IMPROVEMENTS IN CONSTRUCTING TUBULAR STEAM BOILERS
Year: 1859

page_text: LETTERS PATENT to Nelson Kenward, of Sutton, in the County of
Surrey, for the Invention of "IMPROVEMENTS IN CONSTRUCTING TUBULAR
STEAM BOILERS."
Sealed the 7th February 1860, and dated the 9th August 1859.
PROVISIONAL SPECIFICATION left by the said Nelson Kenward at the
Office of the Commissioners of Patents, with his Petition, on the
9th August 1859.
I, NELSON KENWARD, of Sutton, in the County of Surrey, do hereby
declare the nature of the said Invention for "IMPROVEMENTS IN CONSTRUCTING
TUBULAR STEAM BOILERS," to be as follows:-
My improvements in tubular steam boilers are intended to afford a great
amount of heating surface, and a more equal distribution of the same
throughout the water space within the boiler. The external appearance of
my improved boiler is that of two long cylinders placed longitudinally one
above the other, and connected together by two or more short tubes or necks.
Steam is generated in the lower of these cylinders forming the boiler, and is
received in the upper one, which forms the steam chest; but for small boilers
I prefer substituting a dome in the usual manner to receive the steam. The
boiler is fixed at one end with an internal cylindrical furnace chamber after the
manner of a Cornish boiler, but shorter and closed at its end by a tube plate,
in which are fixed a number of small fire tubes, having their extreme ends
secured in the tube plate of smoke box (to which they lead) placed at the
other end of the boiler. A row of small water tubes are set round the top
of the furnace chamber, and the fire bridge is placed about midway between
the furnace mouth and the tube plate so as to form a chamber at the back of
the bridge.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the, said Nelson Kenward in the Great Seal Patent Office on the
9th February 1860.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, NELSON
KENWARD, of Sutton, in the County of Surrey, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Ninth day of August, in the year of our Lord
One thousand eight hundred and fifty-nine, in the twenty-third year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said Nelson Kenward, Her special licence that I, 'the said Nelson Kenward,
my executors, administrators, and assigns, or such others as I, the said Nelson
Kenward, 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
CONSTRUCTING TUBULAR STEAM BOILERS," upon the condition (amongst others)
that I, the said Nelson Kenward, my executors or administrators, by an
instrument in writing under my, 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 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 Nelson Kennard, 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 fol-
Jowing statement thereof, reference being had to the accompanying Drawings,
and to the figures and letters marked thereon (that is to say):
-
My improvements in steam boilers are intended to afford a great amount of
heating surface combined with a more equal distribution of the same through-
out the water space within the boiler. The shell of my improved boiler is
cylindrical, and is fitted at one end with an internal cylindrical furnace
chamber, and at the other end with an ordinary smoke box. The furnace
chamber I make about one-half the length of the boiler, and its extreme end
is closed by a tube plate, in which I fix a number of small fire tubes leading
into the smoke box before-mentioned. I arrange round the top of the furnace
chamber a row of water tubes passing from the extreme end of furnace
through the furnace chamber, and communicating with a water space which

page_text: is formed in the interior of a jacket placed above the furnace mouth on the
front of boiler. I place the fire bridge (in some cases formed hollow to
contain water) in advance of tube plate, so as to form a combustion chamber
at the back of the bridge. The boiler is intended to be nearly filled with
water, and the steam chest, a longitudinal cylinder placed on the top of the
boiler, is connected thereto by means of two or more short necks or tubes.
In portable or small boilers I arrange a water jacket round the interior of
smoke box, and in some cases use an ordinary dome-shaped steam chest instead
of the longitudinal cylindrical one above mentioned.
In order to explain my said Invention more fully, I now proceed to describe
the Drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a longitudinal section of a boiler constructed according to my
Invention; Figure 2 is a part front elevation of the same; and Figure 3 is a
transverse section taken on the line A, B, in Figure 1; Figure 4 is a longi-
tudinal section of a small or portable boiler; and Figure 5 is a transverse
section of the same on the line C, D, in Figure 4. The same letters of refer-
ence denote the same parts in each Figure. A, A, is the shell of boilers';
B, B, the furnace chamber; C, the smoke box; D, D, the fire tubes leading
from the furnace chamber to smoke box; E, E, the water tubes; F, the
water space in front of boiler; G, the fire bridge; H, the fire bars; J, the
combustion chamber; K, K, the steam chest connected to boiler by the
neck L, L; and M, M, the jacket or water space placed in the interior of
smoke box.
Having now described the nature of my said Invention, and the manner of
performing the same, I would have it understood that what I claim is, the
construction and arrangement of tubular steam boilers, as herein shewn and
described.
In witness whereof, I, the said Nelson Kenward, have hereunto set my
hand and seal, this Sixth day of February, in the year of our Lord
One thousand eight hundred and sixty.
NELSON ZENZA DD