AN IMPROVED AIR FILTER FOR BEER PUMPS
Year: 1877

page_text: LETTERS PATENT to Johann Carl Adolph Rohde, Engineer, in the City of
Hamburg, Germany, for the Invention of "AN IMPROVED AIR FILTER FOR
BEER PUMPS."
Sealed the 26th February 1878, and dated the 3rd September 1877.
PROVISIONAL SPECIFICATION left by the said Johann Carl Adolph Rohde
at the Office of the Commissioners of Patents on the 3rd September 1877.
JOHANN CARL ADOLPH ROHDE, Engineer, in the City of Hamburg, Germany.
"AN IMPROVED AIR FILTER FOR BEER PUMPS."
The purpose of this Invention is to purify the air before it is pumped into the
barrels of beer, or into tanks in connection with barrels of beer. By this means
beer is prevented being spoiled by impure air as is now the case.
The apparatus or air filter consists of two cast-iron vessels enamelled on the inside
and secured together by screws. To the top of the upper vessel a ball-shaped vessel
or reservoir of sheet metal is connected by a pipe. This ball is perforated at its
upper surface for the entrance of the air, and is partly filled with cotton impregnated
with salicylic acid, through which the impure air must pass, and be cleaned from
larger mechanical impurities. The air passes then through a pipe, which reaches
nearly down to the bottom of the lower vessel, and passes through a block of
charcoal and potassa permanganate, and is afterwards again filtrated within the
upper vessel through layers of pulverized charcoal.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Johann Carl Adolph Rohde in the Great Seal Patent Office on the
2nd March 1878.
JOHANN CARL ADOLPH ROHDE, Engineer, in the City of Hamburg, Germany.
"AN IMPROVED AIR FILTER FOR BEER PUMPS."
The purpose of this Invention is to purify the air before it is pumped into beer
barrels, or tanks in connection with beer barrels.
The air of cellars or warehouses in which beer is stored is generally of a very bad
quality, but the application of this apparatus prevents the beer being spoiled thereby,
as the air brought in connection with the apparatus is thoroughly purified by the
action of the filter.
The apparatus consists of two cast iron and inside enamelled vessels secured
together by screws. To the top of the upper vessel a ball shaped vessel of sheet
metal is attached by a pipe. This ball may be perforated on its upper surface for
the entrance of air when a suction pump is in connection with the apparatus; or it
may be closed and connected to a pressure air pump by ineans of a pipe. The ball
is partly filled with cotton impregnated with acid salicyl, through which the impure
air must pass, thereby becoming cleaned from mechanical impurities mainly. The
air then passes through a pipe that reaches down nearly to the bottom of the lower
vessel through a block of charcoal and through potassa, permanganas, with which
the lower vessel is filled. Then the air moves again upward through the top vessel,
and within this vessel it is further filtered through layers of pulverized charcoal, and
through a block of charcoal.
In the accompanying Sheet of Drawings my apparatus is shown in one quarter of
full size, and as arranged when in connection with a pressure pump.
Figure 1 is an elevation; Figure 2, a section; and Figure 3, a ground-plan of the
same.
A is the upper, and B the lower vessel, secured together by screws; C is the ball
shaped top vessel; and a, the inlet pipe for the air coming from the pressure pump.
Within the ball the cotton impregnated with acid salicyl is placed, the air is forced
through it, then passes down through pipe d and through a block of charcoal E. The
bottom vessel is partly filled with potassa permanganas, which the air is forced to
pass through; e, c, e, are strainer or perforated metallic plates, between which
layers of pulverised charcoal 8, 8, 8, and a compact block of charcoal are placed,
through which the nir passes; R is the outlet pipe for the purified air, from which
it is led to the beer barrels or the tanks connected therewith.
And having now described the nature of my said Invention, and in what manner
the same is to be performed, I declare that I claim the herein-before described system
of filtering air for beer pumps and apparatus connected therewith, as set forth and
substantially as shown in the Drawings.
In witness whereof, I, the said Johann Carl Adolph Rohde, have hereunto
set my hand and seal, this Twenty-fifth day of February, One thousand
eight hundred and seventy-eight.
JOHANN CARL ADOLPH ROHDE. (LS.)