Improvements
Year: 1897

page_text: I, JOHN MARTIN, of 60, Market Street, Melbourne, in the Colony of Victoria,
Insurance Agent, do hereby declare the nature of this invention to be as follows:-
My said invention relates to improvements in or applicable to steam boiler and
other furnaces.
According to my said invention I use one or more air tubes for receiving air
heating it and delivering it into the furnace in a direction opposed to the direction
of the main draught.
As applied for example to an ordinary Cornish boiler air tubes taking in air
from the outside are led along the flue at the back of the bridge so that the air
in the tubes becomes heated by the products of combustion on their way to the
chimney. The tubes pass from the flue through or over the bridge and direct or
deliver the heated air into or towards the zone of imperfect combustion over the
fuel on the grate bars. This heated air supply may be simply induced by the
draught of the chimney or may be obtained by a forced draught through
the tubes. Such heated air may partly or wholly replace the ordinary air supply.
In some cases the delivery orifices of the tubes may be contracted or flattened.
Dated this 5th day of July 1897.
E. T. WHITELOW, A. M. Inst. C.E.,
70, Deansgate, Manchester, Agent for the Applicant.
Improvements in or applicable to Steam Boiler and other Furnaces.
I, JOHN MARTIN, of 60, Market Street, Melbourne, in the Colony of Victoria,
Insurance Agent, 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:-
My said invention relates to improvements in or applicable to steam boiler and
other furnaces.
According to my said invention I use one or more air tubes for receiving air
heating it and delivering it into the furnace in a direction opposed to the direction
of the main draught.
The accompanying drawings to which reference is hereinafter made illustrate
the application of my said invention as applied by way of example to an ordinary
Cornish or Lancashire boiler.
Fig. 1 is an elevation partly in section.

page_text: Fig. 2 is a section through a portion of the furnace.
An air tube or tubes a take in air from the outside and are led along the flue
and the furnace to the back of the bridge b so that the air in the tubes becomes
heated by the products of combustion on their way to the chimney. The tubes
pass from the flue through or over, the bridge b and direct or deliver the heated
air into or towards the zone of imperfect combustion over the fuel on the grate
bars. This heated air supply may be simply induced by the draught of the
chimney or may be obtained by a forced draught through the tubes. Such
heated air may partly or wholly replace the ordinary air supply.
In some cases the delivery orifice or orifices of the tube or tubes may be con-
tracted or flattened out into a fan like form as shown at a¹ in Fig. 2.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed I declare that what I
claim is:-
:-
The combination with a steam boiler or other furnace of an air supply tube (or
tubes) heated by the products of combustion and delivering its contents immediately
over the grate bars in a direction opposed to the direction of the main draught
substantially as described and set forth.
Dated this 5th dor of Annil 1000
E. T. WHITELOW, A. M. Inst. C.E.,
70, Deansgate, Manchester, Agent for the Applicant.
E. T. WHITELOW, A. M. Inst. C.E.,
70, Deansgate, Manchester, Agent for the Applicant.