Improvements in Dynamo Electric Machines and Electro Magnets.
Year: 1887

page_text: Date of Application, 28th Jan.. 1887
Complete Left, 28th Oct., 1887
Complete Accepted, 2nd Dec., 1887
PROVISIONAL SPECIFICATION.
Improvements in Dynamo Electric Machines and Electro Magnets.
I ROBERT CATTLEY JACKSON of Firth Hotel Salisbury Street in the City of
London Electrical Engineer do hereby declare the nature of this Invention to be as
follows:-
My Invention has for its object to so improve Dynamo Electric Machines and
Electro Magnets as to obviate certain of the defects which have been incidental to the
use of the iron portions thereof as hitherto used-I have discovered that by substi-
iuting for the iron portions thereof as hitherto used an alloy of iron and aluminium a
very much improved effect is obtained as the said alloy is very uniform and has a very
high point of saturation or magnetic capacity exceeding that of Swedish charcoal Iron
which has been passed through a careful annealing process and has been hitherto
regarded as the material best suited to the purpose. A very suitable proportion is
1 part of Aluminium to 99 parts of iron but I do not limit myself to that proportion.
The use of Aluminium with Iron gives an alloy of a very uniform and homogeneous
character practically free from impurities and when used for the purpose of my
Invention its magnetic capacity or point of superation is considerably higher than
that of iron as hitherto used for the purpose--As an incidental advantage also the
alloy of iron with Aluminium is readily cast into clean sharp castings thus doing away
with much of the after work necessary upon the parts when made in the ordinary
way.
Dated this 28th day of January 1887
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London,
Agents for the said Robert Cattley Jackson.

page_text: COMPLETE SPECIFICATION.
Improvements in Dynamo Electric Machines and Electro Magnets.
I ROBERT CATTLEY JACKSON of Firth Hotel Salisbury Street in the City of London
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:-
My Invention has for its object to so improve dynamo electric machines and electro-
magnets as to obviate certain of the defects which have been incidental to the use of
the iron portions thereof as hitherto used.
I have discovered that by substituting for the iron portion thereof as hitherto used
an alloy of iron and aluminum a very much improved effect is obtained as the said
alloy is very uniform and has a very high point of saturation or magnetic capacity
exceeding for example that of Swedish charcoal iron which has been passed through a
careful annealing process and has been hitherto regarded as the material best suited
to the purpose.
A very suitable proportion of the metals of the alloy is one
part of aluminum to ninety nine parts of iron but I do not limit myself to that
proportion.
The use of aluminum with iron gives an alloy of a very uniform and homogeneous
character practically free from impurities and when used for the purposes of my
Invention its magnetic capacity or point of saturation is considerably higher than
that of iron as hitherto used for the purpose.
As an incidental advantage also the alloy of iron with aluminum is readily cast into
clean sharp castings thus doing away with much of the after work necessary upon the
parts when used in the ordinary way.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
In dynamo electric machines and electro-magnets the use of an alloy of iron with
aluminum substantially in the manner and for the purposes hereinbefore described.
Dated this 28th day of October 1887.