Improvements in Chimney Tops or Cans.
Year: 1891

page_text: Date of Application, 12th Feb., 1891
Complete Specification Left, 10th Nov., 1891-Accepted, 19th Dec., 1891
PROVISIONAL SPECIFICATION.
Improvements in Chimney Tops or Cans.
We, JOHN RAE and JAMES MURDOCH both Plumbers and Slaters residing at
Drumlanrig Square Hawick, do hereby declare the nature of this invention to be as
follows:-
The chimney can which forms our invention, and which may be made of metal,
stone, fireclay, or other suitable material, is constructed thus: Around the circum-
ference of the can, at a point near the base thereof, we place a series of openings,
or ventilators, so arranged that from whatever point the wind may strike the can,
it enters the can through one or more of these openings, or ventilators; and is
horne or conducted in an upward direction, towards the mouth of the can, thereby
causing a draught, or suction in the space below the opening, or ventilators. The
wind is thus turned in an upward direction by the base of the openings being, by
a curve, taper, or upward incline, continued inside the can, till it ends at a point
somewhat higher than the top of the openings. This method is applied to the
whole circumference of the can at the base of the openings, and the top of the
continuation presents the appearance of another can, somewhat cone shaped, fixed
inside the main or principal can. By this construction an upward channel is
provided for the wind, when it enters the openings or ventilators.
About the middle of the can, or between the middle and top thereof, we provide
a similar series of openings or ventilators, affording a similar upward channel to
the wind; and similar openings or ventilators may be placed at, or near the top,
or they may be placed at such point, or points in the can, as may be thought
proper or necessary.
Dated this Tenth day of February 1891.
JOHN RA E.
JAMES
MURDOCH.
COMPLETE SPECIFICATION.
Improvements in Chimney Tops or Cans.
We, JOHN RAE, and JAMES MURDOCH, both of Drumlanrig Square Hawick,
North Britain, Plumbers and Slaters, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :-
Our invention relates to improvements in chimney-tops or cans, and has for its
object to prevent back-smoke, back-draughts and blow-downs.
The chimney-can may be made of fire-clay, tin or any other suitable metal or
material, and has around its circumference near the base thereof a series of
openings so arranged that from whatever point the wind may strike the can it
enters through one or more of these openings and is carried upwards towards the
mouth of the can, thus causing a draught or suction in the chimney.
We also provide about the middle of the chimney-can a similar series of openings,
causing a further draught in the chimney; or we may place such openings at or
near the top of the chimney-can, or in any other part thereof which we might deem
necessary.
In order that our invention may be properly understood and readily carried
into effect we have hereunto appended an explanatory sheet of drawings which
we will now proceed to describe.

page_text: Figure 1 is an elevation showing our improvements.
Figure 2 is a section of the same.
A is the chimney-can; while B are the openings at the base thereof. These
openings B are curved, in an upward direction inside the can, so that the wind
will pass right up the cau, always causing a draught in the chimney, thus preventing
back-smoke or blow-downs. C are similar openings near the top of the can,
which cause a further draught in the chimney; and D are openings at the top.
Of course it is to be understood that although we have described and shown
three series of openings in the chimney-can, we do not confine ourselves to that
number, or the position in which they are placed, as they might be placed in any
other part which might be thought necessary.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
Chimney tops or cans constructed substantially as and for the purposes herein-
before described and shown on the accompanying sheet of drawings.
Dated this 9th day of November 1891
BOTTOMLEY & LIDDLE,
122, George Street, Edinburgh, Applicants' Agents.
BOTTOMLEY & LIDDLE,
122, George Street, Edinburgh, Applicants' Agents.