IMPROVEMENTS IN DYNAMO ELECTRIC MACHINES FOR PLATING AND DEPOSITING METALS
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I, GEORGE FREDERICK CHUTTER of 48 Constitution Hill, Birmingham in the
county of Warwick Electrical Engineer do hereby declare the nature of my
invention for IMPROVEMENTS IN DYNAMO ELECTRIC MACHINES FOR PLATING
AND DEPOSITING METALS to be as follows:-
It applies principally to Dynamo Electric Machines having the magnetic axis
of their armature magnets at right angles to, or on radial lines from the axis of
the shaft of such armature, each separate and opposite or adjacent arm of such
magnets being connected magnetically through the shaft.
I make the shaft 'A' with the magnets 'N. S.' and communicator 'C' attached,
either of wrought, or malleable cast iron, having no joint between the magnets
and shaft or between the opposite poles or arms of the said magnets, the whole
to be one piece of metal. The chief aim of this my invention is to do away with
the residual and fixed magnetism (always present in steel shafts) which magnetism
conveys itself into the magnets fixed thereto, thereby adding a resistance to the
movement of the molecules in the rapid reversals of polarity the magnets of arma-
tures are subject to. This resistance makes itself apparent by the rapid heating
of the iron of such armatures, thereby lowering its magnetic intensity and adding
Electrical resistance to the wire on such armature.
Each magnet of this armature is furnished with a pole piece of breadth sufficient
to reach from one Field Magnet to the next, or the breadth and shape shall be
equal to the space between such Field Magnets, thereby preventing either a
definite break, or a short circuit, of the magnetic field and preventing the rising
and falling of the magnetic intensity of such Field Magnets, and the consequent
heating from this cause.

page_text: COMPLETE SPECIFICATION,
I, GEORGE FREDERICK CHUTTER, of 43 Hockley Hill, Birmingham, in the
county of Warwick, Electrical Engineer do hereby declare the nature of my
invention for IMPROVEMENTS IN DYNAMO ELECTRIC MACHINES FOR PLATING &
DEPOSITING METALS and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
E
It applies principally to Dynamo Electric Machines, having the Magnetic axis
of their Armature Magnets at right angles to, or on radial lines from, the axis
of the shaft of such armatures. Each separate and opposite or adjacent arm of
Buch magnets being connected magnetically through the shaft.
I make the shaft with the magnets and commutator attached, either of wrought 1
iron or of malleable cast iron, having no joint between the magnets and shaft
or between the arms of the magnets, the whole to be one solid piece of metal (as
A Fig I.)
The chief aim of this my invention is to do away with the residual and fixed
magnetism always present in Steel shafts; which residual and fixed magnetism 1
conveys itself into the magnets, thereby adding a resistance to the movement of
the molecules in the rapid reversals of polarity armature magnets are subject to,
causing heating in the iron, thereby lowering its magnetic intensity, and adding
Electrical resistance to the wire on such armature.
Each magnet is furnished with a pole piece of breadth sufficient to reach from 2
one Field magnet to the next (A Fig 2) or the breadth and shape shall be equal
to the space between the poles of the Field Magnets (F. M. Fig 2) this by pre-
venting a definite break or short circuit of the magnetic field will prevent the
rising and falling of the magnetic intensity of the field magnets, and the heating
arising from that cause.
Having now particularly described and ascertained the nature of my Baið
invention and in what manner the same is to be performed I declare that what
I claim is
1st An armature with shaft and commutator in one piece and without joint, as
set forth and described in my specification and shewn in the drawings.
2nd The general configuration of machine as shewn in drawings whereby the
armature claimed is made available for producing Electricity for the purpose set
forth in the title.
Dated this 18th 'doy of June 1885.
2