IMPROVE- MENTS IN TUBULAR BOILERS.
Year: 1882

page_text: LETTERS PATENT to John Imray, of No. 28, Southampton Buildings,
Chancery Lane, in the County of Middlesex, for an Invention of IMPROVE-
MENTS IN TUBULAR BOILERS.-A communication from abroad by Felix
PROVISIONAL SPECIFICATION left by the said John Imray at the Office
of the Commissioners of Patents on the 23rd March 1882.
JOHN IMRAY of No 28 Southampton Buildings Chancery Lane in the County
of Middlesex "IMPROVEMENTS IN TUBULAR BOILERS." [A communication from
abroad by Felix Deloye and Alfred Guebhard, both of Paris, France.]
According to this invention there are inserted in the tubes of tubular boilers
pieces of conducting metal so arranged as to break up the direct streams of hot
gases through the tubes, to absorb from them a considerable portion of the heat
that might otherwise pass off without useful effect and to radiate and conduct this
heat to the tubes themselves so as to render them more effective as heating surface
The metal thus applied may be in the form of strips of copper or other metal of
good conducting power inserted lengthwise in the tubes, and these strips may be
twisted so as to present helical channels for the hot gases. Or a rod may be
placed in the centre of each tube having strung on it segments of discs at intervals
apart, each successive segment partly interrupting the passage for the hot gases
which may be thus caused to flow through the tube in a helical or zig-zag
course.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent fileḍ
by the said John Imray in the Great Seal Patent Office on the 4th September
1882.
JOHN IMRAY of No 28 Southampton Buildings Chancery Lane in the County
of Middlesex. "IMPROVEMENTS IN TUBULAR BOILERS." A communication from
abroad by Felix Deloye and Alfred Guebhard both of Paris France.
According to this invention there are inserted in the tubes of tubular boilers
pieces of conducting metal so arranged as to break up the direct streams of hot
gases through the tubes, to absorb from them a considerable portion of the heat
that might otherwise pass off without useful effect and to radiate and conduct
this heat to the tubes themselves so as to render them more effective as heating
surface. The metal thus applied may be in the form of strips of copper or other
metal of good conducting power inserted lengthwise in the tubes, and these strips
Or a rod may
may be twisted so as to present helical channels for the hot gases.
be placed in the centre of each tube having strung on it segments of discs at
intervals apart, each successive segment partly interrupting the passage for the
hot gases which may be thus caused to flow through the tube in a helical or zig-zag
course.
DESCRIPTION OF THE DRAWINGS
Fig. 1 is a vertical section and Fig. 2 a side view shewing a simple strip of metal,
which may be iron or copper, placed upright in a boiler tube, the draught being
thus not perceptibly impaired whilst the heat of the gases passing through the
tube is more fully utilised. When the draught is ample the strip of metal may be
helically twisted as shewn by Figs 3 and 4 and all the boiler tubes may have
these twisted strips inserted in them as shewn in Fig. 8. Where there is little risk
of deposit of soot in the tubes the obstructions for subdividing the current and
absorbing its heat may be in the form of metal segments as shewn in Fig 7 strung
on a rod at intervals as shewn in Fig. 6 and turned successively more and more
round so as to cause the current of gases to take a helical or zig-zag course within
the tubes. The tubes may generally be cleaned without removing the metal but
merely by shaking it to and fro. A hole is provided at X in the end of the plates
near the smoke box into which the attendant can introduce a hook for moving
them occasionally to remove deposit.
Having thus described the nature of the said invention and in what manner the
same is to be performed as communicated to be my foreign correspondents,
claim
Inserting in the tubes of boilers pieces of metal arranged so as to break up the
streams of hot gases and absorb from them heat which is conducted to the tubes,
substantially as herein described.
In Witness whereof I the said John Imray have hereunto set my hand and
seal this seventeenth day of August in the year of our Lord Oue thousand
eight hundred and eighty two.