IMPROVEMENTS IN APPARATUS FOR GENERATING ELECTRIC CURRENTS."
Year: 1882

page_text: LETTERS PATENT to John Medley Stuart, of Queen Victoria Street, in the
city of London, Engineer, for an invention of "IMPROVEMENTS IN APPARATUS
FOR GENERATING ELECTRIC CURRENTS."
PROVISIONAL SPECIFICATION left by the said John Medley Stuart at the
Office of the Commissioners of Patents on the 11th May 1882.
JOHN MEDLEY STUART of Queen Victoria Street in the City of London Engineer
"IMPROVEMENTS IN APPARATUS FOR GENERATING ELECTRIC CURRENTS."
This Invention relates to that class of apparata employed for the generation of
electric currents, known as Dynamo machines and the invention consists of the
combination and arrangement of parts as hereinafter set forth The armatures are
formed of soft iron cylinders of suitable dimensions, one end of each cylinder being
closed by a plate attached to a suitable shaft supported in bearings and carrying
an ordinary driving pulley. Opposite the first described cylindrical armature is a
second plate with its shaft bearings and pulley, and attached to said plate are two
additional cylindrical armatures one of which passes within while the other
surrounds the first cylinder
Although only three armatures are described, the system is applicable to four or
even more All the cylinders which are to form the armatures are wound
longitudinally either with the ordinary wire or with a combination wire formed of
a small soft iron core around and insulated from which, is wound copper wire In
this the preferred method each combination wire is in itself an electro inagnet
The plates carrying the cylindrical armatures are revolved in reverse directions, so
that the currents cross each other in opposite directions There is generated in this
manner a combination of currents which proceed in opposite directions and greatly
increase the power of the machine Surrounding or partly surrounding the
armatures are placed electro magnets which may be of ordinary construction but
it is preferred to build them up of the combination wire before described
The armatures being made to revolve the currents generated are collected and
carried to the desired places by means of the ordinary apparata now employed for
that purpose.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said John Medley Stuart in the Great Seal Patent Office on the
11th November 1882.
JOHN MEDLEY STUART of Queen Victoria Street, in the City of London Engineer,
IMPROVEMENTS IN APPARATUS FOR GENERATING ELECTRIC CURRENTS
This Invention relates to that class of apparata employed for the generation of
electric currents known as Dynanro machines, and the invention consists of the
combination and arrangement of parts as hereinafter set forth. The armatures are
formed of soft iron cylinders or cylinder sections of suitable dimensions, one end of
each cylinder or section being secured to a plate attached to a suitable shaft
supported in bearings and carrying an ordinary driving pulley Opposite the first
described cylindrical armature is a second plate with its shaft, bearings and pulley
and attached to said plate are one or more additional cylindrical armatures If
there are two, as is preferred, one passes within while the other surrounds the
first cylinder or section Although only three armatures are described the system
is applicable to four or even more All the cylinders or sections which are to form
the armatures are wound longitudinally either with the ordinary wire or with a
combination wire formed of a small soft iron core, around and insulated from
which is wound copper wire In this, the preferred method each combination wire
is in itself an electro magnet The plates carrying the cylindrical armatures are
revolved in reverse directions so that the currents cross each other in opposite
directions There is generated in this manner a combination of currents which
proceed in opposite directions and greatly increase the power of the machine
Surrounding or partly surrounding the armatures are placed electro magnets which
may be of ordinary construction, or they may be built up of the combination wire
before described The armatures being made to revolve, the currents generated are
collected and carried to the desired places by means of the ordinary apparata now
employed for that purpose To more clearly explain the nature of my invention
and how the same may be practically employed reference is made to the
accompanying drawings which form part of this specification, and in which
similar letters of reference indicate corresponding parts throughout all the figures
thereof
Fig I represents a central longitudinal section of a machine with three revolving
armatures
Fig II represents a cross section of Fig I
In the drawings the armatures are represented as being formed of soft iron bars
or cores A. A' secured to end plate B B by bolts C C¹ The bars or cores being
held equidistant by means of two or more soft iron rings or segments D D' upon
which the ordinary copper or the combination wire before described, is wound
The bars or cores A A' are arranged on the plates B B' in such a manner that,
when say at four points the bars or cores A A are opposite the bars or cores A³,
the intermediate bars or cores will be opposite or approximately opposite to the
wire coils on the cylinder or cylindrical section next in order which it surrounds or
by which it is surrounded. The field magnets E E' are shown as being of soft
iron wound at their sides with the ordinary or with the combination wire The
shafts F. F' carrying the plates B B and the ordinary driving pulleys, also carry
the commutators G G' which may be of any known and practical form and to, and
from said commutators, the electric currents generated are conducted in the
ordinary manner. The manner of joining up the coils or wires at the ends of the
machine will be readily understood by persons skilled in the art as any suitable

page_text: and convenient arrangement may be employed When the shafts F F¹ with their
connected parts are revolved in opposite directions at a suitable speed, a large
amount of current will be generated which may be utilized as, and where desired
Having thus described my invention and how the same may be practically
employed What I claim and desire to secure by Letters Patent is :—
1st The improvements in apparatus for generating electric currents hereinbefore
described consisting of the application and use in such apparatus of two or more
armatures composed of cylinders or cylindrical sections suitably wound and
mounted and capable of motion in opposite directions substantially as and for the
purposes set forth
2nd In apparatus for generating electric currents the application and use, for
the purpose of winding the electro magnets, of a combination wire consisting of a
soft iron core wound with and insulated from copper wire substantially as
herein before described.
3rd In apparatus for generating electric currents the method of forming the
armatures as herein before described consisting of securing the cores or bars to
suitable end plates, capable of revolution in opposite directions said cores being kept
equidistant by means of rings or segments upon which the wire is wound all
substantially as and for the purposes set forth
In Witness whereof I the said John Medley Stuart have hereunto set my
hand and seal this tenth day of November in the year of Our Lord one
thousand eight hundred and eighty two.
Signed, sealed and delivered
in the presence of
ALLEN P JONES
53 Chancery Lane
London WC.
JOHN MEDLEY STUART (L.S.)