A NEW OR IMPROVED COMPOUND OR SUBSTANCE FOR INSULATING AND OTHER PUR- POSES.
Year: 1879

page_text: · LETTERS PATENT to Frederick Sanders and Ludwig Danckwerth, both of
St. Petersburgh, in the Empire of Russia, for the Invention of "A NEW OR
IMPROVED COMPOUND OR SUBSTANCE FOR INSULATING AND OTHER PUR-
POSES.
"
"
PROVISIONAL SPECIFICATION left by the said Frederick Sanders and
Ludwig Danck werth at the Office of the Commissioners of Patents on the 21st
May 1879.
FREDERICK SANDERS and LUDWIG DANCKWERTH, both of St. Petersburgh, in
the Empire of Russia. "A NEW OR IMPROVED COMPOUND OR SUBSTANCE FOR
INSULATING AND OTHER PURPOSES."
Our Invention has reference to the manufacture of a new compound or substance
that we call "electra-compound," which is applicable to the purposes for which
india rubber or caoutchouc and gutta percha have ordinarily been employed. This
new product is intended to be used either alone or in combination with india rubber
and gutta percha or similar resins.
The process of manufacture is as follows:-One third of a given quantity by
weight of a mixture composed of equal parts of vegetable tar oil and coal tar
oil (in some cases coal tar oil only) is heated in a boiler of large dimensions, either
by means of superheated steam or over a fire, with another third of linseed oil in
order to evaporate those parts which are noxious to the composition and to con-
centrate the mass at a temperature of about 140 to 150 degrees centigrade. The
boiling of the said mixture should be carried on until the mass becomes of a
stringy character.
To the said mixture is now added the last third by weight of linseed oil, and it
is preferred to boil the linseed oil until it thickens before it is added.
To the above composition is added from one twentieth to one tenth part of
ozokerit for every hundred parts of the composition, also a little spermaceti is added
while the mass is again exposed to the same temperature for several hours; and,
finally, from one fifteenth to one twelfth part by weight of sulphur for every
hundred parts is introduced. The compound or substance thus produced is to be
shaped as required or worked up similarly to caoutchouc.
The relative proportions of the above ingredients may be varied as required, in
order to produce results of a more elastic or a harder nature or quality. The said
compound or substance, besides being applicable to the ordinary uses of india rubber
and gutta percha, is also specially applicable as an insulating material for cables and
other wires for electric and telegraphic purposes.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Frederick Sanders and Ludwig Danckwerth in the Great Seal Patent
Office on the 21st November 1879.
FREDERICK SANDERS and LUDWIG DANCKWERTH, both of St. Petersburgh, in
the Empire of Russia. "A NEW OR IMPROVED COMPOUND OR SUBSTANCE FOR
INSULATING AND OTHER PURPOSES."
"
Our Invention of "A New or Improved Compound or Substance for Insulating and
other Purposes " has reference to the manufacture of a new compound or substance
that we call electra-compound," which is applicable to the purposes for which
india rubber or caoutchouc and gutta percha have ordinarily been employed. This
new product is intended to be used either alone or in combination with india rubber
and gutta percha or similar resins.
The process of manufacture is as follows:-One third of a given quantity by
weight of a mixture composed of equal parts of vegetable tar oil and coal tar oil
(in some cases coal tar oil only) is heated in a boiler of large dimensions, either by
means of superheated steam or over a fire, with another third of hemp seed oil, in
order to evaporate those parts which are noxious to the composition, and to concen-
trate the mass at a temperature of about one hundred and forty to one hundred
and fifty degrees centigrade.
The boiling of the said mixture should be carried on until the mass becomes of a
stringy character.
To the said mixture is now added the last third by weight of linseed oil, and it
is preferred to boil the linseed oil until it thickens before it is added.
To the above composition is added from one twentieth to one tenth part of
ozokerit for every hundred parts of the composition, also a little spermaceti is added
while the mass is again exposed to the same temperature for several hours; and,
finally, from one fifteenth to one twelfth part by weight of sulphur for every
hundred parts is introduced.
The compound or substance thus produced is to be shaped as required or worked
up similarly to caoutchouc.
The relative proportions of the above ingredients may be varied as required in
order to produce results of a more elastic or a harder nature or quality.
The said compound or substance, besides being applicable to the ordinary uses of
india rubber and gutta percha, is also specially applicable as an insulating material
for cables and other wires for electric and telegraphic purposes.
Having thus described the nature of the said Invention, and in what manner
the same is to be performed, we hereby declare that what we claim as of our Inven-
tion is, The manufacture of the improved compound or substance in the manner
and by the process herein before described.
In witness whereof, we, the said Frederick Sanders and Ludwig Danck werth,
have hereunto set our hands and seals, the Fourteenth day of November, in
the year of our Lord One thousand eight hundred and seventy nine.