NEW-INVENTED METHOD OF TINNING OF COPPER, WHICH WILL LAST TEN TIMES LONGER THAN THE METHOD PRESENTLY USED
Year: 1770

page_text: . TO ALL AND SUNDRY TO WHOM THIS MAY CONCERN, I, MAURICE
CRAWFORD, of the City of Edinburgh and County of Mid Lothian, in that part
of Great Britain called Scotland, Coppersmith and Brazier.
WHEREAS, upon an application to His Majesty King George the Third of
Great Britain, &c. praying His Majesty for Letters Patent in my favours for a
"NEW-INVENTED METHOD OF TINNING OF COPPER, WHICH WILL LAST TEN TIMES
LONGER THAN THE METHOD PRESENTLY USED;" and that His Majesty, by His
Letters Patent, bearing date at Westminster, the Tenth day of August, One
thousand seven hundred and seventy years, and tenth year of His Majesty's
reign, was graciously pleased to give and grant to me, my executors, ad-
ministrators, and assigns, the sole benefit and advantage of making, using,
exercising, and vending my said Invention, in that part of Great Britain called
England, the Dominion of Wales, and Town of Berwick-upon-Tweed, and
that for the space of fourteen years from and after the date of the said Letters,
under this proviso, that I should, within the space of four callander months
from the date of the said Letters Patent, cause inrol a particular description of
the nature of my said Invention, and in what manner the same is to be per-
formed, by writing under my hand, and seal, in His Majesty's Court of
Chancery in England.
THEREFORE KNOW YE, that I, in obedience to and in implement of
the said proviso, have given a description of my said Invention, as I hereby
give the said description in manner following, viz. :-
The copper must be wrought in the common way till it is ready for the first
pickling. Then pickle it off in the common way, after which it must be

page_text: freezed in the inside upon stakes cut as rough as a course file, or any other
method of freezing which opens the pores of the copper, and makes the tinning
penetrate. That being done, the copper must be pickled for the last time,
and scoured clean on both sides. Then tinn it with sal armoniack and grain
tinn, and, when properly tinned with that, take a mettle compounded of grain
tinn and zink or spelter of the following proportions, viz. :-To each pound
of grain tinn add one pound and one half pound of zink or spelter, or any
other mettle of equal wholesomeness and hardness, and with this mettle aud
sal armoniack tinn it well over, and, when so tinned, scour the outside clean,
and rough plenish it on a bright stake. Then rub the inside with chalk and
water, so that the tinn comes clean; plenish and smooth it hard, so as to bring
it to a gloss. All pieces of work that requires to be tinned on both sides,
such as ladles, scummers, &c., these must be freezed on a cutt stake with a cutt
hammer, or in such other manner as before mentioned, and dipped in the
melted mettle and finished as before mentioned. All nails must be freezed and
dipped likewise in the mettle. Which description and method of working I
hereby declare to be the method invented by me, and for which I obtained
His Majesty's Letters Patent.
In witness whereof, I have hereto set my hand and seal, at Canongate of
Edinburgh, the Thirteenth day of November, and eleventh year of the
reign of His Majesty King George the Third, and in the year of our
Lord One thousand seven hundred and seventy.
Signed and sealed, being first duly
stamped, in the presence of
WILL. YOUNG.
JOHN OGILL.
Maurice Crawford, before designed, maketh oath and sayth, that the
method and nature of tinning of copper, for which he obtained His Majestie's
Letters Patent, is that particularly above described, invented by him, and no
other noncon
2

page_text: I, Doctor James Hay, Physician in Edinburgh, hereby certifie, that Maurice
Crawford, of the City of Edinburgh, Coppersmith and Brazier, is in such a
bad state of health that it is impossible for him to be transported from this
place to any place in England, so as to attest the above Declaration or descrip-
tion before a Master Extraordinary, he having been for some time past, and
is at present, confined to his bed, and, in my opinion, will not be fitt to be
removed to England between and the Tenth day of December next.
Edin', this Thirteenth day of Nov³, 1770.
JAMES HAY, M.D.
Inrolled the Twentieth day of November, One thousand seven hundred
and seventy.