IMPROVE- MENTS IN BOWLS OR ROLLERS USED IN MACHINES FOR PRINTING FIBROUS MATERIALS
Year: 1858

page_text: LETTERS PATENT to John Macmillan Dunlop, of the City of Manchester,
in the County of Lancaster, Engineer, for the Invention of "IMPROVE-
MENTS IN BOWLS OR ROLLERS USED IN MACHINES FOR PRINTING FIBROUS
MATERIALS."
Sealed the 7th December 1858, and dated the 8th June 1858.
PROVISIONAL SPECIFICATION left by the said John Macmillan Dunlop
at the Office of the Commissioners of Patents, with his Petition, on the
8th June 1858.
I, JOHN MACMILLAN DUNLOP, of the City of Manchester, in the County of
Lancaster, Engineer, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN BOWLS OR ROLLERS USED IN MACHINES FOR PRINTING FIBROUS
MATERIALS," to be as follows:-
I cover the bowls or rollers with india-rubber or compound of india-rubber,
made either hard or elastic according to the purpose for which they may be
required. To make the said india-rubber coverings of straight and uniform
surface and density, I vulcanize them in moulds having the form required.

page_text: To keep the india-rubber from moving on or from the roller or bowl
which it covers, I vulcanize the rubber to the metal of which the roller is
composed.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said John Macmillan Dunlop in the Great Seal Patent Office on
the 8th December 1858.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
MACMILLAN DUNLOP, of the City of Manchester, in the County of Lancaster,
Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Eighth day of June, in the year of our Lord
One thousand eight hundred and fifty-eight, in the twenty-first year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said John Macmillan Dunlop, Her special licence that I, the said John
Macmillan Dunlop, my executors, administrators, and assigns, or such others
as I, the said John Macmillan Dunlop, my executors, administrators, and
assigns, should at any time agree with, and no others, from time to time
and at all times thereafter during the term therein expressed, should and
lawfully might make, use, exercise, and vend, within the United Kingdom of
Great Britain and Ireland, the Channel Islands, and Isle of Man, an Invention
for "IMPROVEMENTS IN BOWLS OR ROLLERS USED IN MACHINES FOR PRINTING
FIBROUS MATERIALS," upon the condition (amongst others) that I, the said
John Macmillan Dunlop, by an instrument in writing under my hand and
seal, should particularly describe and ascertain the nature of the said Invention,
and in what manner the same was to be performed, and cause the same to
be filed in the Great Seal Patent Office within six calendar months next and
immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said John Macmillan Dunlop, do hereby
declare the nature of my said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement (that is to say) :-
My said Invention consists in covering the bowls or rollers employed in
machines for printing fibrous materials with vulcanized india-rubber, or com-
pounds of vulcanized india-rubber, with other materials or substances made or

page_text: vulcanized either hard or clastic, according to the purpose for which they are
intended to be used. The said bowls or rollers are covered. with the said
materials or substances by placing them in moulds similar to those described in
the Patent granted to me and bearing date the Seventh day of June, in the
year of our Lord One thousand eight hundred and fifty-eight, No. 1280, for
"Improvements in Apparatus for Sizing Fibrous Materials."
To make the vulcanized india-rubber covers of a straight and uniform
surface and substance, I vulcanize them on the bowls or rollers they aro
intended to cover, or they may be vulcanized in moulds and on maundrils, and
afterwards taken off the maundrils and put on the bowls or rollers in the
manner described in the Patent dated the Seventh day of June, One thousand
eight hundred and fifty-eight, No. 1280, above alluded to. When it is
necessary to bave the vulcanized india-rubber elastic, and and at the same time
adhering firmly to the bowls or rollers, I cover the bowls or rollers with a
shell or cover of any suitable metal for which the vulcanized india-rubber has
an affinity, or I make them entirely of the metal; and for this purpose I find
by experience brass to be the best, as the elastic vulcanized india-rubber
adheres firmly to that metal both during and after the process of vulcanizing.
When the india-rubber is required to be hard, the bowls or rollers do not
require to be covered with brass or other metal, but are constructed same as
the hard rubber rollers described in the Patent of the Seventh day of June, Ono
thousand eight hundred and fifty-eight, already referred to. Whether the
bowls or rollers are covered with hard or clastic india-rubber, the surfaces are
afterwards to be turned or ground according to the processes or one of them
described in my said former Patent:
Having thus fully described the nature of my said Invention, and the
manner in which the same is to be performed, I desire it to be distinctly
understood that I do not confine myself to the precise details herein set forth,
as such may be varied or modified without departing from the principle
thereof; but I claim as my Invention, and which to the best of my knowledge
and belief has not been hitherto used within the realm,-
Firstly, the use or application of bowls or rollers used in machines for
printing fibrous materials covered with vulcanized india-rubber or any com-
pound thereof, with other materials or substances when the india-rubber is
applied as herein described.
And, secondly, the grinding or turning the surfaces of the said vulcanized
india-rubber covers after they are put on the bowls or rollers, as parts of
which improvements are herein described, and other parts described and

page_text: illustrated in the Specification of my previous Patent; dated the Seventh day
of Junc, One thousand eight hundred and fifty-eight, No:1280.
In witness whereof, I, the said John Macmillan Dunlop, have hereunto
set my hand and scal' this Seventh day of December, in the year of
our Lord One thousand eight hundred and fifty-eight!
Signed, sealed, and delivered by the
within-named "John Macmillan.
Dunlop, in the presence. of
JOHN M: DUNLOP. (L.S.)
E. J. Hoones, Patent Agent,
Manchester.