AN IMPROVED FALSE BOTTOM FOR MASH TUNS, HOP BACKS, OR OTHER VESSELS FOR THE PURPOSE OF DRAINAGE
Year: 1881

page_text: LETTERS PATENT to George Gordon Cave, of Castle Green, in the City and
County of Bristol, Brewer, for an Invention of "AN IMPROVED FALSE
BOTTOM FOR MASH TUNS, HOP BACKS, OR OTHER VESSELS FOR THE
PURPOSE OF DRAINAGE."
PROVISIONAL SPECIFICATION left by the said George Gordon Cave at
the Office of the Commissioners of Patents on the 11th October 1881.
GEORGE GORDON CAVE, of Castle Green, in the City and County of Bristol,
Brewer. "AN IMPROVED FALSE BOTTOM FOR MASH TUNS, HOP BACKS, OR
OTHER VESSELS FOR THE PURPOSE OF DRAINAGE."
This Invention which relates to an improved false bottom for mash tuns, hop
backs, or other vessels for the purpose of drainage consists of a cast iron plate
having taper holes cast or drilled on one side, and countersunk holes on the other
side. In these holes copper cylinders closed at one end and perforated with a
number of fine holes and flanged at the other end are inserted. These cylinders
are secured in the holes by being swelled after insertion in the cast iron plate by
the aid of a centre punch or other equivalent means.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said George Gordon Cave in the Great Seal Patent Office on the 6th April
1882.
GEORGE GORDON CAVE, of Castle Green, in the City and County of Bristol,
Brewer. "AN IMPROVED FALSE BOTTOM FOR MASH TUNS, HOP BACKS, OR
OTHER VESSELS FOR THE PURPOSE OF DRAINAGE,”
My said Invention which relates to an improved false bottom for mash tuns, hop
backs, or other vessels for the purpose of drainage consists of a plate of cast iron or
other suitable metal or material having holes cast or drilled therein, which holes on
one side are taper or otherwise suitably shaped, and countersunk on the opposite
side. In these holes cylinders or caps of copper or other suitable metal or material
closed at one end with a head perforated with a number of fine holes and open at
the other end are inserted. These cylinders or caps when of metal may be secured
in the holes by being swelled after insertion in the plate by the aid of a centre
punch, the cylinders or caps when of china or other inelastic material being
secured in the said holes by other suitable or equivalent means, such as by cement
or hemp packing.
And in order that my said Invention may be properly understood I now
proceed more particularly to set forth the system, mode, or manner in or under
which the same is or may be used or practically carried into effect, reference being
had to the accompanying Drawings and to the letters and figures marked thereon,
that is to say:-
Figure 1 represents a sectional elevation of a portion of a cast iron plate with
some of the copper cylinders or caps inserted therein; Figure 2 is a plan of the
same Figure 3 drawn to a smaller scale represents a plan of one of the segmental
plates of a perforated false bottom, shewing the arrangement of a number of the
cylinders or caps inserted within the perforations of the same. As shewn more
particularly in Figure 1, the plate B of the false bottom is formed with holes
therein. At one side of the plate each such hole is formed with a countersunk b,
and at the other side with a recess b² to receive a flange on the cylinder or cap.
The cylinders or caps A are formed of a corresponding shape, and are inserted
within the said holes or perforations through the plate, the upper ends of the said
caps being closed with heads a perforated with a number of fine holes a¹, and when
placed in situ with the flanges 63 resting within the recesses b¹, each such cap is
expanded into the countersunk part of the hole by applying a centre-punch or
equivalent expanding instrument. In lieu of constructing the caps of copper they
may be formed of any other suitable metal or material; the plates of the perforated
false bottom also may be constructed of other metal or material than cast iron.
For example, in applying my Invention to draining in slate tanks and earthenware
tanks for acid baths, the cylinders or caps may be formed of glass, china, porcelain,
or other suitable material, and in lieu of inserting the said caps within the plate or
plates of the false bottom in the manner shewn in the accompanying Drawings, the
caps may be provided with cement, asbestos, hemp, or other packing, in order to
secure them within the holes of the said plate, or both.
Having now described and particularly ascertained the nature of my said
Invention, and the system, mode, or manner in or under which the same is or
may be used or practically carried into effect, I would observe in conclusion that
I do not limit myself to the precise application of my said Invention as herein
described, as my said Invention is applicable to a variety of purposes where
draining is required to be effected through fine perforations, but what I consider to

page_text: be novel and original, and therefore claim as the Invention secured to me by the
hereinbefore in part recited Letters Patent is,—
The improved false bottom for mash tuns, hop backs, or other vessels for the
purpose of drainage, constructed of plates in the perforations of which caps or
cylinders having fine holes therein are fitted, substantially as hereinbefore
described.
In witness whereof, I, the said George Gordon Cave, have hereunto set my
hand and seal, this Fourth day of April, in the year of our Lord One
thousand eight hundred and eighty two.