Improvements in Coatings or Coverings for Electric Conductors.
Year: 1893

page_text: Date of Application, 30th Mar., 1893
Complete Specification Left, 11th Dec., 1893-Accepted, 13th Jan., 1894
PROVISIONAL SPECIFICATION.
Improvements in Coatings or Coverings for Electric Conductors.
I, CHARLES THELISMAR SNEDEKOR of 94 Grove Street, Worcester, in the
United States of America, Superintendent of Manufactures, do hereby declare the
nature of this invention to be as follows
11
This invention relates to the coatings or coverings of electric conductors,
whereby the same are effectively insulated and also rendered fireproof, thus,
obviating the principal dangers heretofore incidental to the use of electric lighting.
systems.
According to the present invention it is proposed to proceed as follows:-
The wire or core is preferably of copper, tinned and covered with vulcanized
rubber in the usual way. Upon the vulcanized rubber is then applied a special
flexible cement or coating composed of magnesia talc, finely ground asbestos, liquid
glue, glycerine, bichromate of soda or potash, and where a darkish covering is
wanted a small quantity of lamp black. This cement may be intimately mixed in
a mortar or like mill. The conductor thus coated may be then taped or braided
and run through a bath, or externally saturated with a solution of silicate of soda
and alum, and after this has dried a final finish is given by a coating of bisulphide
of carbon and asphalt.
Conductors so prepared are not only thoroughly insulated but are also capable of
resisting internal and external heat.
Dated the 30th day of March 1893.
PHILIP M. JUSTICE,
55 & 56, Chancery Lane, London, Chartered Patent Agent.
COMPLETE SPECIFICATION.
Improvements in Coatings or Coverings for Electric Conductors.
I, CHARLES THELISMAR SNEDEKOR of 94 Grove Street, Worcester, in the
United States of America, Superintendent of Manufactures, 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 :-
This invention relates to the coatings or coverings of electric conductors
whereby the same are effectively insulated and also rendered fireproof, thus
obviating the principal dangers heretofore incidental to the use of electric lighting
systems.
According to the present invention it is proposed to proceed as follows:-
2
of
The wire or core is preferably of copper, tinned and covered with vulcanized
rubber in the usual way. Upon the vulcanized rubber is then applied
special flexible cement or coating composed of magnesia about 40 parts, talc
about 28 parts, finely ground asbestos about 15 parts, liquid glue about
30 parts, glycerine about 15 parts, bichromate of soda or potash about
one part, and where a darkish covering is wanted a small quantity about of
one part of lamp black. This cement may be intimately mixed in a mortar
or like mill. The conductor thus coated may be then taped or braided in
any of the usual ways and run through a bath, or externally saturated with a
solution formed of silicate of soda about 60 pounds, and alum about 15 pounds
Price RI

page_text: dissolved in about 40 gallons of water, and after this has dried a final finish is given
by a coating formed of bisulphide of carbon about 40 pounds, and asphalt about
8 pounds.
Conductors so prepared are not only thoroughly insulated but are also capable
of resisting internal and external heat.
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 :-
1. The improved coating or covering for electric conductors composed of
magnesia, talc, asbestos, liquid glue, glycerine, and bichromate of soda or potash.
2. Insulating and rendering fireproof electrical conductors by coating or
covering them with the material set forth in the preceding claim, and then braiding
or taping same and saturating with a solution of silicate of soda and alum, with or
without a final finish imparted by a mixture of bisulphide of carbon and asphalt.
Dated the 7th day of December 1893.
PHILIP M. JUSTICE,
55 & 56, Chancery Lane, London,
Chartered Patent Agent for the Applicant.
PHILIP M. JUSTICE,
55 & 56, Chancery Lane, London,
Chartered Patent Agent for the Applicant.