Year: 1888

page_text: Date of Application, 11th June, 1888
Complete Specification Left, 11th Apr., 1889
Complete Specification Accepted, 25th May, 1889
We FREDERICK LAWRENCE RAWSON of 11 Queen Victoria Street London EC.
Electrical Engineer, and PHILIP JOHN of 35 Narrow Wine Street Bristol Electrical
Engineer, do hereby declare the nature of this invention to be as follows:-
Our invention relates to improvements in Electric Trembling bells whereby they
are rendered extremely simple in construction and very compact in appearance, and
consists in constructing the base plate, single or double magnet core with cheeks, and
pillar for carrying dome in one piece, conveniently in soft and annealed cast iron."
The said base plate is of any suitable form but preferably of a diamond shape, tho
axis of the magnet core being in a plane parallel to the base and projecting outwards
at one of the angles of the diamond shaped base, and the pillar for carrying the dome
being at the opposite corner: the terminals are placed at the two remaining corners,
one of the said terminals being insulated. The wire is wound on the iron core
between the two cast iron cheeks thus forming the bobbin, the iron being previously
covered with insulating material in the usual manner The armature is attached by a
flat spring to the outer end cheek of the bobbin and extends across the two cheeks,
which also form the magnet poles, thereby completing the magnetic circuit. The
hammer may be attached to the loose end of the armature by a wire which is bent
under the dome so as to strike it inside thereby making the whole bell more compact.
The contact pillar is fixed at one side of the diamond" base and insulated. Screw
holes are provided in the base for convenience in fastening to a wall.
TA T TAWAON

page_text: We FREDERICK LAWRENCE RAWSON of 11 Queen Victoria Street London E.C.
Electrical Engineer, and PHILIP JOHN of 35 Narrow Wine Street, Bristol Electrical
Engineer, 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:―
Our invention relates to improvements in Electric Trembling Bells whereby they
are rendered extremely simple in construction and very compact in appearance and
consists in constructing the base plates single or double magnet core with cheeks and
pillar for carrying dome in one piece conveniently in soft and annealed cast iron.
The said base plate is of any suitable form but preferably of a diamond shape the
axis of the magnet core being in a plane parallel to the base and projecting outwards
at one of the angles of the diamond shaped base and the pillar for carrying the dome
being at the opposite corner, the terminals are placed at the two remaining corners,
one of the said terminals being insulated.
Alternately we make the plate which is cast in one with the bobbin of a very small
size so as just to be large enough to carry the contact pillar. The end of the bobbin
opposite to that which carries the small base plate has attached to it the spring
support of the vibrating armature and by a stud fixed in the centre of this cheek the
bobbin with the whole of the working parts 13 supported inside a bell of any suitable
form but preferably of the church bell type In both forms the wire is wound on
the iron core between the two cast iron cheeks thus forming the bobbin, the iron
being previously covered with insulating material in the usual manner. In the first
form herein described the armaturo is attached by a flat spring to the outer end cheek
of the bobbin and in both forms it extends across the two cheeks, which also form
magnet poles thereby completing the magnetic circuit
The hammer may be attached to the loose end of the armature by a wire which is
bent under the dome so as to strike it inside thereby making the whole bell very
compact. The contact pillar is tixed at one side of the diamond or other shaped base
and insulated. In the first form screw holes are provided in the base for convenience
in fastening to a wall
We sometimes form the frame or base of a convenient size and shape and place the
whole mechanism under a dome of suitable shape as shewn in figure 4.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare what we claim is
1 In electric bells the making of the base plate and the core and cheeks of the
electro magnet in one substantially as described.

page_text: 2. In electric bells the making of the base plate core and cheeks of the electro
magnet and the bell supporting stem in one substantially as described.
3. An electric bell substantially as described and shewn in figure No. 1.
4. In electric bells the forming of the core and cheeks of the electro magnet in one
casting and hanging the armature by a spring fastened to one of the end cheeks
substantially as described and illustrated.
5. In electric bells the arrangement for the placing of the electro magnet and
other parts under the bell itself, substantially as described and shewn in figure 4.
D1: 1112
1000
F. L. RAWSON.
P. JOHN.