IMPROVEMENTS IN THE APPARATUS AND MEANS FOR PRODUCING ICE, AND IN COOLING FLUIDS
Year: 1834

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JACOB
PERKINS, of Fleet Street, in the City of London, Engineer, send greeting.
WHEREAS His present most Excellent Majesty King William the Fourth,
by His Letters Patent under the Great Seal of Great Britain, bearing date
at Westminster, the Fourteenth day of August, in the fifth year of His
reign, did, for Himself, Elis heirs and successors, give and grant unto me, the
said Jacob Perkins, His especial licence, full power, sole privilege and autho-
rity, that I, the said Jacob Perkins, my exors, adñiors, and assigns, or
such others as I, the said Jacob Perkins, my exors, adiñors, or assigns,
should at any time agree with, and no others, from time to time and at
all times during the term of years therein expressed, should and lawfully
might make, use, exercise, and vend, within England, Wales, and the Town
of Berwick-upon-Tweed, my Invention of "IMPROVEMENTS IN THE APPARATUS
AND MEANS FOR PRODUCING ICE, AND IN COOLING FLUIDS;" in which said Letters
Patent is contained a proviso that I, the said Jacob Perkins, shall cause a
particular description of the nature of my said Invention, and in what manner
the same is to be performed, to be inrolled in His said Majesty's High
Court of Chancery within six calendar months next and immediately after the
date of the said in part recited Letters Patent, as in and by the same,
reference being thereunto had, will more fully and at large appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
Jacob Perkins, do hereby declare the nature of my Invention, and the
mauner in which the same is to be carried into effect, are fully described and
ascertained in and by the following description thereof, reference being had
to the Drawings hereunto annexed, and to the figures and letters marked
thereon, that is to say:-

page_text: condenser and the vessel b, as shown in the Drawing. It will be seen that msot
of the parts are shown in section in order that their construction may be evident.
Having thus described the nature of my Invention, and the arrangement
of apparatus for carrying the same into effect, I will now describe the manner
of using the same. The apparatus being arranged as above described, and as
shown in the Drawing, I now prepare it for commencing work by filling every
part of the apparatus with the volatile liquid to the utter exclusion of the
atmospheric air, after which a sufficient quantity of the liquid is drawn off by
the small pump attached to the valve h to make sufficient space for the vapour,
say at least one half. The progress of the evaporation of the liquid in the
vessel 6 will depend on the quantity of vapour drawn off by the vapour pump,
as well as the quantity of caloric taken up from the liquid surrounding the
vessel b, and thereby will its temperature be cooled down even to freezing.
Having now described the nature of my Invention, and the manner of
carrying the same into effect, I would have it understood that I do not claim
the cooling of fluids by the evaporation of ether or other volatile fluids; neither
do I confine myself to the use of ether, though I prefer that fluid both as to
its cost and its property of evaporating at exceedingly low temperatures.
And I would have it understood that what I claim as my Invention is an
arrangement of apparatus or means, as above described, whereby I am enabled
to use volatile fluids for the purpose of producing the cooling or freezing of
fluids, and yet at the same tin:e constantly condensing such volatile fluids,
and bringing them again and again into operation without waste.
In witness whereof, I, the said Jacob Perkins, have hereunto set my
hand and seal, this Thirteenth day of February, in the year of our
Lord One thousand eight hundred and thirty-five