Improvements in Contrivances for Economizing Fuel in Locomotive and other Engines.
Year: 1897

page_text: Date of Application, 11th Feb., 1897-Accepted, 1st May, 1897
COMPLETE SPECIFICATION.
Improvements in Contrivances for Economizing Fuel in Locomotive
and other Engines.
1 JOHN MALVERN DAME of Lahore, India, Engineer, 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 invention has for its object the economising of heat and fuel in the generation
of steam in tubular locomotive or other engine boilers and consists of a contrivance
whereby the heated products of combustion and incompletely consumed matters
which have passed from the fire box through the tubes are before passing up the
chimney thrown back in whirls and eddies and so made to contribute more heat to
the tubes, and in the case of incompletely consumed particles to be further
consumed.
I will proceed to describe my invention and how the same is to be carried out
by the aid of and in relation to the accompanying drawings which have reference
to a locomotive tubular boiler fitted with my invention.
Fig. 1 is a longitudinal section of the chimney and of the boiler showing portions
of the tubes &c.
'
Fig. 2 is a front elevation of the chimney and of the boiler with the end plate
removed.
Fig. 3 is a plan of the economiser.
The same letters apply to the same parts in the different figures.
An angle iron A is fastened along the tube plate horizontally and preferably
placed just below the nut of the stay and projecting about 4 inches at right angles
to the tube plate.
The plate B of the economiser is fixed to the angle iron A at an angle preferably
of 60 degrees. The unattached edge of the economiser extends to the centre of
the blast pipe on a line with the third row of tubes.
The economiser consists of two parallel plates B and C both of which are
perforated by slots as shewn in the figures. In practice I find that convenient
dimensions for these slots are in an ordinary case 8 inches by 21 inches so that by
bringing the slots in each plate exactly opposite to each other a full power blast
may be obtained when necessary. G. G. are two plates secured to the plate B
and bent knee shaped to keep the plate C in position and to allow it to slide
between them. D is a rod rivetted to the plate Ċ and leading out from the smoke
box to a bell crank E.
The bell crank E is actuated by means of a rod F which is continued on to
the footplate within easy reach of the driver, who can thus at will slide the
plate Cover the plate B and so open and shut the slots as required.
H. H. are two plates fixed at the same angle as the economiser plates but at
either end of them for the purpose of filling up the space round the steam pipe
and helping to carry the economiser.
The economiser produces the desired effect when the slots are partially closed
but when they are completely open little or no economising effects are produced as
the products of combustion and partially consumed matters are but slightly retarded
n their course to the chimney.
ΓΙ

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1. In a tubular boiler the combination with the tube plate of an economiser
consisting of slotted plates sliding one on the other substantially as and for the
purposes herein before described.
2. For the purpose of economising heat and fuel in a tubular boiler an
economiser consisting of slotted plates sliding one on the other substantially as
.hereinbefore described..
1
1907
THEO.
MCKENNA,
17 & 18 Basinghall Street, London, Agent.