IMPROVEMENTS IN HOT WATER BOILERS, - OF THE KIND CALLED SADDLE BOILERS, USED FOR HEATING OR WARMING BUILDINGS, GREENHOUSES, AND FOR OTHER LIKE PURPOSES
Year: 1880

page_text: PROVISIONAL SPECIFICATION left by Robert Coles at the Office of the
Commissioners of Patents on the 6th November 1880.
ROBERT COLES, of the Firm of Coles and Matthews, of Coventry, in the County
of Warwick, Engineers and Contractors. "IMPROVEMENTS IN HOT WATER BOILERS,
-
OF THE KIND CALLED SADDLE BOILERS, USED FOR HEATING OR WARMING
BUILDINGS, GREENHOUSES, AND FOR OTHER LIKE PURPOSES."
My Invention consists in constructing and arranging the parts of saddle boilers
used for heating or warming buildings, greenhouses, and for other like purposes in
the manner herein after described, whereby the said boilers are made very durable,
their manufacture is simplified, and their heating surface increased.
Instead of constructing the said saddle boilers of plates of iron connected together
by angle bars at their base and by overlapping parts of the plates near the head of
the boiler as usual, I construct the said saddle boilers of a frame work, by preference
of channel iron, to which frame work I rivet the inside and outside plates, that is to
say, I form the arch shaped ends of the saddle boiler of channel iron, made or bent
of the required figure, the flanges or sides of the channel iron being situated out-
wards, and I connect together the arch shaped ends by rivetting to their bottoms
straight bars of channel iron, the flanges or sides of the said straight bars being
situated outwards. A frame of channel iron having external flanges is thus produced.
To this frame I rivet the top or outside plate and the inside plate of the boiler, the
rivets being passed through the external flanges of the channel iron frame of the
boiler. The rivets by which the parts of the frame of the boiler are connected
together and the covering plates connected to the said frame are by this arrange-
ment situated outside the water space of the boiler, and hence the corrosion of and
injury to the rivets commonly attending the ordinary method of construction,
where the rivets are situated within the water space are avoided. By my Invention
the construction of the boiler is also simplified.
Instead of constructing the frame of the boiler of channel iron as described,
girder iron may be used, that is iron having in cross section the figure of two bara
of channel iron arranged base to base. I prefer, however, the use of channel iron in
carrying my Invention into effect.
The channel iron or girder iron which I employ may either be made of wrought
iron by rolling or be inade of malleable cast iron or other hard and cheap metal
by casting.

page_text: In order to increase the heating surface of the saddle boiler, I arrange in the
water space of the boiler a series of horizontal fire tubes through which the heated
air and products of combustion pass, the ends of the fire tubes being fixed in the
arch shaped ends of the boiler. The rear end of the said fire tubes open into a
vertical flue at the rear end of the boiler and the front ends of the said fire tubes
open into a vertical flue at the front end of the boiler, the latter flue being in
communication with a flue around the outside and top of the boiler. The heated
air and products of combustion from the fire place at the front of the boiler pass
under the boiler to the rear end thereof, thence up the rear vertical flue, and return
through the fire tubes in the water space of the boiler to the front vertical flue,
from thence they pass to the flue on the outside and top of the boiler and escape by
the chimney.
The arrangement of internal tubes and flues described may be applied to saddle
boilers constructed in the ordinary way.