IMPROVED STEAM GENERATORS
Year: 1874

page_text: LETTERS PATENT to William Henry Northcott, of Cambridge Gardens,
Notting Hill, London, for the Invention of "IMPROVED STEAM
GENERATORS."
Sealed the 15th December 1874, and dated the 25th June 1874.
PROVISIONAL SPECIFICATION left by the said William Henry
Northcott at the Office of the Commissioners of Patents, with his
Petition, on the 25th June 1874.
I, WILLIAM HENRY NORTHCOTT, of Cambridge Gardens, Notting Hill,
London, do hereby declare the nature of the said Invention for
"IMPROVED STEAM GENERATORS," to be as follows:-
In the construction of my improved steam generator or boiler I
combine a series of tubes containing the water and forming also the
heating surface with a chamber for water and steam, formed with a flat
surface and provided with a faced joint put together by bolts so as to
allow of the chamber being taken apart and to give access to the interior
for examination, cleaning, repairing, &c. The chamber is generally
made of a section approaching the rectangle, and I place it over and

page_text: upon the furnace and flues, keeping it about half filled with water.
The tubes containing water are suspended from and attached to the
under side of this chamber and thus come within the flues, so that they
are surrounded on all sides by the hot furnace gases. They are generally
plain pendulous or hanging tubes closed up at the bottom, and with or
without internal circulating tubes; or they may be U or syphon tubes.
In some cases I connect the plain or the syphon tubes together at
their lower ends by other pipes lying horizontally, or nearly so; and in
some cases I form the furnace sides of water spaces after the manner of
a locomotive fire-box, and place curved circulating tubes in connection
with the top and side water chambers, or inclined tubes from one water
casing to the other across the furnace, or both.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Henry Northcott in the Great Seal Patent
Office on the 23rd December 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
HENRY NORTHCOTT, of Cambridge Gardens, Notting Hill, London, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-fifth day of June, in the year
of our Lord One thousand cight hundred and seventy-four, in the
ycar of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said William Henry Northcott, Her
special licence that I, the said William Henry Northcott, my exc-
cutors, administrators, and assigns, or such others as I, the said a
William Henry Northcott, my 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 "IMPROVED STEAM GENERATORS," upon the con-
dition (amongst others) that I, the said William Henry Northcott, my
executors or administrators, by an instrument in writing under my,
or their, or one of their hands and seals, should particularly describe

page_text: and ascertain the nature of the said Invention, and in what manner
the same was to be performed, and cause the same to be filed in the
Great Seal Patent Office within six calendar months next and immedi-
ately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said William Henry Northcott, do hereby
declare the nature of my said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and
by the following statement:-
In the construction of my improved steam generators or boilers I
combine a series of tubes containing the water and forming also the
heating surface with a chamber for water and steam formed with a flat
surface and provided with a faced or other joint, put together by bolts so
as to allow of the chamber being taken apart, giving access to the
interior for examination, cleaning, and repairs, &c. The chamber I
generally make of a section approaching the rectangle, and I place it
over and upon the furnace and flues, keeping it about one-half filled
with water. The tubes containing water are suspended from and and
attached to the under side of the chamber, and thus come within the
furnace and flues so that they are surrounded on all sides by the hot
furnace gases. The tubes are sometimes plain pendulous or hanging
tubes, closed at the bottom, and with or without internal circulating
tubes; or they may be U or syphon tubes.
In some cases I connect the plain or the syphon tubes together at
their lower ends by horizontal pipes; and in some cases I form the
furnace sides of water spaces after the manner of a locomotive boiler
fire-box, and place curved circulating tubes in connection with the top
and side water chambers or inclined water tubes from one water space
to the other.
For the more effectual explanation of my improved steam generators
I append hereto three Sheets of Drawings.
Sheet 1 gives side and end sectional elevations, plan, and details of
one form of my improved boiler. A is the flat chamber; B is the joint
made with bolts as described; C, C, are two long spaces partitioned off
from the rest of the boiler by longitudinal sheet-iron partitions so that
the water being quiescent in these spaces sedimentary matters may in
them be deposited and blown off at intervals; D, D, D, show the
nendulous tubes.

page_text: the pendulous tubes are made of greater length, and the flues arranged
so that the furnace gases pass across and amongst the tubes three times
on their way to the chimney.
In witness whereof, I, the said William Henry Northcott, have
hereunto set hand and seal, this Twenty-first day of December
One thousand eight hundred and seventy-four.
on their way to the chimney.
In witness whereof, I, the said William Henry Northcott, have
hereunto set hand and seal, this Twenty-first day of December
One thousand eight hundred and seventy-four.
WILLIAM HENRY NORTHCOTT. (L.S.)