AN IMPROVED METHOD OR MEANS FOR PRESERVING THE INTERIOR PARTS OF STEAM BOILERS
Year: 1874

page_text: LETTERS PATENT to Josiah Barrett, of 1, Devonshire Terrace, Catherine
Grove, Greenwich, in the County of Kent, Ship Builder, and John
Philip Rawlings, of 16, East Ferry Road, Poplar, in the County' of
Middlesex, Engineer, for the Invention of "AN IMPROVED METHOD
OR MEANS FOR PRESERVING THE INTERIOR PARTS OF STEAM BOILERS."
Sealed the 7th July 1874, and dated the 15th May 1874.
PROVISIONAL SPECIFICATION left by the said Josiah Barrett and
John Philip Rawlings at the Office of the Commissioners of
Patents, with their Petition, on the 15th May 1874.
We, JOSIAH BARRETT, of 1, Devonshire Terrace, Catherine Grove,
Greenwich, in the County of Kent, Ship Builder, and JOHN PHILIP
RAWLINGS, of 16, East Ferry Road, Poplar, in the County of Middlesex,
Engineer, do hereby declare the nature of the said Invention for "AN
IMPROVED METHOD OR MEANS FOR PRESERVING THE INTERIOR PARTS OF STEAM
BOILERS," to be as follows:-
This Invention consists in substituting a special kind of metal, vizt.,
pure tin in licu of the metal now used in the construction of condenser

page_text: tubes, tube plates, air-pump buckets, foot and head valves, guards, and
all the internal parts of marine and other boilers, which will entirely
destroy the action that now takes place in such boilers by reason of the
feed water coming in contact with the metal at present used in the con-
struction of such boilers and condensers.
•
The result to be obtained by this Invention will be the prevention (by
destroying the action) of the destruction of the boiler, and prevention of
the splitting of the tubes in the condenser and the rivet heads, plates,
boiler stays, and tubes, will be effectually preserved..
The Invention can be carried out without any alteration taking place
in the designs of boilers at present in use, and the cost of the special
metal intended to be used will not exceed the cost of that now in use.
SPECIFICATION in pursuance of the conditions of the Letters Patent
filed by the said Josiah Barrett and John Philip Rawlings in the
Great Seal Patent Office on the 14th November 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, JOSIAH
BARRETT, of 1, Devonshire Terrace, Catherine Grove, Greenwich, in the
County of Kent, Ship Builder, and JOHN PHILIP RAWLINGS, of 16, East
Ferry Road, Poplar, in the County of Middlesex, Engineer, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fifteenth day of May, in the year of
our Lord One thousand eight hundred and seventy-four, in the thirty-
seventh year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto us, the said Josiah Barrett and John Philip
Rawlings, Her special licence, that we, the said Josiah Barrett and John
Philip Rawlings, our executors, administrators, and assigns, or such
others as we, the said Josiah Barrett and John Philip Rawlings, our
executors, administrators, and assigns, should at any time agree with,
and no others, from time to time and at all times thereafter during the
term therein expressed, should and lawfully might make, use, exercise,
and vend, within the United Kingdom of Great Britain and Ireland,
the Channel Islands, and Isle of Man, an Invention for "AN IMPROVED

page_text: "
METHOD OR MEANS FOR PRESERVING THE INTERIOR PARTS OF STEAM BOILERS,'
upon the condition (amongst others) that we, the said Josiah Barrett
and John Philip Rawlings, our executors or administrators, by an
instrument in writing under our, or one of our or their, or one of their
hands and seals, should particularly describe and ascertain the nature
of the said Invention, and in what manner the same was to be per-
formed, and cause the same to be filed in the Great Seal Patent Office
within six calendar months next and immediately after the date of the
said Letters Patent.
NOW KNOW YE, that I, the said John Philip Rawlings, on behalf
of myself and the said Josiah Barrett, do hereby declare the nature
of our said Invention; and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following
statement thereof, that is to say :-
This Invention is designed to obviate that destruction of the iron or
steel composing steam boilers, which results from the action upon such
iron or steel of feed water having contact with other metal, such as
copper and brass used in the construction of the condensers and the
appurtenances thereof and of the boilers, as for instance the condenser
tubes and tube plates, air-pump buckets, food and head valve, seatings,
guards, feed pipes, scum pipes, and other parts against which con-
densation of exhaust steam or vapour takes place, or with which the
water of condensation or feed water may have contact.
of
In lieu of constructing such parts as heretofore of copper and brass, or
copper coated with tin, or brass coated with tin, we construct the said
parts wholly of pure tin, or the best tin that can be procured.
Our Invention can be carried out without any alteration in the design
of boilers and condensers at present in use.
In applying our Invention to existing boilers and condensers having
iron tube plates we proceed as follows:-We remove all brass and copper
boiler fittings such as scum pans and pipes, internal feed pipes, and
water gauge pipes, and in lieu thereof we provide and fit similarly
formed parts constructed wholly of tin as aforesaid.
We also take out all brass and copper tubes forming parts of the con-
densers, and in lieu thereof we fix similarly formed tubes composed
wholly of tin as aforesaid, which tin tubes may be placed in position and

page_text: secured at the ends in the ordinary manner of placing and fixing brass
and copper tubes. The tin tubes may be made secure in their plates by.
means of a tube expander. This plan saves much time and expense.
By our Invention we prevent the destruction of the boiler arising
from the cause herein-before mentioned, and we effectually preserve the
rivet heads, plates, stays, and tubes. Moreover the tin tubes will not be
liable to split as do tubes made of brass.
We are aware it has been attempted to prevent the destructive action
herein-before referred to by tinning the copper and brass tubes of con-
densers, but this has not been found to answer the purpose, nor do we
lay any claim to the use of tin as a coating material, but what wo
consider to be novel and original and therefore claim as the Invention
secured to us by the herein-before in part recited Letters Patent is, the
new or improved method or means of preserving tho interior parts of
steam boilers by the application and use of pure tin or the best tin that
can be obtained, substantially as herein described and set forth..
In witness whereof, I, the said John Philip Rawlings, on behalf of
myself and the said Josiah Barrett, have hereunto set my hand
and scal, this Fourteenth day of November, in the year of our
Lord One thousand eight hundred and seventy-four.
JOHN PHILIP RAWLINGS. (L.S.) ·