IMPROVE- MENTS IN MILLS FOR GRINDING CORN AND OTHER GRAIN
Year: 1861

page_text: LETTERS PATENT to Richard Archibald Brooman, of 166, Fleet Street,
in the City of London, Patent Agent, for the Invention of "IMPROVE-
MENTS IN MILLS FOR GRINDING CORN AND OTHER GRAIN."-A communication
from abroad by Joseph Perrigault, of Rennes, France.
Sealed the 16th October 1861, and dated the 20th April 1861.
PROVISIONAL SPECIFICATION left by the said Richard Archibald
Brooman at the Office of the Commissioners of Patents, with his Peti-
tion, on the 20th April 1861.
I, RICHARD ARCHIBALD BROOMAN, of 166, Fleet Street, in the City of
London, Patent Agent, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN MILLS FOR GRINDING CORN AND OTHER GRAIN," (communicated
to me from abroad by Joseph Perrigault, of Rennes, France,) to be as
follows:-
This Invention consists in means of ascertaining and regulating the intensity
of the current of air made to pass between the millstones in order to keep the
working surfaces cool, and in collecting the loose flour or mill-dust which
escapes, or is carried away with the air after passing between the stones. Air is
admitted through a tube which forms a continuation upwards of the eye of the
stone. This tube terminates on a level with the drum in which the stones are
enclosed. The flour and other material after being ground pass through a

page_text: shoot provided with a leather or other flap valve opening outwards only into
another shoot or pipe fitted with a similar valve. A passage leads from the
upper part of the drum, and communicates through a flexible tube with a similar
passage fitted with a slide valve or damper, and opening into a chamber which
itself opens into another chamber or passage, in the end of which a fan is
fitted. The outlet from the fan is into a box or chamber fitted with parti-
tions, in such manner as to cause the air and matters driven by the fan to
traverse the box in a zig-zag direction before issuing through a perforated
plate or other like filter; at the further end thereof a syphon tube, with liquid
in the bend or other gauge, is fitted to the upper part of the drum. The
chambers, passages, and boxes are formed with a jacket in order to their
being heated, should circumstances render heat necessary to prevent con-
densation on the inner surfaces thereof. Upon the fan being set in motion,
air will be drawn between the stones and up into the collecting chamber and
passages through the fan, and will be driven out through the box and filter
after having deposited the loose flour and mill dust in a dry state. The
gauge or syphon tube will indicate the force of the air to the miller, who can
regulate it to his requirements by means of the damper in the passage leading
to the collecting cliamber..
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Richard Archibald Brooman in the Great Seal Patent Office
on the 19th October 1861.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, RICHARD
ARCHIBALD BROOMAN, of 166, Fleet Street, in the City of London, Patent
Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date, the Twentieth day of April, in the year of our Lord One
thousand eight hundred and sixty-one, in the twenty-fourth year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto me, the said
Richard Archibald Brooman, Her special licence that I, the said Richard
Archibald Brooman, my executors, administrators, and assigns, or such others
as I; the said Richard Archibald Brooman, 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

page_text: Britain and Ireland, the Channel Islands, and Isle of Man, an Invention for
IMPROVEMENTS IN MILLS FOR GRINDING CORN AND OTHER GRAIN," (a communica-
tion from abroad by Joseph Perrigault, of Rennes, France,) upon the condition
(amongst others) that I, the said Richard Archibald Brooman, my executors 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 Great Seal Patent Office within six calendar
month next and immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Richard Archibald Brooman, 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, reference being had to the Drawings hereunto annexed,
that is to say-
This Invention consists in means of ascertaining and regulating the intensity
of the current of air made to pass between the millstones in order to keep
the working surfaces cool, and in collecting the loose flour or mill dust which
escapes or is carried away with the air after passing between the stones.
Air is admitted through a tube which forms a continuation upwards of the
eye of the stone. This tube terminates on a level with the drum in which.
the stones are enclosed. The flour and other material after being ground pass
through a shoot provided with a leather or other flap valve opening outwards
only into another shoot or pipe fitted with a similar valve, or into a receiver.
A passage leads from the upper part of the drum, and communicates through
a flexible tube with a similar passage fitted with a slide valve or damper, and
opening into a chamber which itself opens into another chamber or passage,. in
the end of which a fan is fitted; the outlet from the fan is into a box or chamber.
fitted with partitions in such manner as to cause the air and matters driven
by the fan to traverse the box in a zig-zag direction before issuing directly
into a pipe leading to the outside of the mill, or through a perforated plate
or other like filter at the further end thereof. A syphon tube with liquid in
the bend or other gauge is fitted to the upper part of the drum. The
chambers, passages, and boxes are formed with a jacket in order to their
being heated, should circumstances render heat necessary to prevent conden-
sation on the inner surfaces thereof.
Figure 1. of the accompanying. Drawings is a longitudinal section, and
Figure 2 a horizontal. section, of so much of a mill for grinding corn and
other grain, shewing two sets of stones arranged. round a. central chamber as

page_text: will be necessary to illustrate the manner in which the Invention is carried into
effect. Instead of the stones being arranged as shewn, they may be set up
in a row or otherwise, every pair being made to communicate with the pas-
sage i, hereafter mentioned. a, a, are tubes above the millstones b, b, and on
a level with the drums c, c, in which they are enclosed; d, d, are rings of
caoutchouc or other flexible material, fixed to the upper surface of the
drums c, c, and on the upper edge of the tubes a, a; the hole in the rings is
somewhat smaller than that of the tubes a, a, so that the edges of the
tubes are quite covered; e, e, are passages leading from the drums to the
chamber f; g, g, are caoutchouc or other flexible connections, whereby the
passage e is connected with the passage e'; h is a valve fitted in the passage e¹,
whereby the current of air is regulated. The chamber f has an opening
formed in it, by which the loose flour falling therein is periodically removed;
i is a passage above the chamber f, having a fan or blower at its further
end; is a box or case above the fan containing partitions m, m, fitted alter-
nately to the ends of the case so that the air, loose flour, and mill dust driven
through the case take a zig-zag course as shown by the arrows, the flour
being intercepted by and deposited on the partitions; n is an opening at the
end of the case 1, leading into the conduit y. One end of the box is made to
slide out, taking with it so many of the partitions as are attached to it for the
purpose of collecting the flour deposited upon those partitions; the flour
deposited within the box is removed by brush or otherwise; o, o, are caoutchouc,
leather, or other valves fitted to the pipes or passages leading the ground
material away from the stones; p, p, are the syphon gauge tubes filled with
liquid in the bend, and fitted into the upper part of the drum.
lecting chamber f, passage i, and box 7, are surrounded with a jacket or
double case, through which steam or heated air may be driven either directly
or through a pipe or pipes placed in the jacket.
The col-
Upon the fan being set in motion, air will be drawn between the stones
and up into the collecting chamber and passages through the fan taking with
.it loose flour and mill dust, and will be driven out through the box after
having deposited the loose flour and mill dust in a dry state. The gauge or
syphon tube will indicate the force of the air to the, miller who can regulate
it to his requirements by means of the damper in the passage leading to the
collecting chamber.
And having now described the nature of the said Invention, and in what
manner the same is to be performed, I declare that I claim as the improve-
ments in mills for grinding corn and other grain,-

page_text: First, surrounding or forming the collecting chamber f, passage i, and box
with a jacket or double case as herein-before described.
And, second, forming the box through which the air, and loose flour, and
mill dust are driven, with partitions upon which the flour becomes deposited,
as herein-before described.
In witness whereof, I, the said Richard Archibald Brooman, have
hereunto set my hand and seal, this Nineteenth day of October, One
thousand eight hundred and sixty-one.
R. A. BROOMAN. (L.s.)