face of a bobbin of wire D.
This same screw passes right through the centre of the bobbin (forming the
magnet core,) and thence into the board, or case, to which it is intended the
movement to be fixed.
The card holder E is made of very thin brass, and is of the shape substantially
as shewn. It is fixed to the armature A by two projections which are bent round
the magnet thus clipping it tight. Another projection having a V shaped cut in

page_text: the end of it, is bent over the centre of the magnet, and when in place matches the
V shewn in the front view. These V shaped cuts are for the purpose of keeping
the centre of the magnet A on the knife edge of B. The lower end clips a thin
card F which may be of any design.
The whole being now put together it will be seen that the magnet armature A
rides over the bobbin D close to the end, the length and weight of E and F having
converted it into a pendulum.
Now on a current of electricity of suitable strength being sent through the wire
of the bobbin the screw becomes magnetized, and attracts the end of the magnet
armature which is of opposite polarity to the end of the screw, and repels the other
thus giving the pendulum a sideway motion. On the current ceasing to flow, the
screw looses its magnetism, and the armature falls away, and from the momentum
gained the pendulum swings until stopped by gravity.
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:
-
1. An electrical pendulum indicator, substantially as described, having for its
armature a permanent magnet.
2. An indicator as described in which one screw forms the magnet core, fixes the
armature holder, and also fixes the movement to a case.
Dated this 13th day of November 1893.
TAND DET
BT גזשז