IMPROVEMENTS IN ASBESTOS SHEETS AND COMBINED ASBESTOS SHEETS
Year: 1880

page_text: LETTERS PATENT to Sydney Pitt, of Sutton, in the County of Surrey, for an
Invention of "IMPROVEMENTS IN ASBESTOS SHEETS AND COMBINED ASBESTOS
SHEETS." A communication from abroad by Henry W. Johns, of Brooklyn,
in the County of Kings, State of New York, United States of America.
PROVISIONAL SPECIFICATION left by the said Sydney Pitt at the Office
of the Commissioners of Patents on the 19th August 1880.
SYDNEY PITT, of Sutton, in the County of Surrey. IMPROVEMENTS IN ASBESTOS
SHEETS AND COMBINED ASBESTOS SHEETS." [A communication from abroad by
Henry W. Johns, of Brooklyn, in the County of Kings, State of New York, United
States of America.]
The asbestos sheet consists of a sheet of fibrous asbestos having on the surfaces
of the sheet a glutinous cementing material, so as to hold between the thus
cemented and fastened outside portions of the sheet a loose porous interior, and the
combination of this sheet having one or both sides thus cemented with hair felt or
other sheet.
To make the asbestos sheet according to the improvement fibrous or flaked
asbestos, alone or mixed with wool, cotton, or similar material (the asbestos
preferred alone), is deposited to any desired thickness on an apron or sheet;
this asbestos is wetted or coated with a glutinous liquid sizing, silicate of
soda, lime water, or other material which will make the fibres adhere to one
another. The sheet of asbestos is now turned over and the other side treated in
the same manner, i.e., wetted with glutinous matter, when it will be found that
the outsides or surfaces of the sheet are firmly united together, and that they
contain between them a porous or loose centre. The glutinous matter may be
applied to the two surfaces of the sheet at once by rollers or otherwise if preferred.
The sheet thus made is passed when sufficiently dry between pressure rollers,
which will firmly fasten the outer portions of the sheet.
Another portion of the Invention consists in attaching the above described
sheet to another sheet, such as hair felt, canvas, or paper, by means of adhesive or
glutinous matter, forming an asbestos lined sheet or felt fire proof, or nearly so.

page_text: The exposed surface of the asbestos in the combined sheet may be sized, as
described above, or left in a loose or flocky state as desired.
Another part of the Invention consists of an asbestos sheet or sheathing, having
a coating on one surface of fibrous asbestos united to the sheathing by silicate of
soda.
"Pure asbestos sheathing" (which is made from asbestos pure) is coated on one
side or surface with silicate of soda, and on the silicate of soda while still soft is
deposited fibrous asbestos from which impurities and dust have been removed;
this may be pressed on the sheathing, part way into the silicate of soda, or left as
it is deposited, as desired; the silicate of soda hardening unites the two and gives
a compound sheet indestructible by fire.
The removal of the impurities and dust from the fibrous asbestos permits the
fibrous asbestos to become more securely fastened to the silicate of soda and the
sheathing on which it is deposited, and enables the parts to be united in a firm
manner, as above described.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Sydney Pitt in the Great Seal Patent Office on the 19th February
1881.
SYDNEY PITT, of Sutton, in the County of Surrey. "IMPROVEMENTS IN
ASBESTOS SHEETS AND COMBINED ASBESTOS SHEETS." A communication from
abroad by Henry W. Johns, of Brooklyn, in the County of Kings, State of New
York, United States of America.
The asbestos sheet consists of a sheet of fibrous asbestos having on the surfaces
of the sheet a glutinous cementing material, so as to hold between the thus
cemented and fastened outside portions of the sheet a loose porous interior, and
the combination of this sheet having one or both sides thus cemented with hair
felt or other sheet.
To make the asbestos sheet according to the improvement fibrous or flaked
asbestos, alone or mixed with wool, cotton, or similar material (the asbestos
preferred alone), is deposited to any desired thickness on an apron or sheet; this
asbestos is wetted or coated with a glutinous liquid sizing, silicate of soda, lime-
water, or other material which will make the fibres adhere to one another. The
sheet of asbestos is now turned over and the other side treated in the same
manner, i.e., wetted with glutinous matter, when it will be found that the outsides
or surfaces of the sheet are firmly united together, and that they contain between
them a porous or loose centre. The glutinous matter may be applied to the two
surfaces of the sheet at once by rollers or otherwise if preferred.
The sheet thus made is passed, when sufficiently dry, between pressure rollers,
which will firmly fasten the outer portions of the sheet.
Another portion of the Invention consists in attaching the above described
sheet to another sheet, such as hair felt, canvas, or paper, by means of adhesive or
glutinous matter, forming an asbestos lined sheet or felt fire proof, or nearly so."
The exposed surface of the asbestos in the combined sheet may be sized, as
described above, or left in a loose or flocky state, as desired.
Another part of the Invention consists of an asbestos sheet or sheathing, having
a coating on one surface of fibrous asbestos united to the sheathing by silicate of
soda.
"Pure asbestos sheathing" (which is made from asbestos pure) is coated on one
side or surface with silicate of soda, and on the silicate of soda while still soft is
deposited fibrous asbestos from which impurities and dust have been removed;
this may be pressed on the sheathing, part way into the silicate of soda, or left as
it is deposited, as desired; the silicate of soda hardening unites the two and gives
a compound sheet indestructible by fire.
The removal of the impurities and dust from the fibrous asbestos permits the
fibrous asbestos to become more securely fastened to the silicate of soda and the
sheathing on which it is deposited, and enables the parts to be united in a firm
manner, as above described.
What I claim as new is,-
First. As a new article of manufacture a flexible sheet wadding or batling
composed of fibrous asbestos, the outside or surface portions of which are united by
a glutinous substance, substantially as specified and set forth.
Second. As a new article of manufacture a sheet of fibrous asbestos attached to
hair felt or other sheet, substantially as described.
Third. The compound sheet consisting of asbestos sheathing united with fibrous
asbestos by silicate of soda, substantially as specified and set forth.

page_text: Fourth. The pure fibrous asbestos combined with a sheet of sheathing by a
glutinous substance, substantially as specified.
In witness whereof, I, the said Sydney Pitt, have hereunto set my hand and
seal, this Seventeenth day of February, in the year of our Lord One
thousand eight hundred and eighty one.
CITTAITHI DIAM
חזת CIII
EY FITT
SYDNEY
DIDREI 1111.
(LLS.)