Year: 1889

page_text: A communication from F. A. GARDNER & Co., Catskill, New York State, United
States of America, Engineers.
I, RICHARD MORLEY HARISON, of 99, Douglas Street, Glasgow, in the County
of Lanark, North Britain, Engineer, do hereby declare the nature of this invention
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement, that is to say :-
This Invention has for its object to improve the construction and increase the
economical efficiency of steam boilers; and a steam boiler as constructed according to
the Invention is delineated on an accompanying sheet of explanatory drawings, figure,
1, of which is a vertical section whilst figure, 2, is an inverted sectional plan of the
upper part of the boiler. In these drawings the same reference letters are used to
mark the same or like parts wherever they are repeated.
The upper part of the improved boiler comprising the steam space and the upper
part of the water space is in the form of a drum, A, which is circular in plan and has
horizontal top and bottom plates, B, C. From the centre of the bottom plate, C, a
large vertical tube, D, extends downwards and has connected to its bottom, otherwise
closed end, a feed inlet pipe, E, and a blow-off pipe, F, both fitted with stop cocks.
Small circulating pipes, G, which are made with bends or elbows, are connected to the
central vertical tube, D, and extend outwards horizontally and obliquely and upwards,
finally entering the circumferential shell of the drum, A, at a height a little above the
water surface in the drum, their upper ends terminating in nozzles, H, projecting
into the drum and directed somewhat downwards. The circumferential shell, J, of
the drum, A, extends downwards and encloses a furnace chamber, K, at the lower
part of which there is a conical flange, L, forming the sides of a fuel box which has
at its bottom an annular grate, M, made with a central sleeve, N, which encompasses
the lower part of the vertical tube, D. The grate, M, has teeth formed round the
under side of its outer edge with which there gears a pinion, P, on a spindle turnable
by means of an external crank handle, Q. A door, R, is provided at one side for

page_text: introducing fuel and another door, S, is provided for removing ashes. The grate, M,
is arranged to be turned so that any part of it may be brought near the door, R, and
to facilitate the proper distribution of the fuel.
Tubes, T, are fixed from the bottom to the top plates, C, B, of the drum, A, for
the passage upwards of a portion of the fire gases, the remainder passing up between
the circumferential part of the drum and an outer shell, U, which encloses the entire
boiler and has a chimney, V, fixed to its top.
With the improved construction hereinbefore described the water in the boiler is
kept in vigorous circulation through the action of the intense heat on the circulation
pipes, G, the water becoming expanded in these pipes and partly formed into steam,
and rising up the vertical parts of the pipes in consequence of being lighter than the
denser water in the central vertical tube, D.
Having now particularly described and ascertained the nature of the said Inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. In combination, the drum, A, the central vertical tube, D, extending down from
the drum, and the circulating pipes, G, proceeding from the central vertical tube
through the fire space up to the drum, substantially as hereinbefore described.
2. Making the circulating pipes, G, which extend from the central vertical tube,
D, to the drum, A, with bends or elbows, as hereinbefore described.
3. The combination of parts forming the complete boiler and comprising the
drum, A, central vertical tube, D, the circulating pipes, G, the fire-grate, M, the
means for turning the fire-grate, the fire-gas tubes, T, through the drum, and the
outer shell, U, with its chimney, substantially as hereinbefore described.
Dated this Twenty-eighth day of February 1889.
EDMUND HUNT,
Applicant's Agent.