IMPROVEMENTS IN THE MANUFACTURE OF SUGAR
Year: 1880

page_text: LETTERS PATENT to John MoLaren, of Leeds, in the County of York,
Engineer, for an Invention of "IMPROVEMENTS IN THE MANUFACTURE OF
SUGAR." A communication from abroad by Alexander Richard Mackenzie, of
Mackay, in the Colony of Queensland, Australia.
PROVISIONAL SPECIFICATION left by the said John MoLaren at the Office
of the Commissioners of Patents on the 15th April 1880.
IMPROVEMENTS IN
JOHN MCLAREN, of Leeds, in the County of York, Engineer.
THE MANUFACTURE OF SUGAR." [A communication from abroad by Alexander
Richard Mackenzie, of Mackay, in the Colony of Queensland, Australia.]
This Invention relates to that portion of the process employed in the manufacture
of sugar, which consists in operating upon the syrup in the vacuum pan, and it
consists chiefly in the employment of an ejector for producing the required vacuum.
The steam froin the ejector may be utilized in heating the coils of the pan. It is
also proposed to make the vacuum pan of a corrugated shape, so as to secure
increased strength and rigidity.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John McLaren in the Great Seal Patent Office on the 15th October
1880.
JOHN MOLAREN, of Leeds, in the County of York, Engineer.
"IMPROVEMENTS IN
THE MANUFACTURE of Sugar." A communication from abroad by Alexander
Richard Mackenzie, of Mackay, in the Colony of Queensland, Australia.
The said Invention relates to that portion of the process employed in the
manufacture of sugar, which consists in operating upon the syrup in the vacuum
pan, and it has reference to the employment in the manner hereinafter described
of an ejector or ejectors for producing the required vacuum, the steam from the
ejector or ejectors being utilized in heating the coils of the pan.
The accompanying Drawing represents a sectional elevation of a vacuum pan
having the said Invention applied thereto.
A is the pan, which (except as hereinafter explained) may be constructed in the
ordinary manner, and fitted with the usual accessories; B is tho pipe loading from
the pan, through which the air is to be drawn off, so as to produce the required
vacuum in the pan. For this purpose an ejector is employed, which may be of
any suitable construction, its position being indicated at C in the Drawings. The
live steam is admitted into it at the upper part, and a valve D is provided for
prevouting any return current of air. The steam from the ejector (carrying the
air with it) is conducted through a pipo E into the coils of the pan at F, and is
thus utilized in heating the said coils.
•
By closing a valve G provided in the pipe E and opening a valve H in the
pipe I the steam is cut off from the coils and exhausted into the atmosphere.
If required two or more single ejectors or a compound ejector may be used.
Having now described and particularly ascertained the nature of the said
Invention, and the manner in which the same is or may be used or carried into
effect, 1 would observe in conclusion that what I consider to bo novel and original,
and therefore claim as the Invention secured. to me by the hereinbefore in part
recited Letters Patent is,
Producing a partial vacuum in the vacuum pan and heating the coils of the pan
by the employment of an ejector or ejectors, the same being arranged and combined
with the coils, substantially in the manner herein before described and illustrated
in the accompanying Drawings.
In witness whereof, I, the said John McLaren, have to this my Specification
set my hand and seal,' this 'Eighth day of October, One thousand eight