IMPROVEMENTS IN THE MANUFACTURE OF MATERIAL FOR ELECTRIC INSULATION
Year: 1883

page_text: LETTERS PATENT to William Virgo Wilson of Jubilee Street Mile End in the
County of Middlesex Color Manufacturer, for an Invention of IMPROVEMENTS
PROVISIONAL SPECIFICATION left by the said William Virgo Wilson at the
Office of the Commissioners of Patents on the 11th July 1883.
WILLIAM VIRGO WILSON of Jubilee Street Mile End in the County of Middlesex
Colour Manufacturer. IMPROVEMENTS IN THE MANUFACTURE OF MATERIAL FOR
ELECTRIC INSULATION
"
This Invention has for its object the Consolidation of Wood or Vegetable Tar
by means of Nitro-cellulose, the nitration of which has not been carried beyond
the point which will effect its greatest solubility, a modification of this body quite
well understood.
Both these before mentioned substances are well known to have considerable
non-conducting properties and when properly incorporated by the intervention of
some of the well known Solvents of Nitro-cellulose such as Methylic or Ethylic
Alcohol and Mineral Naptha & & the resulting compound possesses very high
Insulating power
In practice I take 200 parts of the Tar above named and raise its temperature
to about 200 degrees farh and I then add 100 parts of the Nitro-cellulose prepared
as above described and softened by one or more of the Solvents, to which allusion
has been already made, by a now well ascertained process.
Although I have found the above proportions and temperature advantageous I
do not confine myself to them
The Mixture I then thoroughly incorporate and transfer to a Masticating.or
Grinding Machine by preference to the latter constructed in a similar manner to
machines now in operation for the trituration of Gutta Percha and India
Rubber.
.

page_text: When the Mass in the machine has become homogeneous, it is ready for
application to the purposes of Insulation in all its branches and I use this mixture
for Insulating Electric conductors by means of any of the ordinary covering
machinery now employed for such purposes in a manner well understood
This Mixture I apply in its present condition, or I further mix or compound it
with one or more of the following substances such as Barium, Sulphate, Chalk,
Talc, Calcium Sulphate, Alumina, Magnesia, Oxide Zinc Silica & whereby the
Mixture is rendered cheaper and its combustibility reduced
These may be mixed during any stage of the manufacture but I prefer to incor-
porate them while the mass of material is in the Masticating or Grinding
Machine

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Virgo Wilson in the Patent Office on the 10th January
1884.
WILLIAM VIRGO WILSON of Jubilee Street Mile End in the County of Middlesex.
Color Manufacturer "IMPROVEMENTS IN THE MANUFACTURE OF MATERIAL FOR
ELECTRIC INSULATION
"
This Invention has for its object the consolidation of Wood or vegetable Tar by
means of Nitrocellulose the nitration of which has not been carried beyond the
point which will effect its greatest solubility, a a modification of this body quite
well understood
Both these before mentioned substances are well known to have considerable
nonconducting properties and when properly incorporated by the intervention of
some of the solvents of Nitrocellulose such as Methylic Alcohol or Ethylic Alcohol
and Mineral Naptha, or other well known solvents, the resulting compound
possesses very high insulating power
In practice I take 200 parts of the Tar above named and raise its temperature
to about 200 degrees Fahr and I then add 100 parts of the Nitrocellulose, prepared
as above described and softened by one or more of the solvents to which allusion
has been already made, by a now well asceratined process
Although I have found the above proportions and temperature advantageous I
do not confine myself to them
The mixture I then thoroughly incorporate and transfer to a Masticating or
Grinding Machine, by preference to the latter constructed in a similar manner
to machines now in operation for the trituration of Gutta Percha and India
Rubber
When the mass in the machine has become homogeneous it is ready for application
to the purpose of Insulation in all its branches, and I use this mixture for
Insulating Electric conductors, by means of the ordinary covering machinery now
employed for such purposes, in a manner well understood
This mixture I apply in its presents condition, or I further mix or compound it
with one or more of the following substances such as Barium Sulphate, Chalk,
Talc, Calcium Sulphate, Alumina, Magnesia, Oxide Zinc, Silica whereby the
mixture is rendered cheaper and its combustibility reduced
These may be mixed during any stage of the manufacture, but I prefer to
incorporate them while the mass of material is in the Masticating or Grinding
Machine
Having thus described the nature of my Invention and the manner of
performing the same I would have it understood that what I claim is the consoli-
dation of Wood or Vegetable Tar by the use of Nitrocellulose softened as therein
before set forth and its application to the purpose of Insulating Electric Conducting
Wires
In Witness whereof I the said William Virgo Wilson have hereunto set my hand
and seal this tenth day of January in the year of Our Lord One thousand eight
hundred and eighty four
W. V. WILSON (L.S.)