IMPROVEMENTS IN APPARATUS FOR HEATING THE WATER SUPPLIED TO LOCOMOTIVE AND OTHER MULTITUBULAR STEAM BOILERS
Year: 1866

page_text: LETTERS PATENT to James Marshall, of Gainsborough, in the County of
Lincoln, for the Invention of "IMPROVEMENTS IN APPARATUS FOR HEATING
THE WATER SUPPLIED TO LOCOMOTIVE AND OTHER MULTITUBULAR STEAM
BOILERS."
Sealed the 6th October 1866, and dated the 18th April 1866.
PROVISIONAL SPECIFICATION left by the said James Marshall at the
Office of the Commissioners of Patents, with his Petition, on the 18th
April 1866.
I, JAMES MARSHALL, of Gainsborough, in the County of Lincoln, do hereby
declare the nature of the said Invention for "IMPROVEMENTS IN APPARATUS FOR
HEATING THE WATER SUPPLIED TO LOCOMOTIVE AND OTHER MULTITUBULAR STEAM
BOILERS," to be as follows:-
This Invention has for its object improvements in apparatus for heating the
water supplied to locomotive and other multitubular steam boilers, and consists
in the introduction of water-heating apparatus into the smoke box or lower
part of the chimney of a locomotive or other multitubular steam boiler, such
water-heating apparatus being so arranged as to admit of both the heat of the
exhaust steam and also the heat of the products of combustion in the smoke
box or lower part of the chimney being simultaneously used in heating the
water in its passage to the steam boiler. The form of the heating apparatus
may be varied, and will depend to some extent on the construction of the smoke

page_text: box or lower part of the chimney of the steam boiler. It is, however, preferred
that the heating apparatus should consist of a hollow vessel with double sides
in order that the exhaust steam may be received into and heat the interior of
such vessel, the exterior of the vessel being at the same time heated by the
products of combustion passing from the flue tubes into the smoke box or
lower part of the chimney of the steam boiler, whilst the water passing to the
boiler is contained between the double sides of the vessel. It is desirable
that the water should not pass directly through the space between the double
sides of the vessel, but that partitions or stops should be formed therein to
cause the water to take an indirect or zig-zig course through the water space.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said James Marshall in the Great Seal Patent Office on the 18th
October 1866.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JAMES
MARSHALL, of Gainsborough, in the County of Lincoln, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Eighteenth day of April, in the year of our Lord
One thousand eight hundred and sixty-six, in the twenty-ninth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said James Marshall, Her special licence that I, the said James Marshall,
my executors, administrators, and assigns, or such others as I, the said James
Marshall, 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 APPARATUS FOR
HEATING THE WATER SUPPLIED TO LOCOMOTIVE AND OTHER MULTITUBULAR STEAM
BOILERS," upon the condition (amongst others) that I, the said James Marshall,
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 James Marshall, do hereby declare the
nature of the said Invention, and in what manner the same is to be performed,

page_text: Figure 1 is a longitudinal section of the smoke box end of a multitubular
steam boiler with apparatus for heating the feed water combined therewith;
Figure 2 is a plan partly in section; and Figure 3 is an end view of the same
with the end cover removed.
a, a, is the shell of the boiler and smoke box, and a¹ the end plate in which
the boiler tubes are fixed at one end; b is the exhaust pipe from the steam
cylinder or cylinders passing through the plate a', and leading the steam into
the interior of the water heater. The water heater for convenience of con-
struction is cast in two parts c and d, which are bolted together, and the
part c is also bolted to the tube plate a¹. The part d in order that it may
conduct heat freely is by preference made in gun metal, and it is cast hollow
for the feed water to circulate within it; d' are partitions by which the water is

page_text: led in an indirect course through the beater; & is an end cover fixed by
bolts and capable of being removed when the interior of the heater requires
cleaning; e is the blast pipe leading the steam from the heater into the
chimney f; 9 is a feed pump propelling the water through the heater into the
boiler; is a pipe leading out of the heater into the boiler, there is a check
valve in this passage at h¹; c¹ is a channel in the casting c, by which any water
condensed within the heater passes away, it is connected with a pipe leading
to the water tank or other suitable receptacle. Although the arrangement
shown in these Drawings is that which I prefer, still the form of the parts
may be much varied without departing from my Invention, so long as an
apparatus for heating the feed water is placed within the smoke box, and is
kept hot partly by the hot air and products from the furnace, and partly by the
heat of the exhaust steam.
In witness whereof, I, the said James Marshall, have hereunto set my
hand and seal, this Thirty-first day of August, in the year of our
Lord One thousand eight hundred and sixty-six.
JAMES MARSHALL. (L.S.)