AN IMPROVEMENT IN PRESERVING COPPER IN CERTAIN CASES FROM THE OXYDATION CAUSED BY HEAT
Year: 1832

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JACOB
PERKINS, of Fleet Street, in the City of London, Engineer, send.
greeting.
...WHEREAS His present most Excellent. Majesty King William the Fourth,
by His Letters Patent under the Great Seal of Great Britain, bearing date
at Westminster, the Twentieth day of November, in the third year of His
reign, did, for Himself, His heirs and successors, give and grant unto me,"
the said Jacob Perkins, His especial licence, full power, sole privilege and
authority, that I, the said Jacob Perkins, my.exors, admors, and assigns, or
such others as I, the said Jacob Perkins, my exors, admors, 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 mentioned, should and lawfully might
make,, use, exercise, and vend, within England, Wales, and Town of Ber-
wick-upon-Tweed, my Invention of "AN IMPROVEMENT IN PRESERVING
COPPER IN CERTAIN CASES FROM THE OXYDATION CAUSED BY HEAT;" in which
said Letters Patent is contained. a proviso that I, the said Jacob Perkins,
shall cause a particularly description of the nature of my said Invention, and
in..what manner the same is..to be performed, to-be inrolled in His said
Majesty's High Court of Chancery within six calendar months next and
immediately after the date of the said in part recited Letters Patent, as
in and by the same, reference being thereunto had, will more fully and at
large appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
Jacob Perkins, do hereby declare the nature of my said Invention, and the
manner in which the same is be performed, are particularly described and
ascertained in and by the following description thereof (that is to say) :-

page_text: My Invention relates to the preservation of the copper tubes used in steam
boilers particularly such as are now employed on the Manchester and Liver-
pool railroads, in which boilers the flues from the firebox or furnace consist
of a number of small copper tubes, through which the heat fumes and vapours
pass to the chimney, and it has been found that these tubes become quickly
destroyed by oxydation. Now, my improvement consists in coating the parts
of such copper tubes directly acted on by the heat, with an alloy or mixture
of copper and zinc, by which means such copper tubes will be greatly pre-
served from the effects of oxydation produced by heat.
11
But in order that my Invention may be most fully understood and carried
in effect, I will describe the means I have pursued in coating tubes, either
on the outer or inner side thereof; for, although I have particularly mentioned
the tubes used in boilers similar to those employed on the Manchester and
Liverpool railroads, in which case the inner surface of the tubes is the part
subject to the action of the heat, and vapours arising from the fire box-or
furnace, yet the same effect will be produced in coating tubes on their 'outer
surfaces, where they are used in boilers and have the water on the inside, and
the fire acting on the outer surfaces. n I mix. about two thirds of copper with
about one third, of zinc, by melting, (these being the proportions: It prefer, but
I do not confine myself thereto, as the same may be varied,). with this mix-
ture I-coat the surfaces, which are to be directly. acted on by the heat and
vapours by bringing the surface; whether the exterior or interior surfaces'so
to be coated;, in contact; with. a. quantity of the; melted alloy aforesaid, and
helping them in contact, till the melted metals or alloy. adhere all over those
surfaces of the copperį, tubes, which, are to be directly acted on by the heat.
Or, I effect, this coating in a similar. manners as is practised in joining. the two
edges of the copper in making the copper tubes, taking especial care that
there is a thin coating over every part of: that surface of the' tube which is to
be directly acted on by the heat.
:
י
Having now, described the nature of my Invention, and, the manner soft per-
forming; the,, same, I would have it, understood that what I claims as limy
Invention is the coating.copper tubes, in steam, boilers, with a mixture or an
alloy of copper and zinc as above described, and thus greatly. preserving
them from oxydation caused by heat: :
:
zot il
In witness whereof, I, the 'said Jacob Perkins, have hereunto" set my
hand and seal, this Seventeenth day of May, in the year of our Lord
One thousand eight hundred and thirty-three."
JACOB (L.s.) PERKINS.

page_text: AND BE IT REMEMBERED, that on the Seventeenth day of May, in
the year of our Lord 1833, the aforesaid Jacob Perkins came before our said
Lord the King in His Chancery, and acknowledged the Specification afore-
said, and all and every thing therein contained and specified, in form above
written. And also the Specification aforesaid was stamped according to the
tenor of the Statute made for that purpose.
Inrolled the Twentieth day of May, in the year of our Lord One
thousand eight hundred and thirty-three.