IMPROVEMENTS. IN CENTRI- FUGAL MACHINES
Year: 1874

page_text: LETTERS PATENT to William Shears, of No. 27, Bankside, in the
County of Surrey, for the Invention of "IMPROVEMENTS. IN CENTRI-
FUGAL MACHINES."
T
Scaled the 6th April 1875, and dated the 30th October 1874.
PROVISIONAL SPECIFICATION left by the said William Shears
at the Office of the Commissioners of Patents, with his Petition,
on the 30th October 1874.
I, WILLIAM SHEARS, of No. 27, Bankside, in the County of Surrey,
do hereby declare the nature of the said Invention for "IMPROVEMENTS
IN CENTRIFUGAL MACHINES," to be as follows:-
This Invention has for its object improvements in centrifugal
machines.
I form the revolving drums of centrifugal machines with the internal
or sieve surface of finely perforated and corrugated material or perforated
material formed with panels or indentations supported externally by a
plain cylinder or drum with comparatively large holes in it, so that any
thing which passes through the sieve surface may readily escape. Only
a very small part of the corrugated or indented sieve surface being in
contact with the external supporting cylinder or drum the passage of

page_text: liquid through the sieve surface is scarcely impeded by the external
support. Or in some cases I make the external supporting cylinder or
drum with a series of recessed panels occupying the greater part of the
internal surface of the cylinder. The internal sieve surface rests upon
the ridges left between the recessed panels of the supporting cylinder.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Shears in the Great Seal Patent Office
on the 30th April 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
SHEARS, of No. 27, Bankside, in the County of Surrey, 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 seventy-four, in tho
thirty-eighth year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said William Shears, Her special
license that I, the said William Shears, my executors, administrators,
and assigns, or such others as I, the said William Shears, 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 MACHINES," upon the condition (amongst others) that I,
the said William Shears, my executors or administrators, by an instru-
ment 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 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 William Shears, do hereby declare
the nature of the said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the
following statement thereof, that is to say :-
-
This Invention has for its object improvements in centrifugal

page_text: I form the revolving drums of centrifugal machines with the internal
or sieve surface of finely perforated and corrugated material supported
externally by a plain cylinder or drum with comparatively large holes
in it, so that anything which passes through the sieve surface may
readily escape. Only a very small part of the corrugated sieve surface
being in contact with the external supporting cylinder or drum the
passage of liquid through the sieve surface is scarcely impeded by the
external support.
In the Drawing hereunto annexed I have shown a revolving drum
constructed as above described.
Figure 1 is a vertical section of the drum, and Figure 2 a plan view.
The drum is as heretofore made with a horizontal bottom A and
central conc B to fit over the revolving cone, by which it is to be
driven; C is a plain cylinder or drum fixed to the outer circumference
of the bottom A, and having comparatively large holes formed through
it; D is the inner lining of finely perforated material, corrugated as
shown, or in place of the corrugations being of a curved form angular
corrugations might be adopted.
Where the ends of the corrugated plate which forms the lining meet
one another they may be soldered or otherwise connected together.
Having thus described the nature of my Invention and the manner
of performing the same, I would have it understood that I claim, the
construction of the revolving drums of centrifugal machines with the
internal or sieve surface of fincly perforated and corrugated material
and supported externally by a plain cylindor or drum with comparatively
large perforations in it, substantially as herein described.
In witness whereof, I, the said William Shears, have hereunto
set my hand and seal, this Thirtieth day of April, in the year of
our Lord One thousand eight hundred and seventy-five.