IMPROVEMENTS IN THE MANUFACTURE OF AERATED WATER
Year: 1845

page_text: - DUNLOP'S SPECIFICATION.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ARCHIBALD
DUNLOP, junior, of Thames Street, in the City of London, Gentleman, send
greeting.
WHEREAS Her present most Excellent Majesty Queen Victoria, by Her
Royal Letters Patent under the Great Seal of Great Britain, bearing date
at Westminster, the Fourth day of December, in the ninth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said Archibald Dunlop, my exors, admors, and assigns, Her especial licence;
full power, sole privilege and authority, that I, the said Archibald Dunlop,
my exors, admors, and assigns, or such others as I, the said Archibald
Dunlop, my exors, admors, 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 MANUFACTURE OF AERATED WATER;" in which said
Letters Patent is contained a proviso that I, the said Archibald Dunlop,
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 Her 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
Archibald Dunlop, do hereby declare that the nature of my said Invention,

page_text: and the manner in which the same is to be performed, are fully described
and ascertained in and by the following statement thereof, that is to say:-
My Invention consists of, improvements in the manufacture of aerated
waters containing bicarbonate of lime in-solution; and in order that my In-
vention may be fully understood I will proceed to describe the means pursued
by me, first, however, remarking that heretofore in making aerated waters
containing bicarbonate of lime, for, which Letters Patent were granted to
William Maugham, lime water has been used, and it is well known that water
will only hold a definite quantity of lime in solution; hence aerated bicarbonate
of lime water made therefrom depends for its strength on the quantity of lime
in the original lime water. Now my Invention consists in using carbonate of
lime in a finely divided state in water and causing it to dissolve by additional
carbonic acid, by which I can not only. obtain an aerated solution of bicar-
bonate of lime of a similar strength to that before made, but I can also
obtain it at greater strength when desired.
In making aerated water according to my Invention I obtain carbonate
of lime in as pure à condition as I can, and in a minute state of
division; this may be done by employing, white Carrara marble reduced to
a fine powder by mechanical means, or by precipitating carbonate of lime
from lime water by means of carbonic acid, or by employing a soluble
salt of lime, such as muriate of lime (chloride of calcium), and precipitate,
therefrom pure carbonate of lime by means of carbonate of soda, as is
well understood. by chemists, and I make no claim to any process for ob
taining, carbonate of lime in as pure a state as may be; but so far as my
experience goes. I believe the best mode of obtaining it for the purposes of my
Invention is from muriate of lime, as last mentioned. The pure carbonate of
lime in a state of minute division (however obtained) is to be mixed with
water; I usually employ sixteen grains or upwards to each pint of water,
according as it may be required. The carbonate, of. lime is to be kept mecha-
nically suspended in the water by means of an apparatus adapted to this
purpose, and whilst yet turbid passed into another apparatus, such as is used
in making soda water, which latter apparatus should be made strong enough
to resist a pressure of at least five hundred and forty pounds on the square
inch, and I dissolve the carbonate of lime by introducing into the vessel
carbonic acid, and I ascertain whether it is dissolved by withdrawing a small
quantity, when, if the water is perfectly clear and transparent, it will indicate
that the process is complete. I then bottle off the water in the same manner
as other aerated waters have, been heretofore bottled.
Having thus described the nature of my Invention, and the manner in
.

page_text: which the same is to be performed, I would have it understood that I do not
claim the manufacture of aerated solution of bicarbonate of lime generally, as
that has long been done by me under the said Patent of William Maugham;
but what I claim is the mixing carbonate of lime finely divided with water.
and applying carbonic acid thereto so as to produce an aerated solution of
bicarbonate of lime.