AN IMPROVED APPARATUS FOR OBTAINING EXTRACTS OR DECOCTIONS SPECIALLY APPLICABLE FOR MAKING Beef Tea
Year: 1879

page_text: LETTERS PATENT to Thomas George Fonnereau Dolby, of Dulwich, in the
County of Surrey, Manufacturer, for the Invention of "AN IMPROVED
APPARATUS FOR OBTAINING EXTRACTS OR DECOCTIONS SPECIALLY APPLICABLE
FOR MAKING Beef Tea.”
Sealed the 9th April 1880, and dated the 13th October 1879.
PROVISIONAL SPECIFICATION left by the said Thomas George Fonnereau
Dolby at the Office of the Commissioners of Patents on the 13th October
1879.
THOMAS GEORGE FONNEREAU DOLBY, of Dulwich, in the County of Surrey,
Manufacturer. "AN IMPROVED APPARATUS FOR OBTAINING EXTRACTS OR DECOCTIONS,
SPECIALLY APPICABLE FOR MAKING BEEF TEA."
In obtaining extracts or decoctions, and more particularly in obtaining au extract
of beef, commonly called beef tea, it is important that the temperature within the
vessel containing the substance from which the extract is to be obtained, say beef,
should never reach boiling point, but should remain as nearly as possible at a
temperature of about 160° to 180° Fahrenheit. In the ordinary ways of making
beef tea, whether in a jar placed in an oven to stew, or in a saucepan placed on a
fire to simmer, it is difficult to prevent the temperature getting too high, and
therefore the extract obtained is deficient both in quality and quantity.
Now by means of my apparatus I am enabled to prevent the temperature within
the vessel exceeding about 160° to 180°, or at least for a sufficient length of time
to make the beef tea. My apparatus consists of a jacketed or double vessel for
containing the beef and the usual amount of water; it is made by preference in two
parts, that is to say, the outer vessel which has an inner flange at the top, and the
inner vessel which has an outer flange by which it is suspended upon the flange of
the outer vessel so as to leave a sufficient space between their respective bottoms;
the jacket or space between the two portions of the vessel is left empty, except
that it contains air. The outer vessel should be made of thin metal which is a good
conductor of heat, such as tin plate or copper. The vessel is fitted with a cover, by
preference a screw cover, which may likewise be jacketed or double, and the vessel
has feet to keep its bottom from contact with the bottom of any pot or vessel in
which it may be placed.
In order to make beef tea the jacketed vessel containing the beef and water, and
with the cover thereon, is placed in a pot or vessel containing water; this pot is
then placed on a fire or otherwise so as to boil the water therein. The air in the
jacket will act as a conductor of the heat sufficiently to allow the temperature
within the inner vessel to reach but not exceed 180° during the time required for
making beef tea.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Thomas George Fonnereau Dolby in the Great Seal Patent Office
on the 10th April 1880.
THOMAS GEORGE FONNEREAU DOLBY, of Dulwich, in the County of Surrey,
Manufacturer. "AN IMPROVED APPARATUS FOR OBTAINING EXTRACTS OR DECOCTIONS,
SPECIALLY APPLICABLE FOR MAKING BEEF TEA."
In obtaining extracts or decoctions, and more particularly in obtaining an extract
of beef, commonly called beef tea, it is important that the temperature within the
vessel containing the substance from which the extract is to be obtained, say beef,
should never exceed 180° Fahrenheit. In the ordinary ways of making beef tea,
whether in a jar placed in an oven to stew, or in a saucepan placed on a fire to
simmer, it is difficult to prevent the temperature getting too high, and therefore the
extract obtained is deficient both in quality and quantity.
Now by means of my apparatus I am enabled to prevent the temperature within
the vessel exceeding 180°, or at least for a sufficient length of time to make the
beef tea. My apparatus consists of a jacketed or double vessel for containing the
beef and the usual amount of water; it is made by preference in two parts, that is to
say, the outer vessel which has an inner flange at the top, and the inner vessel
which has an outer flange by which it is suspended upon the flange of the outer
vessel so as to leave a sufficient space between their respective bottoms; the jacket
or space between the two portions of the vessel is left empty, except that it contains
air. The outer vessel should be made of thin metal which is a good conductor of
heat, such as tin plate or copper. The vessel is fitted with a cover, by preference a
screw cover, which may likewise be jacketed or double, and the vessel has feet to
keep its bottom from contact with the bottom of any pot or vessel in which it may
be placed.
In order to make beef tea the jacketed vessel containing the beef and water, and
with the cover thereon, is placed in a pot or vessel containing water; this pot is
then placed on the fire or otherwise so as to boil the water therein. The air in the
jacket will act as a conductor of the heat sufficiently to allow the temperature
within the inner vessel to reach but not exceed 180° during the time required for
making beef tea.
The manner in which I prefer to construct my apparatus is represented in vertical
section in the accompanying Drawing. a is the outer vessel which forms the jacket,
and b the inner vessel. The outer vessel a has an inner flange c near the top, and
the inner vessel b has a corresponding outer flange d by which it is suspended upon
the flange c so as to leave a sufficient space between their respective bottoms. If
however the inner vessel be made of earthenware, it may rest upon the bottom of
the outer vessel, but I always prefer to have a space of from '% to 1% of an inch
between the two bottoms. e is a screw cover to the apparatus taking into a
corresponding female screw at the upper part of the vessel a; this cover may or may
not be closed at the bottom e¹. fff, are feet to the outer vessel to keep its bottom
from contact with the bottom of any pot or vessel in which it may be placed: g is
a handle to the outer vessel, and h a handle to the inner vessel.
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 improved apparatus for making beef tea or obtaining other extracts or

page_text: decoctions, constructed substantially as hereinbefore described and represented in
the accompanying Drawing.
In witness whereof, I, the said Thomas George Fonnereau Dolby, have
hereunto set my hand and seal, this Tenth day of April, One thousand eight
hundred and eighty.
T. G. F. DOLBY. (L.S.)