Year: 1886

page_text: J. HENRY JOHNSON,
47, Lincoln's Inn Fields, London, W.C.,
Agent for the said James Marshall.

page_text: I, JAMES MARSHALL of the firm of Marshall Sons & Company Limited of Britannia
Iron Works, Gainsborough in the County of Lincoln Engineers do hereby declare the
nature of this Invention and in what manner the same to be performed to be
particularly described and ascertained in and by the following statement :-
The object of my Invention is to provide efficient simple and inexpensive means
whereby sparks from the furnaces of portable engines or the like are arrested.
According to my Invention I arrange around the interior of the chimney (preferably.
in an enlargement at the upper part thereof) deflecting plates attached to the inner
side of the chimney and extending inwards and downwards but leaving a central
orifice for the passage of the products of combustion. Over the central orifice of the
upper deflecting plate I support a curved plate with the convexity presented downwards.
The top of the chimney above this curved plate may be contracted by being made of a
con cal form.
The accompanying drawing represents my invention as applied to the chimney of a
portable engine the upper end (which is shewn as being enlarged at a) is fitted with
deflecting plates 6 consisting of frustums of cones arranged one above_another_and
projecting inwards and downwards there being a central passage c through these
conical deflecting plates for the products of combustion to pass through on their way
from the chimney. The passages c through the deflecting plates are of less-diameter
than the internal diameter of the chimney so that sparks from the furnace carried
up the chimney with the products of combustion will be arrested by the projecting
edges of the deflecting plates b. Above the opening in the top cone or deflecting
plate b there is a curved plate d of greater diameter than the openings. in the cones
and arranged with its convex surface downwards so that any sparks which may
ascend the space e will strike against this plate and be arrested thereby. As an
additional precaution if desired I may fit over the plate d another conical deflecting
plate e with its smaller end upwards so that should any, sparks pass the plate & they
will be arrested by the said plate e.
Having now particularly described and ascertained the nature of the said Invention
and in what manner the same is to be performed 1 declare that what I claim is :-
:-
First-In spark arresters for portable engines or the like the combination with
the chimney of the plates or surfaces 6 and d arranged as herein before described and
illustrated by the accompanying drawing.

page_text: Second-In spark arresters for portable engines or the like the combination with
the chimney of the plates or surfaces b d and e arranged as hereinbefore described and
illustrated in the accompanying drawing.
Third-In spark arresters for portable engines or the like the combination with
the chimney of an enlargement a containing the plates or surfaces b and d or b d and e
arranged as hereinbefore described and illustrated in the drawings.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C.,
Agents.