draught and Inducing Up-draught for Chimneys, Ventilators, and other similar Purposes.
Year: 1884

page_text: draught and Inducing Up-draught for Chimneys, Ventilators,
and other similar Purposes.
We, EDWIN VERITY and JOSHUA MARLAND VERITY, of Call Lane Leeds, in the
County of York, Ironmongers do hereby declare the nature of our said Invention
for "AN IMPROVED TERMINAL' OR APPLIANCE FOR PREVENTING DOWN-DRAUGHT
AND INDUCING UP-DRAUGHT, FOR CHIMNEYS, VENTILATORS, AND OTHER SIMILAR
PURPOSES," to be as follows:-.
The nature or special feature of this Invention consists in causing the wind or
air-current which bears upon the "Terminal" or appliance, externally, to take a
spiral or twisting direction round it, and this in such a manner as to create
a similar or sympathetic effect, in or upon the interior, and thus not only prevent
down-draught," but also give increased inducement or force to the internal
upward current, as hereinafter explained.
"
In carrying our Invention into effect, we prefer to adopt a cylindrical or pipe-
like arrangement or contour for the general form or outline, and we construct this
with a number of spiral trough-like flutes or hollow grooves, externally, parallel
with each other, and having open spaces or through nicks between them, about
three quarters of an inch wide, and also both parallel and spiral;—that is,-
-so that
the entire circumference shall consist of spiral hollow grooves and narrow openings,
the latter being about one third the width of the former, and both of them being
"twisted or made spiral at such an angle or "pitch" as to complete the circle, or
traverse the circumference, (spirally) of a ten inch diameter pipe or appliance, in a
length of about three feet.
"
We prefer generally to construct the foregoing in sections or lengths of about
eighteen inches each, and this in such a manner that the joint which unites them
shall form a kind of tenon and socket, and at the same time shall not intercept or
break the continuity of the before-described spiral grooves and open spaces, which,
in most cases, we continue from the upright or parallel part, to and along the top
CD 071

page_text: or "cap," to the central ornament; although, in some cases we terminate the spiral
flutes and openings of the parallel part of the appliance, at or immediately under
a " cornice or other suitable termination to that part; and in such case, we some-
times omit the openings only, in the cap or top, continuing the flutes or other
ornamentation without them.
It will be understood that our object in constructing our Invention in short
sections, is two-fold,-namely,-for the facility or convenience of manufacture and
of fixing; and we prefer to adopt this system or arrangement, whether it may be
constructed of Metal, Fire clay, Terra-Cotta, or other desirable or convenient
material.

page_text: πριονα
тотипцат or Appliance for Preventing Down-
draught and Inducing Up-draughts for Chimneys, Ventilators,
and other similar Purposes..
We EDWIN VERITY and JOSHUA MARLAND VERITY of Call Lane, Leeds, in the
County of York, Ironmongers, do hereby declare the nature of our said Invention
for "AN IMPROVED TERMINAL OR APPLIANCE FOR PREVENTING DOWN-DRAUGHT
AND INDUCING UP-DRAUGHT FOR CHIMNEYS, VENTILATORS, AND OTHER SIMILAR
PURPOSES," and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:—
The nature or special feature of this invention consists in causing the wind or
air-current which bears upon the Terminal' or appliance, externally, to take a
spiral or twisting direction round it, and this in such a manner as to create
a similar or sympathetic effect, in to or upon the air & coming or arising from the
interior, and thus not only prevent "down-draught," but also give increased
inducement or force to the internal upward current, as hereinafter explained.
In carrying our invention into effect, we prefer to adopt a cylindrical or pipe-
like arrangement or contour for the general form or outline, and we construct this
with a number of spiral trough like flutes or hollow grooves, externally, parallel with
each other, and having open spaces or slots between the fluted portions, about three
quarters of an inch wide (more or less) and also both parallel or spiral; that is, so
that the entire circumference shall consist of spiral hollow grooves and narrow slots
or openings; the latter being about one third the width of the former (more or
less) and both of them being (preferably) "twisted or spiral at such an angle or
'pitch as to complete the circle, or traverse the circumference, (spirally) of a ten
inch diameter pipe or appliance, in a length of about three feet.
"
"
"
<
We prefer generally to construct the foregoing in sections or lengths of about
eighteen inches each, and this in such a manner that the joint which unites them
shall form a kind of Tenon and Socket, and at the same. time shall not intercept or
break the continuity of the before described spiral grooves, which, in most cases,
we continue from the upright or parallel part, to and along the top or cap," to
the central ornament; although, in some cases we terminate the spiral flutes and
openings of the parallel part of the appliance, at or immediately under a " cornice "
or other suitable termination to that part; and in such case, we sometimes omit
the openings only, in the cap or top, continuing the flutes or other ornamentation
without them.
It will be understood that our object in constructing our invention in short
sections, is two-fold,-namely-for the facility or convenience of manufacture and
of fixing; and we prefer to adopt this system or arrangement, whether it may
be constructed of metal, fire-clay, terra cotta, or other desirable material.
And in order that our said invention may be particularly described and ascer-
tained, reference is hereby made to the accompanying drawings, in which similar
letters of reference indicate corresponding parts.
Fig. 1 is a perspective view of our invention as usually fixed to chimnies and
flues, and Fig. 2 is a sectional elevation of the lower portion of the same,
The

page_text: terminal is shown in Fig. 1 in 3 pieces, the upper end being preferably conical, as
shown. a a and b b are the junctions of the three parts. cc are the spiral
openings, or slots, usually about three quarters of an inch in width. dd are the
The
spiral grooves, which cause induced currents of air to follow their course.
slots terminate at some distance from each end of the several parts, in order to
unite the spiral portions in one structure. Intermediate uniting pieces are some-
times added for strengthening the terminal.
In some cases one portion only is erected, in others two, three, or any other
number of pieces may be united and built up, and with or without the conical top.
We do not confine ourselves to any particular diameter, or angle of spiral, as the
saine may be varied to suit the particular purpose to which it is to be applied, and
the material of which it is constructed may be likewise varied.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is
The manufacture and use of terminals constructed with spiral grooves and open
slots parallel thereto, substantially as and for the purposes hereinbefore described
and shewn on the drawings.