IMPROVEMENTS IN VENTILATORS
Year: 1884

page_text: I, GEORGE STEVENSON BUCHANAN, of 43 Lansdowne Crescent, Glasgow, in the
county of Lanark, Agent, do hereby declare the nature of my said Invention for
"IMPROVEMENTS IN VENTILATORS," to be as follows:-
This invention consists of improvements in the construction of ventilators of the
kind employed in halls, churches, and other large buildings for conveying away the
hot and noxious products of the gas employed in lighting the building, along with
a proportion of the vitiated air rising upwards to the roof.
The improved ventilator is formed by a series of cylindrical or slightly tapered
tubes of different diameters which are fitted concentrically round the gas pendent
or pendents. The central tube extends down a considerable distance from the roof,
the tube surrounding it a less distance, the succeeding tube still less, and so on, so
that the tubes, which are by preference slightly expanded near the rim or mouth,
appear like an inverted cone. The upper ends of the tubes terminate in an opening
in the roof, communicating with a ventilating tube which is carried up to a higher
level or through the roof. The upward draft through the ventilating tubes creates
an upward current of the heated air and waste products from the gas burning
underneath and of the vitiated air in the building which converges towards the
series of tubes, and the whole passes through the ventilating tubes, and through
the roof to the outer air.
'
Instead of being formed from a series of tubes the improved ventilator may be
made from a sheet of metal coiled in the form of a volute or spiral.
This construction of ventilator has the advantage that shadows of parts are not
cast on the roof, and the burners may be fitted at a lower level than usual.
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page_text: "
I, GEORGE STEVENSON BUCHANAN, of 43 Lansdowne Crescent, Glasgow, in the
County of Lanark, Agent, do hereby declare the nature of my Invention for
"IMPROVEMENTS IN VENTILATORS;' and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
This Invention consists of improvements in the construction of ventilators of the
kind employed in balls, churches, and other large buildings for conveying away
the hot and noxious products of the gas or other illuminant employed in lighting
the building, along with a large proportion of the vitiated air rising upwards to the
roof.
The improved ventilator of which a modification is illustrated in vertical section
and sectional plan in Figures 1 and 2 of the accompanying Drawings, is formed by
a series of cylindrical or slightly tapered tubes T of different diameters, which are
fitted concentrically round and above the gas pendent or pendents P. The central
tube T extends down a considerable distance from the roof or other outlet, the tube
surrounding it a less distance, the succeeding tube still less, and so on, so that, the
tubes, which are by preference slightly expanded near the rim or mouth, appear
like an inverted cone.
The upper ends of the tubes terminate in an opening or cone O passing into the
roof, and communicating with an exhausting tube which is carried up to a
higher level or through the roof. The upward draught through the ventilating
and concentric tubes creates an upward current of the heated air, and waste
products from the gas burning underneath and of the vitiated air in the building
which converges towards the series of tubes, and the whole passes through the
ventilating tubes and through the roof to the outer air.
Instead of being formed from a series of tubes the improved ventilator may be
made from a sheet of metal coiled in the form of a volute or spiral, or the tubes
instead of being cylindrical in section may be of square or other section.
The improved construction of ventilator has the advantage that shadows of any
part of it are not cast on the roof, and the burners may be fitted at a lower level
than usual.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what
I claim is
A ventilator formed by a series of concentric tubes arranged so that each
successive tube of the series is of larger diameter, and is shorter than the inner
tubes, substantially as herein described.
Dated this 98th dew of August 1995