IMPROVEMENTS IN MARINE STEAM BOILERS
Year: 1867

page_text: LETTERS PATENT to Charles Mace, of 14, Green Street, Sunderland, in
the County of Durham, for the Invention of "IMPROVEMENTS IN MARINE
STEAM BOILERS."
Sealed the 31st March 1868, and dated the 2nd October 1867.
PROVISIONAL SPECIFICATION left by the said Charles Mace at the Office
of the Commissioners of Patents, with his Petition, on the 2nd October
1867.
I, CHARLES MACE, of 14, Green Street, Sunderland, in the County of
Durham, do hereby declare the nature of the said Invention for "IMPROVE.
MENTS IN MARINE STEAM BOILERS," to be as follows:-
This Invention has for its object improvements in marine steam boilers. In
marine steam boilers constructed with tubes running fore and aft of the boiler
there is at present considerable difficulty in freeing the tubes and tube plate from
the scale and deposit on them, as the arrangement of such boilers as hereto-
fore made only allows of a cleaning tool being passed between the tubes
vertically from the top downwards.
According to this Invention openings are made in the sides of the boiler
and through the water spaces between the tubes; by the openings a cleaning
tool cau be introduced laterally between the tubes so as to clean in between

page_text: them horizontally, and this in conjunction with cleaning them from the top as
heretofore practised ensures the effectual removal of the scale and deposit
from every part of the tube plate and from every part of the tubes. These
side openings into the boiler are closed with doors or covers. when the boiler
is at work.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Charles Mace in the Great Seal Patent Office on the 2nd
April 1868.
"
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, CHARLES
MACE, of 14, Green Street, Sunderland, in the County of Durham, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Second day of October, in the year of our Lord
One thousand eight bundred and sixty-seven, in the thirty-first year of Her
reign, did for Herself, Her heirs and successors, give and grant unto me,
the said Charles Mace, Her special licence that I, the said Charles Mace, my
executors, administrators, and assigns, or such others as I, the said Charles
Mace, 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 "IMPROVEMENTS IN MARINE STEAM
BOILERS," upon the condition (amongst others) that I, the said Charles Mace,
my executors or administrators, by an instrument in writing under my, or
their, or one of their hands and seals, should particularly describe and ascer-
tain 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 immediately after the date of the
said Letters Patent.
NOW KNOW YE, that I, the said Charles Mace, do hereby declare the
nature of the said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement thereof, that is to say ;-
This Invention has for its object improvements in marine steam boilers.
In marine steam boilers constructed with tubes running fore and aft of the

page_text: boiler there is at present considerable difficulty in freeing the tubes and tube
plate from the scale and deposit on them, as the arrangement of such boilers
as heretofore made only allows of a cleaning tool being passed between the
tubes vertically from the top downwards.
According to this Invention openings are made in the sides of the boiler
and through the water spaces between the tubes; by the openings a cleaning
tool can be introduced laterally between the tubes, so as to clean in between
them horizontally; and this in conjunction with cleaning them from the top
as heretofore practised, ensures the effectual removal of the scale and deposit
from every part of the tube plate, and from every part of the tubes. These
side openings into the boiler are closed with doors or covers when the boiler is
at work.
Having thus described the nature of my Invention I will proceed to
describe more fully the manner of performing the same.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a transverse section and end view, and Figure 2 is a side view
of a marine steam boiler constructed as above described, with side openings
through the exterior shell of the boiler on a line with the horizontal spaces
between the rows of tubes.
In these Figures a is the exterior shell of the boiler; b, b, b, are tubular
flues containing the fires or furnaces, as is usual; c, c, are the rows of tubes
running fore and aft of the boiler, and through which the products of com-
bustion have to pass to escape from the flues 6 into the funnel or chimney d;
e, e, are the openings made through each side of the boiler, these openings are
on a line with the horizontal spaces between the several rows of tubes.
Surrounding the several openings on each side of the boiler is a rectangular
casing fixed to the shell of the boiler, this casing is fitted with a cover f¹
which is fixed by bolts to a flange running around the outer edge of the casing,
so that the cover can readily be removed or fixed in its place; when the tubes
require cleaning these covers are removed and scrapers or cleaning tools are
passed in succession through the apertures e, and are worked to and fro hori-
zontally between the rows of tubes. The tubes are also further cleaned by tools
worked to and fro from the top of the boiler as heretofore practised, the
removal of the scale from every part of the tubes and tube plates is thus
ensured.
"
When the boiler has been cleaned the covers fare again fixed in their
places. Steam boilers of other forms than the one shown in the Drawing

page_text: may similarly be formed with an opening or openings in the shell of the boiler
on a line with the horizontal spaces between the several rows of tubes as herein
described.
In witness whereof, I, the said Charles Mace, have hereunto set my
hand and seal, this Thirtieth day of March, in the year of our Lord
One thousand eight hundred and sixty-eight.
CHARLES MACE. (L.s.)