A METHOD OF SWEETENING, PURIFYING, AND REFINING GREENLAND WHALE AND SEAL OIL
Year: 1814

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRY
WILLIAM VANDER KLEFT, of No. 253, High Holborn, in the County of
Middlesex, Gentleman, send greeting.
WHEREAS His most Excellent Majesty King George the Third, by His
Letters Patent under the Great Seal of Great Britain, bearing date at West-
minster, the Twenty-sixth day of July, in the fifty-fourth year of His reign,
did, for Himself, His heirs and successors, give and grant unto me, the said
Henry William Vander Kleft, His special licence that I, the said Henry
William Vander Kleft, my executors, administrators, and assigns, or such others
as I, the said Henry William Vander Kleft, my executors, administrators, and
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 "A METHOD OF SWEETENING, PURIFYING,
AND REFINING GREENLAND WHALE AND SEAL OIL ; in which said Letters Patent
there is contained a proviso, obliging me, the said Henry William Vander
Kleft, by an instrument in writing. under my hand and seal, particularly to
describe and ascertain the nature of my said Invention, and in what manner
the same is to be performed, and to cause the same to be enrolled in His
Majesty's High Court of Chancery within two calendar months next and
immediately after the date of the said recited Letters Patent, as in and by the
same; reference being thereunto had, will' more fully and at large appear.

page_text: NOW KNOW YE, that in compliance with the said proviso, I, the said
Henry William Vander Kleft, do hereby declare that the nature of my said
Invention, and the manner in which the same is to be performed, is described
and ascertained in the following explanation thereof, that is to say:-
The oil in its raw state is filtered through bags about forty-one inches long,
with circular mouths extended by a wooden hoop about fifteen inches in
diameter fixed thereto; these bags are made of jean, lined with flannel, between
which jean and flannel powdered charcoal is placed throughout to a regular thick-
ness of about half an inch, for the purpose of retaining the glutinous particles
of the oil and straining it from impurities, and the bags are quilted to prevent the
charcoal becoming thicker in one part than another, and to keep the linings
more compact. The oil is pumped into a large funnell made of tin, annexed
to the pump through a perpendicular pipe, and passes from the funnell into
another pipe placed over the bags horizontally, from whence it is introduced
into them by cocks. The oil runs from the filtering bags into a cistern, about
eight feet long by four feet broad, and four and an half feet deep, made of
wood lined with lead, and containing water at the bottom about the depth of
five or six inches, in which are dissolved about six ounces of blue vitriol, for
the purpose of drawing down the glutinous and offensive particles of oil which
have escaped through the charcoal, and thereby rendering it clear and free
from the unpleasant smell attendant upon oil in the raw state. And in order
to enable the oil thus to run from the bags, they are hung in a frame or rack
made like a ladder, with the spokes or rails at sufficient distances to receive the
hoop of the bag between two, and such frame or rack is placed in a horizontal
position over the cistern. The oil is suffered to run into the cistern until it
stands to the depth of about two feet in the water, and there to remain for
three or four days (according to the quality of the oil), and is then drawn off
by a cock, which is fixed in the cistern a little above the water, into a tub or
other vessel, when it will be found to be considerably purified and refined.
And the oil after having undergone this operation may be rendered still more
pure by passing a second or third time through similar bags and cisterns; but
the oil after such second and third process is drawn off into and filtered
through additional bags, made of jean, lined with flannel, inclosed in other bags
made of jean doubled, when the process is complete.
In witness whereof, I, the said Henry William Vander Kleft, have here-
unto set my hand and seal, the Eleventh day of August, in the year of
our Lord One thousand eight hundred and fourteen.
H. W. VANDER KLEFT.
KLEFT. (L.B.)

page_text: AND BE IT REMEMBERED, that on the same Eleventh day August,
in the year above mentioned, the aforesaid Henry William Vander Kleft
came before our Lord the King in His Chancery, and acknowledged the
Specification 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.
Inrolled the come Floventh day of A
in the woox chaves wition