Improvements in Steam Boilers.
Year: 1889

page_text: Date of Application, 19th Feb., 1889
Complete Specification Left, 19th Nov., 1889-Accepted, 21st Dec., 1889
PROVISIONAL SPECIFICATION.
Improvements in Steam Boilers.
I, DAVID MCQUEEN, Factor, Wishaw Estate Office, Wishaw, Lanarkshire, do hereby
declare the nature of this Invention to be as follows:-
This Invention which relates to steam boilers and is particularly applicable in con-
junction with the improvements in boiler furnaces described in the Specification of
my Patent Number 15810 of 1887, has for its object to facilitate rapid steam
raising.
In a Lancashire boiler or other boiler having an internal flue or flues I construct
the flue with two depending water bridges formed by cutting the upper side of the
flue shell and rivetting or otherwise fitting in the cut orifices water boxes which
extend transversely of the flue and reach down to within a short distance of the fire
grate, one such box being fitted near the front of the boiler or behind the fire door
and the other at the rear of the furnace in front of the fire bridge. These water boxes
or bridges are open at top to the water and steam space of the boiler and they are
connected within the furnace or combustion chamber by longitudinal water tubes
whose ends are expanded or otherwise fitted in orifices formed for their reception in
the shells of the boxes. The water boxes and their connecting tubes being within the
furnace flue are subjected to the full heat of the furnace and rapid heating and circula-
tion of the water within them and in the boiler consequently takes place, resulting in
rapid steam raising.
In the case of Egg-ended boilers and other boilers having furnace flues external to
the shell of the boiler I form water boxes or bridges connected by longitudinal water
tubes in the manner above described but depending from the lower side of the boiler
shell over the furnace or combustion chamber.
Dated this Eighteenth day of February 1889.
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in Steam Boilers.
I, DAVID MCQUEEN, Factor, Wishaw Estate Office, Wishaw, Lanarkshire, 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
This Invention which relates to steam boilers and is particularly applicable in con-
junction with the improvements in boiler furnaces described in the Specification
of my Patent Number 15810 of 1887, has for its object to facilitate rapid steam
raising.
In a Lancashire boiler or other boiler having an internal flue or flues, I construct the
flue as represented at figure 1 of the accompanying drawings with two depending water
bridges formed by cutting the upper side of the flue shell A, and rivetting or other-
wise fitting in the cut orifices, water boxes B, B, which extend transversely of the
flue and reach down to within a short distance of the fire grate C one such box being
fitted near the front of the boiler or behind the fire door and the other at the rear of
the furnace in front of the fire bridge. These water boxes or bridges are open at top
to the water and steam space of the boiler and they are connected within the furnace
or combustion chamber by longitudinal water tubes D whose ends are expanded or
otherwise fitted in orifices formed for their reception in the shells of the boxes.

page_text: Figure 2 is an enlarged sectional view showing a convenient mode of connecting the
pipes to the water boxes to permit of movement of the pipes due to expansion and
contraction. The water boxes and their connecting tubes being within the furnace
flue are subjected to the full heat of the furnace and rapid heating and circulation of
the water within them and in the boiler consequently takes place, resulting in rapid
steam raising.
In the case of Egg-ended boilers and other boilers having furnace flues external to
the shell of the boiler as represented at figures 3 and 4, I form water boxes or
bridges B, B, connected by longitudinal water tubes D) in the manner above described
but depending from the lower side of the boiler shell A¹, over the furnace or combus-
tion chamber C.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what I
claim is :-
1. In a steam boiler, an internal flue formed with depending bridges open to the
water space of the boiler and connected by water tube substantially as described.
2. A steam boiler formed with water boxes or bridges depending from its shell
and connected by water tubes within the combustion chamber substantially as
described.
Dated this Eighteenth day of November 1889.
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow, Agents.