Year: 1887

page_text: Date of Application, 27th Oct., 1887
Complete Specification Left, 27th July, 1888
Complete Specification Accepted, 31st Aug., 1888
I, HENRY JOHN ALEXANDER, of 9 The Limes Villas, West Hill Road, Wandsworth,
Surrey, Manager do hereby declare the nature of this invention to be as follows:-
The object of this invention is to construct or arrange a ventilator with a series of
walls or partitions of doule curved form in cross section such partition being arranged
with a top and bottom plate through the upper of which is a hole for leading part of the
uprising gases or vapour to a space under a conical hood, the lower edges of which
overlap and leave openings over the top edges of deflecting plates which shield the
openings that exist between the partitions, said shields are curved to direct the wind
into the hollows of the curved partitions, so that the draught of air blows across the
openings between said partitions, these openings being in direct communication with
the central portion of the ventilator.
The ventilator may be of square rectangular or other shape.
H. GARDNER,
166, Fleet Street, London,
Agent for the said H. J. Alexander.

page_text: I, HENRY JOHN ALEXANDER, of 9 The Limes Villas, West Hill Road, Wandsworth,
Surrey, Manager, 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 a novel arrangement of parts and constitutes a ventilator
for shafts, drain and soil pipes, roofs and the like.
For the purpose of my invention, I construct the ventilator with a series of walls or
partitions A, A, of double curved form in cross section as at Figure 1 of the annexed
drawings, such partitions A, A, being arranged with top and bottom plates B, C,
through the upper of which, (see sectional elevation Figure 2,) is a hole or tube D for
leading part of the uprising gases, vitiated air, or vapour to a space E under a conical
hood F, the lower edges G of which (ornamental or plain) overlap, and leave openings
over the top edges of deflecting plates H, H, which shield the openings 1, 1, that exist
between the partitions A. A said shields H, H, have vertical outwardly curved edges,
as seen at Figure 1, to direct the wind into the hollows of the curved partitions A, A,
so that the draught of air blows across the openings I, 1, between said partitions A, A,
these openings being in direct communication with the central portion J of the
ventilator.
The ventilator may be of square, rectangular, or other shape.
The upper opening or tube D in the top plate B is of smaller area than that of the
bottom plate and its stack tube K, in order that full play of the wind may take
place through the ventilator from the side openings and between the shields H, H, and
the curved partitions A, A.
The outward curved edges of the partitions A, A, prevent the wind, when blowing
across the openings I, I, from entering them, consequently a powerful yet gentle, and
positive updraught or siphonic action is created within the apparatus, (exhaust
pressure in the upcast), the wind and vitiated air or gases passing away, without
hinderance, by the direction given to them through the curvation of A the apex a and
of the outwardly spread edges of H, H.
This ventilator can be made of various external designs, to meet the exigencies of
different styles of buildings, but is of uniform principle in every case, and is adapted
for air tubes, and soil pipes of every size, and particularly to roofs of all descriptions,

page_text: turrets, gables, &c. for the circulation of fresh air in churches, chapels, balls, for large
and small rooms, and for ships' cabins.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed I declare that what I claim is :-
A ventilator with double curved winged partitions A, A, curved shields H, small
opening or tube D, combined or arranged as shown in the annexed drawings.
The 27th day of July 1888.
H. GARDNER,
166, Fleet Street, London,
Agent for the said Henry John Alexander.