Year: 1888

page_text: Date of Application, 22nd Feb., 1888
Complete Specification Left, 22nd Nov., 1888
Complete Specification Accepted, 22nd Jan., 1839
I, JOHN VAUGHAN SHERRIN of Codrington Road Ramsgate in the County of Kent
Electrical Engineer do hereby declare the nature of this invention to be as follows:-
I construct the field magnets and the armature in dynamo machines and electro-
motors of laminated form all as hereinafter described. For this purpose I stamp out
the lamina of charcoal iron and enamel them after having first coated them with
copper, tin, nickel or metal oxide by means of electrodeposition. The parts are united
by through bolts and insulated by washers of vulcanite fibre, asbestos or other suitable
material. The armature plates or laminæ are made with outer projections or not. The
field magnet plates or laminæ are jointed at the top in the manner and of a form
somewhat similar to a pair of calipers so that they can be pulled apart for winding
and then pushed together their circular parts then embracing the two sides of the
armature. In order to increase the acting surface I provide the ends of the field
magnet with plates which partly cover the ends of the armature. For additional
security and convenience I provide two commutators one at each end of the armature
and either of which can be worked by putting the brushes into contact. This is of
especial value in an electrolocomotive.
JOHN VAUGHAN SHERRIN.
By Jensen & Son,
77, Chancery Lane, London, W.C.,
Patent Agents.

page_text: I, JOHN VAUGHAN SHERRIN of Codrington Road Ramsgate in the County of Kent
Electrical Engineer do hereby declare the nature of the said invention and in
what manner the same is to be performed to be particularly described and
ascertained in and by the following statement :-
I construct the field magnets and the armature in dynamo machines and electro-
motors of laminated form all as hereinafter described. For this purpose I stamp out
the laminæ of charcoal iron and enamel or varnish them after having first coated them
with copper, tin, nickel or metal oxide by means of electro deposition. The parts are
united by through bolts and insulated by washers of vulcanite fibre, asbestos or other
suitable material. The armature plates or laminæ are made with outer projections
or not. The field magnet plates or laminæ are by preference jointed at the top
in the manner and of a form somewhat similar to a pair of calipers so that they can
be pulled apart for winding and then pushed together their circular parts then
embracing the two sides of the armature. In order to increase the acting surface, I
provide the ends of the field magnet with plates which partly cover the ends of the
armature. For additional security and convenience I provide two commutators one
at each end of the armature and either of which can be worked by putting the brushes
into contact. This is of especial value in an electrolocomotive.
In the accompanying drawings figure 1 shows one form of laminated field magnet A
and armature B.
The parts A and B are stamped out of thin charcoal iron and coated and enamelled
as stated or the coating may be omitted if the enamelling is good. They are held
together by through bolts A¹ and B₁ with intermediate washers of vulcanite or
other suitable insulating material. But I find that when the laminæ are well
enamelled no such washers are needed in electromotors. From the side view figure 2,
end view figure 3 and plan, Figure 4 of a dynamo made with such laminæ the
preferred mode of winding will be understood.
The ends of the field magnet I sometimes provide with plates to partly cover the
ends of the armature as shown at C figure 1.
Figure 5 shows another form of field magnet A and armature B the latter being
formed with outer projections B². The end of the field magnet is shown at C provided
with a plate C to partly cover the armature. Figure 6 is a side view, Figure 7 an
end view and figure 8 a plan of a dynamo made with such laminæ. The field magnet A
may as shown in dotted lines figure 5 be made with two elongated caliper shaped
ends instead of one as shown in full lines and as shown in figures 6, 7 and 8.
Instead of enamel 1 may use copal varnish or the like.
I find it advantageous to make every other or every third of the lamina A in the
dynamo of tempered steel, thus keeping a constant pole, the steel always remaining

page_text: magnetized and keeping a pretty constant magnetic field. These motors are suitable
for continuous as well as alternating current.
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
1 claim is :-
First Field magnets made of iron laminæ of such thickness as to be conveniently
stamped, and coated with enamel for insulation substantially as set forth.
Second-The field magnets A with end covering plates C substantially as set
forth.
Third: The constructions of electro motor and dynamo as described with reference
to the drawing.

page_text: This Specification was, upon the 24th day of October 1890, Amended under
Sections 18 to 21 of the Patents, Designs, and Trade Marks Act, 1883.
[The Amendments are shown in erased and italic type.]
JOHN VAUGHAN SHERRIN.
By Jensen & Son,
77, Chancery Lane, London, W.C.,
Patent Agents.

page_text: Improvements in Dynamo Machines and Electromotors.
I, JOHN VAUGHAN SHERRIN of Codrington Road Ramsgate in the County of Kent
Electrical Engineer do hereby declare the nature of the said invention and in
what manner the same is to be performed to be particularly described and
ascertained in and by the following statement :—
I construct the field magnets and the armature in dynamo machines and electro-
motors of laminated form all as hereinafter described and shewn. For tuis purpose
I stamp out the laminæ of charcoal iron and enamel or varnish them after baving first
coated them with copper, tin, nickel or metal oxide by means of electro deposition.
The parts are united by through bolts and insulated by washers of vulcanite fibre,
asbestos or other suitable material The armature plates or laminæ are made with
outer projections or not. The field magnet plates or laminæ are by preference
sometimes jointed at the top in the manner and of a form somewhat similar to a pair
of calipers so that they can be pulled apart for winding and then pushed together
their circular parts then embracing the two sides of the armature. In order to
increase the acting surface, I may provide the ends of the field magnet with plates
which partly cover the ends of the armature. For additional security and convenience
I may provide two commutators one at each end of the armature and either of which
can be worked by putting the brushes into contact. This is of especial value in an
electrolocomotive.
In the accompanying drawings figure 1 shows one form of laminated field magnet A
and armature B.
The parts A and B are stamped out of thin charcoal iron and coated and enamelled
as stated or the coating may be omitted if the enamelling is good. They are held
together by through bolts A' and B with intermediate washers of vulcanite or
other suitable insulating material without air spaces the field magnet forming a solid
block as shewn in the drawings. But I find that when the lamina are well enamelled
no such washers are needed in electromotors. From the side view figure 2, end view
figure 3 and plan, Figure 4 of a dynamo made with such lamine the preferred mode
of winding will be understood.
The ends of the field magnet I sometimes provide with plates to partly cover the
ends of the armature as shown at C figure 1.
Figure 5 shows another form of field magnet A and armature B the latter being
formed with outer projections B'. The end of the field magnet is shown at C provided
with a plate to partly cover the armature. Figure 6 is a side view, Figure 7 an
end view and figure 8 a plan of a dynamo made with such laminæ. The field magnet A
may as shown in dotted lines figure 5 be made with two elongated caliper shaped
ends instead of one as shown in full lines and as shown in figures 6, 7 and 8.
Instead of enamel I may use copal varnish or the like.
I find it advantageous to make every other or every third of the lamina A in the
dynamo of tempered steel, thus keeping a constant pole, the steel always remaining

page_text: magnetized and keeping a pretty constant magnetic field. These motors are suitable
for continuous as well as alternating current.
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 I do
not claim generally field magnets made of iron lamine, nor do I claim field magnets
made of iron lamine with intermediate insulating washers extending merely around the
bolts for holding the lamina together and leaving air spaces everywhere else between the
lamince but what I claim is :-
--
First Field magnets made of iron lamina of such thickness as to be conveniently
stamped, stamped out of thin sheets of charcoal iron and coated with enamel for
insulation substantially as set forth and
Second The field magnets A with end covering plates-C substantially as set
forth united as described and shewn in the drawings.
Third Second: The constructions of electro motor and dynamo as described with
reference to the drawing.
Dated this 22nd day of November 1888
JOHN VAUGHAN SHERRIN.
By Jensen & Son,
77, Chancery Lane, London, W.C.,
Patent Agents.