NEW PIGMENT
Year: 1840

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRY
PHILIP ROUQUETTE, late of Norfolk Street, Strand, in the County of Middlesex,
but now of No. 14, Mark Lane, in the City of London, Merchant, send
greeting.
WHEREAS in consequence of a communication made to me by a certain
Foreigner residing abroad, I am in possession of an Invention, being a "NEW
PIGMENT;" and whereas Her present most Excellent Majesty Queen Victoria,
by Her Letters Patent under the Great Seal of Great Britain, bearing date at
Westminster, the Twenty-fifth day of March, in the third year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto me, the said
Henry Philip Rouquette, Her especial licence that I, the said Henry Philip
Rouquette, my executors, administrators, and assigns, or such others as I, the
said Henry Philip Rouquette, my executors, administrators, 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, "the said Invention;" in which said Letters Patent is contained

page_text: a proviso obliging me, the said Henry Philip Rouquette, by an instrument in
writing under my hand and seal, particularly to describe and ascertain the
nature of the said Invention, and in what manner the same is to be performed,
and to cause the same to be inrolled in Her said Majesty's High Court of
Chancery within four calendar months'next and immediately after the date of
the said recited Letters Patent, as in and by 'the same, reference being there-
unto had, will more fully and at large appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
Henry Philip Rouquette, do hereby declare the nature of the said In-
vention to consist in a pigment made of oxide of zinc burned, washed, and
dried and mixed with oil or tar, or both, as herein-after described, to such
consistence as may be required, according to the purpose to which it is to be
applied. And in further compliance with the said proviso I, the said Henry
Philip Rouquette, do hereby describe the manner in which the said Invention
is to be performed by the following statement thereof, that is to say:-
I take oxide of zinc, either in the state commonly called flowers of zinc (by
which I mean the fine particles that detach themselves and are carried off by
the strength of the fire in the manufacture of zinc or spelter), or in the state
of scoria or sublimate, as it is found in the upper part of furnaces where iron
or other ore containing zinc or spelter is worked, and in that state commonly
called tutty, or in the state of dust, dross, or scum, as produced by the
re-melting of the metal in zinc rolling works, or as it is found sublimed or
otherwise in factories where brass is made; or -I take a mixture of flowers of
zinc in equal parts with either of the other before-named materials, which I
prefer, and submit it to my first or burning process as follows:-
Having spread it in a finely pulverized and sifted state on the bottom of an
ordinary oven or furnace in a layer of about two inches thick, I heat it till it
ignites, keeping the bottom of the oven at a cherry-red "heat as long as any
flame is emitted from the layer, and stirring the layer the whole time. When
it ceases to flame the burning, for the purposes of the Invention; is completed,
and the 'ashes or remaining oxide being removed from the oven are put into
iron trouglis to cool, and when cool are passed through a fine sieve. The fine
powdertthus obtained I then submit to my second process of washing or
elutriation, which may be accomplished by any of the ordinary methods; but
that which I prefer is as follows:-I place a cask filled with pure cold water
on a stand about three feet from the ground. This cask must have two discharge
holes in it, ono above the other (the lower one being about one third of the
lieight of the cask from the bottom, and the upper one about two thirds); these
holes must be stopped witli plugs. The aforesaid sifted oxide or product from

page_text: the oven being placed in the water, it should be stirred briskly for, a minute or
two with a stick, and the upper plug then removed, when the water, which will
be. highly charged at first, should be allowed to run off into a vessel. placed
below to receive it. It should be allowed to run off in this manner till the
water runs clear, when the upper holes should be plugged again and the lower
hole opened, and the discharge: allowed to continue, till the water also. runs
clear from that hole, and then the lower hole should be plugged again. The
liquid mixture thus obtained should be allowed to settle, and the clear surface
water then poured off. The sediment' thus obtained should then be placed in
a slow oven, or in the sun, to dry partially; and when by evaporation it has
become of the consistence. of paste it is to be cut or divided into cakes of
three to four by two to three inches in size, and replaced in the slow oven, or
exposed to the sun to be thoroughly dried. In this state the cakes are to be
ground with oil in the same manner as white lead cakes are now treated; and
when so ground make the said pigment, more or less oil or tar being used
according to the purposes for which I require it.
Now whereas I claim as the said Invention a pigment formed by oxide of
zinc produced by burning, washing, or elutriation and drying as aforesaid,
unmixed, or mixed with oil or other suitable liquid, and if mixed then in pro-
portions varying according to the purposes to which the said pigment is to be
applied. And such Invention being, to the best of my knowledge and belief,
entirely new, and never before used within that part of Her said Majesty's
United Kingdom of Great Britain and Ireland called England, Her said
Dominion of Wales, or Town of Berwick-upon-Tweed, I do hereby declare
this to be my Specification of the same, and that I do verily believe this my
said Specification doth comply, in all respects, fully and without reserve or
disguise, with the proviso in the said herein-before in part recited Letters
Patent contained; wherefore I do hereby claim to maintain exclusive right
and privilege to the said Invention.
In witness whereof, I, the said Henry Philip Rouquette, have hereunto
set my hand and seal, this Twenty-fourth day of July, One thousand
aight hundred and forty
HENRY PHILIP (L.S.) ROUQUETTE.
Signed, sealed, and delivered, by the
within-named Henry Philip Rouquette,

page_text: AND BE IT REMEMBERED, that on the same Twenty-fourth day of July,
in the year above mentioned, the aforesaid Henry Philip Rouquette came.
before our Lady the Queen in Her Chancery, and acknowledged the Specifi-.
cation aforesaid, and all and every thing therein contained, in form above.
written. And also the Specification aforesaid was stamped according to the
tenor of the Statute in that case, made and provided.
case,
Inrolled the Twenty-fourth day of July, in the year above written.