A NEW METHOD OF PRINTING AND COLOURING TRANSPARENCIES ON SILK, COTTON,. LINEN, OR OTHER WOVE MANUFACTURE FOR CARRIAGE AND WINDOW BLINDS, SKREENS,.. AND OTHER USEFUL AND ORNAMENTAL PURPOSES
Year: 1800

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, CHARLES
RANDOM BERENGER, of Old Bond Street, in the County of Middlesex, Print-
seller, send greeting.
WHEREAS His most Excellent Majesty King George the Third did, by
His Letters Patent under the Great Seal of Great Britain, bearing date at
Westminster, the Thirty-first day of March, in the fortieth year of His reign,
give and grant unto me, the said Charles Random Berenger, His especial licence
that I, the said Charles Random Berenger, during the term of years therein
mentioned, should and lawfully might make, use, exercise, and vend, within.
England, Wales, and the Town of Berwick-upon-Tweed, my Invention of
"A NEW METHOD OF PRINTING AND COLOURING TRANSPARENCIES ON SILK, COTTON,.
LINEN, OR OTHER WOVE MANUFACTURE FOR CARRIAGE AND WINDOW BLINDS, SKREENS,..
AND OTHER USEFUL AND ORNAMENTAL PURPOSES;" in which said Letters Patent there'
is contained a proviso, obliging me, the said Charles Random Berenger, by an
instrument in writing under my hand and seal, to 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 Majesty's High Court of Chancery within

page_text: one calendar month after the date of the said recited Letters Patent, as in and
by the same (relation being thereunto had) may more fully and at large
appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
Charles Random Berenger, do hereby declare that my said Invention is
described in manner following, that is to say:-
Any copper-plate engraved for printing transparencies on paper may be used
for this purpose. The copper plate is placed on an iron stand over a charcoal
fire, and when warm filled in with Frankfort black (or with colours if the
subject requires it), and then cleaned off. The above is done exactly in the
same way as is customary in printing on paper; the colours are likewise the
same. The copper plate is then placed in the copper-plate press on the plank,
the blankets laying on the roll of the press. The silk, linen, cotton, &c. need
not be wetted if the press is set tight, but laid carefully on the copper plate,
avoiding all wrinkles. A sheet of paper is then placed on the silk, linen, cotton,
&c. to receive the colour, which penetrates through the same; it then passes
through the press in the same way as is usual in copper-plate printing. The
impression being thus made on the silk, linen, &c., it should lay two or three
hours exposed to the air to dry; it then is strained on a wooden frame, and some
dissolved isinglass is gently washed by means of a large brush all over the
parts which are to be coloured (the isinglass is dissolved as follows):-Take an
ounce of isinglass, pour about three pints of water over it and boil it gently in
an earthen pipkin till the isinglass is mostly dissolved, then strain it through
some linen, and it is fit for use). When the isinglass on the silk is perfectly
dry, the transparency is fit for colouring. The brightest oil colours should be
used for this purpose, which are mixed in the same way as those generally used
for painting. The transparency is coloured with these front and back,
similar to paper transparencies, carefully avoiding their being laid on thick,
and and keeping the light parts perfectly clear and transparent; the very bright
parts may also be touched with transparent varnish; this, however, is not
absolutely necessary. When the colours are perfectly dry, the transparency
is then taken off the straining frame, and either fastened to the spring rollers or
strained on the frames of blinds, screens, &c.
In witness whereof, I, the said Charles Random Berenger, have here-
unto set my hand and seal, this Twenty-fifth day of April, in the
year of our Lord One thousand eight hundred.
CHARLES RANDOM BERENGER. (L.S.)

page_text: AND BE IT REMEMBERED, that on the Twenty-sixth day of April, in
the year above mentioned, the aforesaid Charles Random Berenger 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 same Twenty-sixth day of Anril in the year ahova writton
Inrolled the same Twenty-sixth day of April, in the year above written.