Year: 1885

page_text: I, WILLIAM MOHAFFIE of 13 Margaret Street Glasgow in the County of Lanark,
Manufacturing Tinsmith, do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in uptake ventilators and smoke cowls
and the apparatus constituting the invention consists of a shaft or pipe at the
upper end. of which a series of conic frusta is secured. The lower frustum is
placed with the base uppermost to which. base, the base of another frustum is
connected.. Above this second frustum. another and similar frustum is situated
with an annular space between it and the last mentioned frustum which space is
divided, by ribs. (running the entire depth of the space) into segments. Above the
last referred to frustum another conical ring or frustum is placed base downwards
and supported in position by columns. Above this ring the head of the ventilator
or cowl projects it being also formed of a cone, base downwards, and with a frusto-
conical part projecting from its base to within the conical ring last mentioned, an
annular space being left between the head and the said conical ring...
The effect of the arrangement hereinbefore described is, that in" which ever
direction the wind acts upon the ventilator or cowl an inducing current or up.
draught is produced.
Dated thin Thistenth doct
10OF

page_text: COMPLETE SPECIFICATION,
Improvements in Uptake Ventilators and Smoke Cowls.
I, WILLIAM MCHAFFIE, of 13 Margaret Street, Glasgow, in the County of Lanark;
Manufacturing Tinsmith, 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:-
This invention relates to improvements in uptake ventilators and smoke cowls
and as shewn by the several figures on the sheet of drawings hereunto annexed the
apparatus constituting the Invention consists of a vertical shaft or pipe a, at and
above whose upper end a series of conic frusta is secured, the lower frustum d
being placed with its base uppermost and having a second frustum e, projecting
upwards from it.
Above this second frustum e, another and similar frustum f is situated, an
annular space being formed between them which space is divided by vertical ribs
or partitions g, into three, four or other desired number of sections the said ribs
or partitions also serving as supports for the frustum f. Above the frustum f
another conical ring or frustum h placed base downwards is supported by columns
or rods i as indicated by figures 1 and 3 the head.; of the ventilator or cowl, which
is also conical, projecting above the said frustum or ring the base of the head being
lower than and within the upper edge of the ring h to which it is connected by the
supports. The effect of the arrangement hereinbefore described is that in which-
ever direction the wind acts upon the ventilator or cowl an inducing action or up
draught through the shaft or pipe a is produced as indicated by the arrows on
figures 2, 4 and 5 of the drawings. The construction of the apparatus prevents the
admission of rain or snow to the interior of the pipe a.
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
In an uptake ventilator or cowl a series of conic frusta arranged and combined
substantially as hereinbefore described with reference to the drawings annexed.
"Dated this BlLALDI
1000