Improved Appliance for Aërating Brewers' Yeast and Mixing the same with Wort and other Ingredients.
Year: 1890

page_text: Date of Application, 22nd Apr.. 1890
Complete Specification Left, 19th Feb., 1891-Accepted, 21st Mar., 1891
PROVISIONAL SPECIFICATION.
Improved Appliance for Aërating Brewers' Yeast and Mixing the
same with Wort and other Ingredients.
I, FREDERICK MACFIE MAYNARD, of 12, Hamilton Terrace, Southampton West,
in the County of Hants, Brewer, do hereby declare the nature of this invention to
be as follows:-
This invention consists in an improved appliance for aerating brewers' yeast
prior to use in the fermenting tun, and for mixing the yeast with wort and any yeast
foods which it may be desired to use. The appliance consists of a cylindrical or
conical vessel set vertically and surrounding a tubular open-ended vessel concentric
with the outer vessel. The outer vessel is open at the top only. Near the upper
end of the internal vessel is a perforated tray which fits the vessel internally.
A. space intervenes between the two vessels.
Set vertically and centrally in the internal vessel, which does not extend to the
bottom of the outer vessel, is a spindle fitted towards the bottom with blades
arranged after the manner of a screw propellor.
When the appliance has been charged, the spindle is rotated, either by hand or
mechanically, and by the blades of the agitator rotating with the spindle the con-
tents of the vessel are stirred and mixed and are impelled upwards in the space
between the vessels and flowing over the top of the internal vessel are again received
therein. Thus a constant circulation is maintained while the agitator is in opera-
tion. The mixture passing through the perforations in the tray descends after
the manner of rain and thus becomes aërated. The outer vessel is fitted at bottom
with a cock for drawing off the contents after aëration and admixture.
When filtered or pure air is used for acration the outer vessel is closed at top and
the pure air forced into the appliance by a fan or other device or means.
Dated this 19th day of April 1890.
NICHOLAS WATTS,
Bristol Bank Buildings, Bristol, Agent.
COMPLETE SPECIFICATION.
Improved Appliance for Aërating Brewers Yeast and Mixing the
same with Wort and other Ingredients.
1. FREDERICK MACFIE MAYNARD, of 12, Hamilton Terrace, Southampton
West, in the County of Hants, Brewer, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :-
This invention consists in an improved appliance for aërating brewers' yeast prior
to use in the fermenting tun, and for mixing the yeast with wort and any yeast foods
which it may be desired to use. The appliance consists of a cylindrical or conical
vessel set vertically and surrounding a tubular open-ended vessel concentric with the
outer vessel. The outer vessel is open at the top only and is preferably enveloped
by a jacket of, warm water or steam. Near the upper end of the internal vessel
s a perforated tray which fits the vessel internally. A space intervenes between
the two vessels.
Set vertically and centrally in the internal vessel, which does not extend to the

page_text: bottom of the outer vessel, is a spindle fitted towards the bottom with blades
arranged after the manner of a screw propellor.
When the appliance has been charged, the spindle is rotated, either by hand or
mechanically, and, by the blades of the agitator rotating with the spindle, the
contents of the vessel are stirred and mixed and are impelled upwards in the space
between the vessels, and, flowing over the top of the internal vessel, are again
received therein. Thus a constant circulation is maintained while the agitator is in
operation.
The mixture passing through the perforations in the tray descends after the
manner of rain and thus becomes aërated. The outer vessel is fitted at bottom
with a cock for drawing off the contents after aëration and admixture. When
filtered or pure air is used for aeration the outer vessel is closed at top and the pure
air forced into the appliance by a fan or other device or means.
In the accompanying drawings,
Fig. 1 represents a vertical section and Fig. 2 a plan of my improved appliance
for aërating brewers' yeast and for mixing the same with wort and with any yeast,
food or foods.
The appliance consists of a copper vessel a, preferably surrounded by a shell a'
between which and the vessel a is a space designed to contain warm water or steam.
The vessel is open at the upper end and closed at the lower.
Within the vessel a and concentric therewith is an open-ended tubular central
copper vessel b supported on legs b¹.
Towards the upper end of the vessel and fitting the same internally is a
perforated tray c. Extending vertically in the two vessels is a spindle d carried in
bearings e and furnished near the lower end with blades. The spindle dis arranged
to be revolved through bevel gearing g which may be driven either mechanically or
by hand. Part of the gearing and other driving parts and fittings therefor are
carried on a bracket h which is conveniently secured to the outer vessel a by clamping
screws, a method of attachment which admits of ready unshipment of the bracket
and withdrawal of the spindle when required.
The yeast to be aërated is, together with the wort and such yeast foods as are to
be mixed therewith, charged into the outer vessel a. The spindle with the
agitator is then rotated.
C
The contents of the appliance are thus stirred and mixed and are impelled
upwards in the space between the vessels a and b. They overflow from the outside
the upper edge of the vessel and are received into that vessel and passing through
the perforations in the tray they descend below it in the form of rain and become
effectually aërated. Thus while the agitator fis kept in motion a constant circula-
tion of the contents of the appliance is maintained. By the provision of the water
or steam jacket surrounding the outer vessel a the temperature of the yeast and
wort is raised and the activity and growth of the yeast accelerated. Towards the
bottom the vessel a is fitted with a cock k whereat the contents when sufficiently
acrated and mixed are drawn off.
Instead of being conical, as illustrated in the drawings, the vessels a and b may
be cylindrical.
When aëration is to be effected with filtered air, the vessel a is closed at top and
the filtered air is forced into the appliance under pressure.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is-
An appliance for aërating brewers' yeast and for mixing the same with wort and
with yeast foods, consisting of a copper vessel such as a, preferably jacketted,
surrounding and concentric with an open-ended copper vessel such as fitted towards
the upper end with a perforated tray such as c, and a spindle vertically disposed in
the axis of the said vessels and fitted with blades f, or the equivalent thereof, the

page_text: said spindle being arranged for revolution, either mechanically or manually, sub-
stantially as hereinbefore described and for the purposes specified.
Dated this 18th day of February 1891
NICHOLAS WATTS,
Bristol Bank Buildings, Bristol, Agent.