A CERTAIN CEMENT OR TERRAS TO BE USED IN AQUATIC AND OTHER BUILDINGS AND STUCCO WORK
Year: 1796

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, JAMES
PARKER, of Northfleet, in the County of Kent, Gentleman, sends greeting..
WHEREAS the King's most Excellent Majesty, by His Letters Patent
under the Great Seal of Great Britain, bearing date the Twenty-eighth day
of June, in the thirty-sixth year of His reign, gave and granted unto me,
the said James Parker, my executors, administrators, and assigns, His special
licence, full power, sole privilege and authority, that I, the said James
Parker, my executors, administrators, and assigns, and every of them, by
myself and themselves, or by my or their deputy or deputies, servants, or such
others as I, my executors, administrators, or assigns, should at any time agree
with, and no others, from time to time and at all times thereafter during the
term of fourteen years therein expressed, should and lawfully might make, use,
exercise, and vend my new Invention within that part of Great Britain
called England, Wales, and Town of Berwick-upon-Tweed, of "A CERTAIN
CEMENT OR TERRAS TO BE USED IN AQUATIC AND OTHER BUILDINGS AND STUCCO
WORK," in such manner as 1, my executors, administrators, or assigns, should
seem meet; and in which said Letters Patent is contained a proviso,
that if I, the said James Parker, should not particularly describe and ascer-
tain the nature of my said Invention, and in what manner the same is
to be performed, by an instrument in writing under my hand and seal, and
cause the same to be inrolled in His Majesty's High Court of Chancery
within one calendar month next and immediately after the date of the said
Letters Patent, that then the said Letters Patent, and all liberties and

page_text: advantages whatsoever thereby granted, should utterly cease, determine, and
become void, anything therein contained to the contrary thereof in any wise
notwithstanding.
NOW KNOW YE, that I, the said James Parker, in pursuance of and
compliance with the said proviso in the said recited Letters Patent contained,
do, by this present instrument, declare that the principle and nature of my said
Invention, and the manner in which the same is to be performed, is described
and ascertained as follows (that is to say) :-
The principle and nature of the said Invention consists in reducing to powder
certain stones or argillaceous productions, called noddles of clay, and using that
powder with water, so as to form a water or cement stronger and harder than
any morter or cement now prepared by artificial means. I do not know of any
precise generical term for these noddles of clay; but I mean by them, certain
stones of clay, or concretions of clay, containing veins of calcareous matter,
having frequently, but not always, water in the center, the cavity of which is
covered with small chrystals of the above calcareous matter, and tho nodles
agreeing very nearly in colour with the colour of the bed of clay in or near
which they are found. These noddles, on being burnt with a heat stronger than
tlint used for burning lime, generally assume a brown appearance, and are a
little softened; and when so burnt and softened become warm (but do not slack)
by having water thrown upon them, and being reduced to powder after burning,
'anil being mixed with water just sufficient to make into a paste, become inilu-
rated in water in the space of an hour, or thereabouts. Any argillaceous
stone, then, corresponding with this description, whether known by the name
of noddles of clay, or any other name, is the sort and kind only that I mean to
appropriate to my own use in the fermentation of my cenient.
The manner in which I prepare and compose this cement is as follows
(viz) The stones of clay or noddles of clay are first broken into small frag-
inents, then burnt in a kiln or furnace (as lime is commonly burnt) with a heat
nearly sufficient to vitrify them, then reduced to a powder by any mechanical
or 'other' opération,' and the powder so obtained is the basis of the cement.
To compose the cement in the best and most advantageous manner, T tako
two measures of water anil five measures of the powder thus described; then. I
"add the powder to the water, or the water to the powder, taking care to stir
and beat them during the whole time of intermixture; the cement is then
made, and will set or will become indurated in ten or twenty minutes after the
operation has censed, either in or out of water.
But although I have described what I consider as the best proportions for
the composition of the cement, it is expressly to be understood that these and

page_text: all other proportions are to be included within the meaning and purpose
of this Specification, but that no other proportion will produce so strong a
cement in so short a time as those I have here pointed out; and, also, that I
occasionally burn, and grind, and mix the powder before described with lime
and other stones, clay, sand, or calcined earths, in such proportions as may be
necessary and useful for the purpose that the cement is intended to be applied
to, always observing, the less water is used the better, and the sooner the
mortar or cement is used after being made, the stronger and the more durable
it will be.
In witness whereof, I, the said James Parker, have hereunto set my
hand and seal, this Twenty-seventh day of July, in the year of our
Lord One thousand seven hundred and ninety-six.
JA" (L.S.) PARKER.
Signed, sealed, and delivered by the within-
named James Parker, in the presence of
JN DYNELEY, of Gray's Inn.
THO LOGGEN, Basinghall Street.
Inrolled the same Twenty-seventh day of July, in the year above written.