IMPROVEMENTS IN ELECTRICAL INDICATORS to be as follows:
Year: 1885

page_text: We, HENRY GEORGE ELLERY, of 8 West Leigh Road, and JOHN THOMAS. GENT,
of Harborough Road, both of Leicester, in the county of Leicester, Electricians do
hereby declare the nature of the said invention for "IMPROVEMENTS IN ELECTRICAL
INDICATORS to be as follows:---
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This invention relates to improvements in the construction of electrical pendulum
indicators the object being to simplify and lessen the cost of the construction of
the parts at the same time rendering the apparatus more effective than hitherto..
The invention consists mainly in securing the electro magnet by means of
projecting poles driven into or screwed to a. bracket carrying a moving or
swinging pendulum as hereinafter described.-The magnet may be of any suitable
construction and have one or both poles surrounded by an insulated wire through
which a current of electricity can be made to pass and magnetise the iron poles
thereby converting them while the electricity is passing into an electro magnet.
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The pendulum consists of a soft iron armature, suspended and working upon
steel knife edge bearings; from the armature passes a metal rod to which the
indicating tablet is attached; we provide a bracket of such, a shape that it will
carry the two bearings of the pendulum armature and the magnet in one piece. The
poles of the magnet project beyond the reels containing the wire, and two holes
are drilled in the bracket to fit the said projecting poles. We then drive the poles
firmly into the metal bracket or secure the same by screwing or otherwise, the
projecting poles being cut to the exact length to correctly act upon the swinging
armature which is suspended in the same bracket no other fastening. being
necessary. The bracket is provided with lugs for fastening it to the case in which
it is to be used. In this manner the bracket for carrying the armature and
magnet is made in one piece.
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The operation is as follows: a current of, electricity is sent through the magnet
so as to attract and pull the armature of the pendulum up to the poles; when the
current is broken the armature is allowed by its own weight to swing away from
the poles of the magnet and by means of the impetus it will continue to move
backwards and forwards in front of the magnet poles for several minutes..
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page_text: Improvements in Electrical Indicators.
We HENRY GEORGE ELLERY, of 8 West Leigh Road, and JOHN THOMAS GENT,
of Narborough Road, both of Leicester, in the county of Leicester, Electricians,
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:―
This invention relates to improvements in the construction of electrical pendulum
indicators the object being to simplify and lessen the cost of construction of the
parts at the same time rendering the apparatus more effective than hitherto.
The invention consists in securing the electro magnet by means of its projecting
poles which are driven into or screwed to a bracket carrying a moving or
swinging pendulum as hereinafter described.
In order to enable our invention to be fully understood we will describe the
same by reference to the accompanying drawing in which figure 1 is a plan and
figure 2 a vertical section of an electrical indicator constructed according to our
invention. Similar letters in both the figures represent similar parts.
a, is the magnet which may be of any suitable construction and has one or
both of its poles surrounded by an insulated wire coil b, through which a current
of electricity can be made to pass and magnetise the iron poles a thereby converting
them, while the electricity is passing, into an electro magnet.
The pendulum is constructed of a soft iron armature c, suspended upon steel
knife edges d, d; from the armature c, passes a metal rod e, to which the indicating
tablet f, is attached; we provide a bracket g, gl, of the shape shewn in the drawing
so that it forms in one piece the two bearings for the knife edges of the pendulum
armature and the support for the magnet; h, h, represent the bearings for the
knife edges d, d, the said bearings consisting of holes made in the two sides g, g, of
the bracket.
The poles a, of the magnet project beyond the reels b, containing the wire,
and two holes are provided in the part g³, of the bracket to fit and receive
the said projecting poles. We drive the poles a, firmly into the part g¹, of the
metal bracket or secure the same by screwing or otherwise, the projecting poles
being cut to the required length to correctly act upon the swinging armature c,
which as already described is suspended in the sides g, g, of the same bracket.
The bracket g, g¹, is provided with lugs k, k, for fastening it to the case A (a portion
only of which is shewn in the drawing) in which it is to be used.
The operation is as follows: a current of electricity is sent through the magnet a,
so as to attract and pull the armature c, of the pendulum f, up to the poles; when
the current is broken the armature c, is allowed by its own weight to swing away
from the poles of the magnet a, and by means of the impetus it will continue to
move backwards and forwards in front of the magnet poles for several minutes
thereby giving the required indication.

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
1. In an electrical indicator the combination with an electro magnet having its
poles projecting beyond the insulated wire coil or coils, of a bracket carrying a
moving or swinging pendulum the said projecting poles being driven into or
screwed to the said bracket substantially as herein before described.
2. The improved electrical indicator herein before described and represented in
the accompanying drawing.