IMPROVEMENTS IN TELEGRAPHIC AND TELEPHONIC WIRE
Year: 1883

page_text: LETTERS PATENT to Lyman Elmore of the Oity, County and State of New
York United States of America, but temporarily of 53 Chancery Lane in the
County of Middlesex for an Invention of "IMPROVEMENTS IN TELEGRAPHIC
AND TELEPHONIC WIRE Communicated to him from abroad by William
B Hollingshead of the City County and State of New York United States
of America Electro Metallurgist
נו
PROVISIONAL SPECIFICATION left by the said Lyman Elmore' at the
Office of the Commissioners of Patents on the 2nd April 1883.
ני
LYMAN ELMORE of the City County and State of New York, United States of
America but temporarily of 53 Chancery Lane in the County of Middlesex
"IMPROVEMENTS IN TELEGRAPHIC AND TELEPHONIC WIRE a communication to ine
from abroad by William B Hollingshead of the City, County and State of New
York United States of America Electro Metallurgist
This invention relates to wire particularly adapted for telegraphic and telephonic
communication
According to this invention the core of the wire is made preferably of steol
around which in the form of a close spiral is wound copper wire, electrical connection
being assured between the surfaces of said copper wire by means of electro deposition
of a copper coating.
The principal advantages of this system being that great strength and stiffness
is secured by the steel core while increased conductivity is obtained by the copper
covering which is secured much more rapidly and economically by depositing the
copper upon copper than is possible when depositing an equal thickness of copper
directly upon the centre core of Iron or Steel. Under certain circumstances it is
sometimes advisable to run the coiled wire through a bath of solder or other
suitable material for the purpose of filling the interstices between the copper
coils and thus obtaining a smooth surface for the subsequent electro deposition
of the copper

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent
filed by the said Lyman Elmore in the Great Seal Patent Office on the
1st October 1883.
LYMAN ELMORE of the City County and State of New York, United States
of America but temporarily of 53 Chancery Lane in the County of Middlesex
་་ IMPROVEMENTS IN TELEGRAPHIC AND TELEPHONIC WIRE" A communication to
me from abroad by William B Hollingshead of the City County and State of New
York, United States of America. Electro Metallurgist
This Invention relates to wire particularly adapted for telegraphic and telephonic
communication
According to this invention the core of the wire is made preferably of steel,
around which, in the form of a close spiral is wound copper wire, electrical
connection being assured between the surfaces of said copper wire by means of
electro deposition of a copper coating. The principal advantages of this system
being that great strength and stiffness is secured by the steel core, while increased
conductivity is obtained by the copper covering which is secured much more
rapidly and economically by depositing the copper upon copper than is possible
when depositing an equal thickness of copper directly upon the centre core of Iron
or Steel.
Under certain circumstances it is sometimes advisable to run the coiled wire
through a bath of solder or other suitable material for the purpose of filling the
interstices between the copper coils and thus obtaining a smooth surface for the
subsequent electro deposition of the copper, or this second casing may be applied
over the copper coating, and late experiments have led me to believe that this is
the better course The coating and casing cement the covering wire and increase
the conductivity In coiling the covering wire over the core wire, the coils should
be close together so that the successive coils touch and leave no spaces between
them, and form one continuous mass. The core wire may be of one wire or more,
of iron steel galvanized or tinned iron or steel or other suitable wire, and tho
covering wire may be of one wire or more of copper or other good conducting
material.
The capacity of the compound wire may be increased by encasing the core wire,
and first coiled covering wire and coating by some insulating casing as rubber and
then covering this casing by another coil of conducting wire and coating; in like
manner a third coiled covering may be applied and so on as far as practical, and
then applying a suitable casing over the last coating In consequence of the
coiled covering wire, the continuity of the covering wire is not liable to become
broken in making joint and splicing and thereby cause leaks, and the expansion
and contraction of the core wire would simply tend to separate the coils and not
break the covering wire or interrupt its conductivity and no serious results
follow the breaking of the deposited coating The details of construction and
operation may be varied within the scope of the improvements, for example, the
first coiled covering may not have a coating of deposited metal, which may only
be applied to the outer coiled covering wire Although the compound wire above
described is particularly adapted for telegraphic and telephonic communication I do
not confine myself to its use solely for those purposes as it may also with advantage
be used for winding the armatures of Dynamo machines and for other electrical
purposes

page_text: Having described the nature of the invention as communicated to me by my
foreign correspondent What I claim and desire to secure by Letters Patent is
The improved compound wire particularly adapted for telegraphic
and telephonic communication (but applicable for other electrical
purposes) substantially as described
In Witness whereof I the said Lyman Elmore have hereunto set my hand
and seal this twentieth day of September in the year of our Lord One thousand
eight hundred and eighty three.
Signed sealed and delivered
in the presence of
PHILIP M. JUSTICE
Fel. Inst. P.A.
55 & 56 Chancery Lane
London
LYMAN ELMORE (L.S.)