IMPROVEMENTS IN CENTRIFUGAL DRYING MACHINES
Year: 1869

page_text: LETTERS PATENT to William Bancroft Espeut, of No. 14, Southwick
Street, Hyde Park, in the County of Middlesex, for the Invention
of "IMPROVEMENTS IN CENTRIFUGAL DRYING MACHINES"
Sealed the 1st March 1870, and dated the 30th October 1869.
PROVISIONAL SPECIFICATION left by the said William Bancroft
Espeut at the Office of the Commissioners of Patents, with his
Petition, on the 30th October 1869.
I, WILLIAM BANCROFT ESPEUT, of No. 14, Southwick Street, Hyde
Park, in the County of Middlesex, do hereby declare the nature of the
said Invention for "IMPROVEMENTS IN CENTRIFUGAL DRYING MACHINES," to
be as follows :-
Heretofore the sides of the revolving drum of centrifugal drying
machines have usually been made with seiveing wire supported by
perforated sheet copper, and this has been supported by numerous rods
or stays fastened around the periphery of the revolving drum.

page_text: My Invention consists in employing, in lieu of the perforated sheet
and rods or stays, a drum formed of a shell of perforated copper, with
corrugations running spirally around the drum, or the corrugations may
be horizontal. Between the sifting wire and the outer corrugated casing
I place a layer of coarser meshed wire.
Secondly. In lieu of the brake at present used for acting against one
or more points of the circumference of the top of the drum in order to
stop the drum revolving, I employ a circular brake of equal size with
the upper surface of the drum, and so obviate placing any unequal strain
upon the drum or upon its spindle at the time of applying the brake.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Bancroft Espeut in the Great Seal Patent
Office on the 29th April 1870.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
BANCROFT ESPEUT, of No. 14, Southwick Street, Hyde Park, in the
County of Middlesex, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Thirtieth day of October, in the year
of our Lord One thousand eight hundred and sixty-nine, in the thirty-
third year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said William Bancroft Espeut, Ier special
Licence that I, the said William Bancroft Espeut, my executors, adminis-
trators, and assigns, or such others as I, the said William Bancroft
Espeut, 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 CENTRIFUGAL DRYING MACHINES," upon the condition
(amongst others) that I, the said William Bancroft Espeut, my exe-
cutors or administrators, by an instrument in writing under my, or
their, or one of their hands and seals, 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

page_text: Great Seal Patent Office within six calendar months next and imme-
diately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said William Bancroft Espeut, do hereby
declare the nature of the said Invention, and in what manner the samo
is to be performed, to be particularly described and ascertained in and
by the following statement thereof, that is to say:-
Heretofore the sides of the revolving drum of centrifugal drying
machines have usually been made with the sieveing wire supported by
perforated sheet copper, and this has been supported by numerous rods
or stays fastened around the periphery of the revolving drum.
My Invention consists in employing, in lieu of the perforated sheet
and rods or stays, a drum formed of a sheet of perforated copper or other
metal, with corrugations running spirally around the drum, or the
corrugations may be horizontal. Between the sifting wire and the outer
corrugated casing I place a layer of coarse meshed wire.
Having thus described the nature of my Invention, I will proceed to
describe more fully the manner of performing the same.
DESCRIPTION OF THE DRAWINGS.
Figure 1 shews a vertical section, and Figure 2 a horizontal section of
a centrifugal drying machine constructed according to my Invontion.
a is the outer cylindrical casing of corrugated and perforated sheet
metal. The corrugations, as before stated, may run cither horizontally
or spirally around the drum. The cylinder is made up of corrugated
plates of metal bent to form and rivetted firmly to one another. The
corrugated cylinder is at its bottom rivetted firmly to the bottom plate b,
and at its top to the top plate c. d is a lining of coarse meshed wire or
perforated plate resting against the interior of the cylinder a; e is the
cylinder of sieveing wire.
By this construction a drum of great strength is obtained, whilst at
the same time the perforations in the plate a allow of a free escape of
any liquid which filters through the sieveing wire e; fis a break wheel
fixed to the bottom plate 6 for a break strap to pass around, as is usual.
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 constructing the revolving cylinder of centrifugal drying machines,

page_text: substantially as herein described, with an outer casing of perforated and
corrugated sheet metal.
In witness whereof, I, the said William Bancroft Espeut, have
hereunto set my hand and scal, this Eighth day of March, in
the year of our Lord One thousand eight hundred and seventy.
WILLIAM BANCROFT ESPEUT. (L.s.)