IMPROVEMENTS IN APPARATUS FOR EVAPORATING CANE JUICE AND OTHER LIQUIDS
Year: 1874

page_text: LETTERS PATENT to William Bancroft Espeut, of No. 14, Southwick
Street, Hyde Park, in the County of Middlesex, for the Invention
of "IMPROVEMENTS IN APPARATUS FOR EVAPORATING CANE JUICE AND OTHER
LIQUIDS."
Sealed the 29th December 1874, and dated the 15th August 1874.
PROVISIONAL SPECIFICATION left by the said William Bancroft
Espeut at the Office of the Commissioners of Patents, with his
Petition, on the 15th August 1874.
I, WILLIAM BANCROFT ESPEUT, of No. 14, Southwick Street, Hyde
5 Park, in the County of Middlesex, do hereby declare the nature of the
said Invention for "IMPROVEMENTS IN APPARATUS FOR EVAPORATING CANE JUICE
AND OTHER LIQUIDS," to be as follows:-
This Invention has for its object improvements in apparatus for
evaporating cane juice and other liquids. For this purpose I employ a

page_text: metal case by preference of rectangular form. By means of a pump or
fan a partial vacuum is maintained in the case. Within the case are a
series of trays one over the other. The juice (or other liquor) is carried
by a pipe to one end of the uppermost tray, and the tray being slightly
inclined it runs to the other end ridges upon the tray, compelling it to
take a zig-zag course.
From the end of the uppermost tray the juice
falls on to the next tray, which is inclined in the opposite direction.
This tray and those beneath it are similar to the first, so that the juice
falls from tray to tray, and flows to and fro from end to end of the case
in addition to passing, as already mentioned, in a zig-zag course from
side to side of each tray as it flows over it.
The trays fit close to the side of the sides of the case, leaving only a
space at one end, where the juice falls to the tray below from the bottom
of the case. The juice is led away by a pipe to other apparatus. A
pipe admits a current of heated air beneath the lowest tray; the air
passes along bencath it to the other end of the casing, then rises by the
passage, which allows the liquor to descend, and so it passes beneath
cach tray in successsion until it reaches an outlet at the top of the casing
in connection with the pump or fan by which the exhaust is maintained.
A stop-cock is provided, by which the amount of hot air admitted
beneath the lowest tray can be regulated, and there is also beneath cach
tray a cock by which cold air can be admitted at pleasure for the purpose
of reducing the temperature; but in order that the temperature through-
out the apparatus may be more under control all the heated air required
is not admissable only at the bottom, but also immediately beneath cach
of the other trays of the series by other pipes provided with cocks for
the purpose.
A thermometer is fitted in each of the spaces into which
the trays divide the interior of the casing.
The action of the apparatus is continuous, the liquor passing in at the
top and flowing out in a concentrated state at the bottom. The concen-
trated juice from this apparatus is passed into a pan heated by pipes within
it. Over the pan a drum is mounted, which dips at the bottom into the
liquor in the pan, and as it revolves it carries up a film of the liquid on
its surface. The periphery of the drum is corrugated, the corrugations
passing around it.
The hot and moist air which is drawn out of the case of the apparatus
lusad lonovilad in fa
11
قيف

page_text: coils of pipes (both or either according to the stage at which the concen-
tration has arrived), and so the heat which this air carries with it from
the preliminary evaporation is utilized in completing the concentration;
but should this not be found sufficient hot air can be added to or substi-
tuted for the air coming from the evaporator, thus enabling the use of
the concentrating vessel at such times that the evaporator is unused.