IMPROVEMENTS IN VENTILATORS be as follows:
Year: 1884

page_text: We ROBERT POLLOCK, and THOMAS HOPKIRK HERBERTSON, of 5 Middle Row
Aldersgate Street, London, in the County of Middlesex do hereby declare the
nature of Robert Pollock's Invention for "IMPROVEMENTS IN VENTILATORS
be as follows:-
"
to
The object of this Invention is to obtain the more efficient ventilation of
buildings, chimney stacks, and ships by means of ventilators without mechanical
motion, constructed in such a manner that rain water cannot be driven into the
extraction shaft, and consists in forming the ventilator with a series of deflectors
arranged vertically, one series of deflectors being placed immediately opposite the
openings of the next series of deflectors. By this means the wind does not directly
act on the extraction shaft or tube, so that in whatever way the wind is blowing
down draught in the extraction tube will be prevented by the deflectors.

page_text: We ROBERT POLLOCK, and THOMAS HOPKIRK HERBERTSON of 5 Middle Row,
Aldersgate Street, London in the County of Middlesex, Engineers do hereby
declare the nature of Robert Pollock's 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:-
The object of this Invention is to obtain the more efficient ventilation of
buildings, chimney stacks, and ships by means of ventilators without mechanical
motion constructed in such a manner that rain-water cannot be driven into the
extraction shaft, and consists in forming the ventilator with a series of deflectors
arranged vertically one series of deflectors being placed immediately opposite the
openings of the next series of deflectors. By this arrangement the wind does not
directly act on the extraction shaft or tube, so that in whatever way the wind is
blowing down draught in the extraction tube will be prevented by the deflectors.
In the annexed Drawings Figure 1 is a sectional plan of Figure z, through the
line x, y. The ventilators may be manufactured of galvanised sheet iron, zinc or
other metal, soldered riveted or otherwise fastened together, and may be made of a
circular, rectangular or other convenient shape. Figure 1, shews ventilator of
circular form, consisting of four vertical deflectors in a circle. More deflectors may
be used should the shape of the ventilator require it.
The outer circle A, represents the floor of the ventilator to which the vertical
deflectors B, and C, are fixed, the series C, being fitted opposite the openings in the
series B, and being strengthened at the outer edges by stripes of metal C¹; the tops
of the deflectors being attached to a plate D. E indicates the extracting shaft or
tube connecting the ventilator with interior of the building.
The wind impinging on the deflectors in any direction on passing through the
openings E, by creating a partial vacuum in the extraction shaft E, extracting
the air from below, and consequently more effectually ventilating the building.
Figure 3. gives an elevation of the ventilator.
Figure 4. shews on a sectional plan a variety of forms in which the deflectors
can be made. The effect is substantially the same whether the ventilator be
constructed with angular, curved or straight vertical deflectors.
We have to state that we do not confine ourselves to the precise details above
described, as these may be varied without altering in any way the characteristic
principle of the said Invention.
Having now particularly described and ascertained the nature of the said
Invention and in what manner the same is to be performed, we declare that what
we claim is :-
The construction of ventilators with deflecting plates arranged vertically as
hereinbefore described, and illustrated by accompanying Drawings.
·ו. ת
·
1
ст
1001
ROBERT POLLOCK.
THOB, H. HERBERTSON.