IMPROVEMENTS IN APPARATUS FOR HEATING BUILDINGS.
Year: 1878

page_text: LETTERS PATENT to William Johnson, of Dukinfield, in the County of Chester
for the Invention of "IMPROVEMENTS IN APPARATUS FOR HEATING BUILDINGS.'
PROVISIONAL SPECIFICATION left by the said William Johnson at the
Office of the Commissioners of Patents on the 19th November 1878.
"
WILLIAM JOHNSON, of Dukinfield, in the County of Chester. IMPROVEMENTS
IN APPARATUS FOR HEATING BUILDINGS."
This Invention relates to the construction of the vertical boilers and furnaces
employed for heating greenhouses, conservatories, churches, chapels and other
buildings by means of hot water.
The boiler or water space is in the form of a hollow screw or worm with a deep
thread. The cylindrical fire in the centre is closed at the top. The apparatus is
enclosed in cylindrical brickwork built up so as to touch the outer circumference of
the screw thread all round, the fire place being beneath, so that the spiral space
between the threads of the worm forms a spiral flue, winding upwards round the
outside of the cylindrical part of the boiler and surrounded on three sides by water.
By these means a very large amount of heating surface is obtained, and all the
heat is utilized for heating the water, little or more passing off by the chimney
which is connected to the upper end of the spiral flue. The flow pipe is connected
as usual to the upper part of the boiler or water space, and the return pipe to the
lower part, the usual feed cistern, safety valve, and other ordinary appliances being
also adapted and fitted in any convenient manner.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Johnson in the Great Seal Patent Office on the 17th
May 1879.
WILLIAM JOHNSON, of Dukinfield, in the County of Chester.
IN APPARATUS FOR HEATING BUILDINGS."
"IMPROVEMENTS
This Invention relates to the construction of the vertical boilers and furnaces
employed for heating greenhouses, conservatories, churches, chapels, and other
buildings by means of hot water, the object of the Invention being to obtain a
very great amount of heating surface in as small a compass as possible from the
heated gases and other products of combustion before they pass off to the chimney
or flue.
Such being the nature and object of my said Invention I will now proceed to
describe in detail the manner in which the same is to be or may be performed or
carried into practical effect, and in order that the same may be clearly understood
I have annexed hereunto a Sheet of Drawings illustrative thereof, and have marked
the same with figures and letters of reference corresponding with those in the
following explanation thereof.
Fig. 1 in the annexed Drawing is a vertical section and Fig. 2 a horizontal
section of a boiler and furnace constructed according to my Invention.
The internal portion of the boiler or water space a, a, is in the form of a hollow
screw or worm with a deep thread. The cylindrical fire space'b, b, in the centre is
closed at the top c, c. The apparatus is enclosed in cylindrical brickwork d, d, built
up so as to touch the outer circumference of the screw thread a, a, all round, the
fire place e, e, being beneath, so that the spiral space f. f, between the threads of
the worm a, a, forms a spiral flue, winding upwards round the outside of the
cylindrical part of the boiler a, a, and surrounded on three sides by water. By
these means a very large amount of heating surface is obtained, and all the heat is
utilized for heating the water, little or none passing off by the chimney g, g, which
is connected to the upper end of the spiral flue ff!
The flow pipe h, h, is connected as usual to the upper part of the boiler or water
space a, a, and the return pipe i, i, to the lower part, the usual feed cistern, safety
valve, and other ordinary appliances being also adapted and fitted in any con-
venient manner.
Having now described the nature and object of my said Invention, together with
the manner in which the same is to be or may be performed or carried into practical
effect, I wish it to be understood that I claim as my Invention, the novel construc-
tion of apparatus for heating buildings, as hereinbefore described and illustrated by
the Drawing annexed, and more especially I claim the closing of the top of the fire
space as at c, c, and the formation of the hollow spiral water space a, a, which
when enclosed in cylindrical brick work d, d, forms a spiral flue f, f, surrounded on
three sides by water, substantially as described.
In witness whereof, I, the said William Johnson, have hereunto set my hand
and seal, this Fourteenth day of May, in the year of our Lord One thousand
eight hundred and seventy nine.
WILLIAM JOHNSON. (L.S.)